FILM BOILING HEAT TRANSFER ON A HIGH TEMPERATURE SPHERE IN NANOFLUID
|
|
- Charles Wilkins
- 5 years ago
- Views:
Transcription
1 Proceedings of HT-FED ASME Heat Transfer/Fluids Engineering Summer Conference July 11-15, 004, Charlotte, North Carolina USA HT-FED FILM BOILING HEAT TRANSFER ON A HIGH TEMPERATURE SPHERE IN NANOFLUID HYUN SUN PARK, DEREJE SHIFERAW, BAL RAJ SEHGAL Department of Energy Technology Royal Institute of Technology Stockholm, SE-10044, Sweden ( ) sun@energy.kth.se, dereje@energy.kth.se, bsehgal@egi.kth.se DO KYUNG KIM AND MAMOUN MUHAMMED Department of Material Chemistry Royal Institute of Technology Stockholm, SE-10044, Sweden ( ) kyung@matchem.kth.se, mamoun@metchem.kth.se ABSTRACT Quenching experiments of a high temperature sphere in Al nanofluids are conducted to investigate the characteristics of film boiling and compared to those in pure water tests. One stainless steel sphere of 10 mm in diameter at the initial temperatures of 1000~1400 K was tested in the nanofluids of the volume concentrations from 5 to 0 % and the degrees of subcooling from 0 to 80 K. The test results show that film boiling heat fluxes and heat transfer rates in nanofluids were lower than those in pure water. The differences of the film boiling heat transfer rates between pure water and nanofluids become larger when the liquid subcooling decreases. Those results suggest that the presence of nanoparticles in liquid enhances vaporization process during the film boiling. The effects of nanoparticle concentrations of more than 5 vol. % on film boiling appear to be insignificant. However, the minimum heat fluxes tend to decrease when the concentration increases. Direct quenching without film boiling was repeatedly observed when an unwashed sphere was employed for quenching tests in nanofluids. It suggests that nanoparticle deposition on the sphere surface prevents the sphere from forming film around the sphere, which consequently promotes the rapid quenching of the hot sphere. Bi Biot number [=hl C /k] C Coefficient in Film Boiling Correlations C Micyoshi Coefficient in Micyoshi Film Boiling Correlation Cp Heat Capacity D Diameter I.D. Inner Diameter g Gravitational Acceleration h Heat Transfer Coefficient h fg Heat of Vaporization k Thermal conductivity L C Characteristic Length m Mass NF Nanofluid Nu Nusselt Number [=hd/k] O.D. Outer Diameter Pr Prandtl Number [=Cpµ/k] q " Heat Flux R Radius T Temperature t time Wall Superheat (=T w T sat ) T sub Liquid Subcooling (=T sat T l ) Vol% Volume Percentage Greek NOMENCLATURE µ Viscosity Ar Archimides Number [=g(ρ l -ρ v )D 3 /(ρ v ν v )] ν Kinematic Viscosity Address all correspondence to this author. Phone: ; fax ; sun@energy.kth.se. 1 Copyright 004 by ASME
2 ρ σ Density Surface Tension Subscripts film Film Boiling l Liquid MFB Minimum Film Boiling NF Nanofluid rad Radiation S Sphere sat Saturation sub Subcooling v Vapor w Wall INTRODUCTION Suspension of micrometer or millimeter sized particles in fluids has been reported to have enhancement effect in heat transfer. Unfortunately the industrial application of the particle suspension technology was limited by problems associated with erosion, rapid settlement, clogging and pressure drop due to the presence of particles in fluids. The recent development in material technology enables to produce particles in nanoscale. Suspension of nanoparticles, or solid particles with sizes less than 100nm, exhibit better properties than those of conventional micro or larger sized particles, which provide less erosion, stable and long suspension and negligible extra pressure loss. Recently, U. S. Choi at Argonne National Laboratories in USA [1] found that so-called nanofluid, or a liquid solution uniformly mixed with small concentrations of nanoparticles, enhanced the fluid thermal conductivity up to 40 % with small amount of nanoparticle suspension []. Since then, increasing number of research is currently underway to understand the heat transfer characteristics of nanofluids. Initial effort was dedicated to investigate the single-phase convection heat transfer (CHT) of nanofluids [3][4][5] motivated by this remarkable enhancement of thermal conductivity of nanofluids with very low concentration (<10% in volume). Their results showed that the convective heat transfer enhanced with a low concentration of nanoparticles in liquids [5]. The main reasons for the CHT enhancement are reportedly believed that: (a) the increase of the surface area, the heat capacity and the effective thermal conductivities of the fluid due to the suspended nanoparticles, (b) the intensification of interaction and collision among the particles, fluid and the flow passage surface, (c) the enhancement of mixing fluctuation and turbulence of the fluid, and (d) the flattening of the transverse temperature gradient of the fluid due to the dispersion of nanoparticles. Very recently, the investigation on the heat transfer characteristics of nanofluids has been extended to the boiling heat transfer (BHT) regime. Up to the present as far as the authors knowledge, only two studies were reported for the BHT in nanofluids. Their studies were conducted in a poolboiling configuration. First Das et al. [6] performed their pool boiling experiments with a 0 mm cylindrical cartridge heater in a nanofluid, in which alumina nanoparticles with an average size of 38nm were suspended in pure water and investigated the nucleate boiling characteristics in terms of a volume concentration of up to 4%. They observed that the nucleate BHT was deteriorated due to the deposition of nanoparticles on the heated surface, which changed the surface characteristics due to the particle trapping on the surface. Unfortunately thus, this work provided the limited explanation on the exclusive capability of nucleate BHT of the nanofluid. Second, Vassallo et al. [7] performed the pool boiling experiments with a 0.4 mm diameter NiCr wire in 15 and 50 nm silica nanofluids. They reported that the maximum heat flux without the wire failure achieved remarkably up to about 3 times higher than in pure water. Heat flux at the wall superheat where the critical heat flux occurs in pure water becomes about 60% higher. However, no significant enhancement was observed in nucleate boiling regime. The stable film boiling at temperature closed to the wire melting temperature was achieved without wire failure. They also reported that the wire was coated with 0 to 50 µm thick silica observed after the experiments. Both works imply that the practical application of nanofluids for the boiling applications still faces with a problem of the particle deposition on the heated surface. However, there is a noticeable result on critical heat flux enhancement. As can be seen, the current understanding of the boiling process in nanofluid is in a primitive stage and requires more theoretical and experimental works are needed to evaluate the BHT characteristics of the nanofluids. The present study is motivated by the lack of investigation on film BHT in nanofluid, which will provide an data set to construct a preliminary pool boiling curve of nanofluids in full ranges of heat transfer regimes. The work is carried out to investigate the film boiling heat transfer characteristics of nanofluid during the quenching process of a high temperature spherical ball in a nanofluid, or aluminum-oxide nanoparticles with small volume concentration in pure water. Transient cooldown quenching experiment was chosen by two reasons: first to investigate the quenching ability of nanofluids by observing the entire transient quenching boiling processes from film boiling to natural convection heat transfers and second to minimize nanoparticle deposition on the heated surface due to the immediate vapor formation during the boiling process, which enables exclusively to investigate the BHT capability of nanofluids. For the comparison with the previous experimental results in the CHT and BHT, the similar size, concentration and material of the nanoparticles are chosen as, mostly 5 volume percent, about 30 nm and Al nanoparticles, respectively. In this paper, the experimental results of the initial film boiling process during the entire quenching process of a sphere are described. The effects of the nanoparticle concentration, nanofluid subcooling, nanoparticle deposition on the sphere Copyright 004 by ASME
3 during film boiling heat transfer are investigated and compared with the film boiling characteristics in pure water. EXPERIMENTAL Experimental set-up Figure 1 shows the schematic of the quenching boiling test facility. The experimental setup consists of a 10 mm stainless steel ball, a RF induction furnace, a test chamber which contains de-ionized distilled water or nanofluids. The sphere is drilled, as shown in Fig. 1, to install a 0.5 mm O.D. K-type thermocouple supported by a 0.9 mm O.D stainless tube at the center of the sphere. The thermocouple support to sphere diameter ratio should be minimized to reduce the heat loss through the support. In the present experiments, the ratio is 0.09 (the corresponding area ratios is 0. %) which is smaller than other previous experiments (mostly larger than 0.15) [8][9][10] [11]. The induction furnace consists of a RF induction power supply (HeatTek GT-6) with a peak induction power of 6 kw at nominal frequency of 100 khz and a 4 turns of 6 mm O.D copper tube coil with an inner coil diameter of 50 mm. The sphere is normally heated at maximum 1100 ºC in the induction coil to ensure the formation of steady film boiling during the cool-down transients. The test chamber is a 100x100 mm rectangular Lexan chamber with a height of 150 mm. The surface of liquid in the chamber is 70 mm below the initial position of the sphere inside the induction coil. The final location of the sphere in the chamber is 50 mm below the liquid surface. The pneumatic cylinder delivers the sphere from the furnace to the chamber at a near constant speed of 1m/s, which corresponds to about 10 ms travel time. A data acquisition system (HP SCXI-110) records transient temperatures of the heated sphere at the center and of the liquid inside the test chamber at the sampling rate of 50 Hz. The measured temperatures data are smoothed to 100 Hz sampling rate by the adjacent averaging technique to reduce the measurement noise. A piezoelectric pressure transducer (PCB Piezotronics 10A04) is flush-mounted on the center of a test section wall to measure the acoustic pressure signals produced during the vapor film collapse. However, the pressure measurement was not successful during the present tests reported in this paper. The experiments employed a normal camcorder or high-speed camera to visualize the quenching boiling phenomena in the case of the water tests. Unfortunately, the milky-colored nanofluids even with 5 vol. % are not transparent to visualize the boiling phenomena on the sphere during the tests. (a) Population (%) Figure 1. The schematics of the quenching boiling test facility Particle size (nm) (b) FIG.. Figure. Transmission electron microscopy (TEM) image (a) and size histogram (b) of Al nanoparticles in nanofluids. Preparation of Nanofluid 3 Copyright 004 by ASME
4 Nanofluid was prepared by the dispersion of nano size Al particle powders into de-ionized, distilled water using an ultrasonic vibrator. Figure shows a TEM (Transmission Electron Microscopy) image for the Al nanoparticles and the corresponding particle size distribution used in the present tests. The average particle size and size distribution were obtained from the TEM images for the samples using an image analysis program by measuring the diameters of at least 500 particles. Perfectly spherical Al nanoparticles with an average diameter of 33.1 nm were found. In this study, the Al nanoparticle was chosen because the majority of the previous works on heat transfer in nanofluids were carried out employing this nanoparticle. The nanofluids with the 5, 10, 0 volume percent of the nanoparticles were tested at various nanofluid temperatures ranged from 0~70 o C. Most tests were performed with the 5 volume percent nanofluid. However, higher concentrations of nanoparticles (10 and 0 % in volume) in nanofluids were also tested since we presumed that the number of nanoparticles in nanofluid might play an important role on quenching boiling process of the sphere. In prior to the nanofluid tests, a series of pure water tests was conducted at different thermal conditions to confirm the test facility and eventually to compare with the nanofluid tests. Pre-test with Pure Water In prior to the nanofluids tests, a series of quenching tests was performed in pure water and the results were compared with existing film boiling correlations. These tests provided the pure water data for the comparison as well as verified the procedures and post-analysis of the experiments. For the comparison of film boiling heat transfer rates between the pure water and nanofluids, a set of the pure water tests was perform to evaluate the existing film boiling correlation developed by the previous investigators such as Michyoshi [8], Sakurai [9], Dhir [10], Siviour [11] and Liu [11]. It was found that the Michyoshi correlation as shown in Eqs. 1 and agreed well with our pure water experimental data showing agreement within ±18% [13] since the Michyoshi correlation well employed the effect of liquid subcooling and most of our experimental data were obtained in the highly subcooled conditions. This comparison verifies that the present pure water tests for the film boiling represents the general film boiling behavior. 1 4 Ar 1 4 film = C M c Nu Sp where C=C Micyosh =0.696 for pure water and (1) 4 B = Sc B A B Sc * α +, E = A + α * 3 1 * 1 A = Sc + β Sp Prl Sc + β Sp Prl, * + Sp Pr * l Sc Sp Prl β + Sp Prl + 1 α = β Sp Prl, ( µρ) β ( µρ ) l υ * pl =, Sc * fg 7 Sc C Tsub =, h * 1 = hfg + Cpv Tsat, Sp Cp ( * v Tsat h Prυ ) fg = h fg RESULTS AND DISCUSSION Quenching of the high temperature sphere Figure 3 shows a typical image of the sphere in highly subcooled pure water during film boiling. The film boiling starts immediately after the sphere immerged into subcooled liquid. The image shows the optically deformed sphere due to the vapor film outside the sphere. The actual sphere is also indistinctly shown in the image. Very thin (order of 100 micrometers or less) vapor film covered the sphere during the film boiling in highly subcooled pure water. The image showed the thickness of the vapor film increases along the sphere surface from the stagnant point. The vapor dome above the separation point of vapor film around the sphere is also shown in the images. It is shown that the shape of the vapor dome at the position of thermocouple and its supporting structures is slightly deformed due to the heat loss through the structural materials. However, this heat loss was not significant to influence on the overall quenching process of the heated sphere. Figure 4 shows the center temperatures of the heated sphere in pure water and nanofluids with different volume Support Sphere (optically deformed) Sphere (actual) β * 3 M c 3 E = E 1 + Sp Prl ( β Pr Sp ) l () Vapor Pure Water Figure 3. The image of the 10mm heated sphere during film boiling in pure water at the liquid subcooling of 70~81 K. 4 Copyright 004 by ASME
5 concentrations during the transient cool-down process. For typical quenching behavior in highly subcooled pure water at 0 o C, a washed or clean sphere at initially 1063 o C quenched rapidly to about 1000 o C due to the direct contact between the high temperature sphere and the highly subcooled water and subsequently in the film-boiling regime. The vapor film around the sphere abruptly collapsed at approximately 360 o C and produced a high acoustic noise. Thereafter the quenching boiling mode of the sphere turned from the film boiling to the transition boiling, in where the sphere temperature rapidly decreases. Finally single-phase natural convection heat transfer takes over the quenching process after experiencing through the maximum heat flux and nucleate boiling regions. In the Al nanofluids, the quenching behavior of the same sphere was similar to the pure water case, clearly showing the various boiling modes as indicated in Figure 4. For the highly subcooled nanofluids, the center temperatures of sphere in the nanofluids were slightly higher than that in the pure water, which indicated lower heat transfer rates. Center Temerature of Sphere ( o C) Direct contact Boiling Film Boiling Region 10% Al = 70 K Unwashed Spheres Transition Boiling Region Distilled = 80 K Washed Sphere Nucleate Boiling Natural Convection Region 0% Al = 70 K Washed Sphere 10% Al = 70 K Washed Sphere 5% Al = 76 K Washed Sphere Time (s) Figure 4. Temperature profiles at the center of a 10 mm diameter sphere in pure water and Al nanofluids at the liquid subcooling of about 70~80 K. Effect of nanoparticle deposition on sphere surface In the quenching tests with fresh or washed spheres at about 1000 o C, film boiling was consistently observed. On the other hand, tests with unwashed spheres (spheres used in the tests with nanofluids) repeatedly showed no film boiling at the same experimental conditions during quenching process. The unwashed spheres quenched more rapidly through the transition boiling bypassing the film-boiling mode. These temperature histories at the sphere center are shown in Figure 4. It is clear that this change in quenching was resulted from the presence of residue of nanofluids on the sphere surface. It is noted that the cleaning procedure of the sphere was rather simply; only applying a relatively high-speed pure water jet on the sphere surface. This indicates that the nanoparticles on the surface of the sphere were loosely attached. Probably the thickness of the loosely accumulated nanoparticles on the sphere surface becomes sufficiently large to destabilize the very thin vapor film at highly subcooled liquid and thus to prevent stable vapor film formation. This observation suggests that the rapid quenching of the heated sphere can be achieved by avoiding the formation of film boiling when the surface is prewetted with low concentration nanofluids. In all tests presented in this paper, however, the fresh or washed spheres were used not only to ensure the formation of film boiling during the quenching but also to exclude the effect of the nanoparticle deposition on the quenching process. Film boiling heat fluxes To evaluate the heat transfer rates during the quenching process of the sphere, the surface heat flux on the sphere should be obtained. More often, the task of converting the measured transient center temperature to the surface temperature and corresponding surface heat flux can be simplified by assuming constant temperature through out the material, if the Biot number, Bi, or the ratio of internal (conductive) to external (convective) resistances to heat transfer less than 0.. For a sphere of radius R, the lumped sphere Biot number becomes LC h hr Bis = = < 0.. (3) k 3k The simple energy balance, assuming constant thermophysical properties, can obtain the total surface heat flux, which is split into the film boiling heat flux and the radiation heat flux, mscp dt q s = qs + J q measured film s = rad (4) πd dt where q s, rad =εσ(t s 4 - T sat 4 ), ε=0.6 for the moderately oxidized stainless steel sphere [11] and the radiation factor J is 7/8 for sphere from Bromley at al. [14]. For the evaluation of film boiling heat transfer, the film boiling heat flux was obtained by subtracting radiation contribution from the total surface heat flux. The lumped parameter assumption is valid for the present tests for the film boiling since the Biot numbers during the film boiling are less than 0.1 for the low liquid subcooling and less than 0. for the high liquid subcooling when the surface superheat of the sphere is larger than 300 K. However other boiling heat transfer modes like direct-contact boiling, transition boiling, nucleate boiling etc., in where the heat transfer coefficients are considerably large, the inverse heat transfer analysis should be conducted to predict the accurate surface heat flux and temperature 5 Copyright 004 by ASME
6 In Figure 5(a), the measured film boiling heat fluxes in nanofluids with different concentration are plotted together with those in pure water at highly subcooled conditions. The heat fluxes range from 0.1 MW/m at the sphere wall superheat of 50 K to 0.31 MW/m at the sphere super heat of 800 K. It shows that the heat fluxes in nanofluids are slightly lower than those in pure water. The difference of the heat fluxes between the nanofluids and the pure water increases when the sphere wall superheat decreases water becomes larger. Similarly it shows larger difference of the heat fluxes at the lower sphere superheat. Initially we postulated that individual nanoparticles or a cluster of nanoparticles in the vapor-liquid interface promote the vaporization during the film boiling. Therefore beside the 5% concentration of nanoparticles which was normally used in other studies, two more concentrations of nanoparticles in pure water, i.e., 10 and 0 % were tested. As shown in Figure 5, however, no noticeable effect of the volume concentration of nanoparticles on the film boiling heat flux at the high and low liquid subcooling cases was observed. q" film, MW/m High Subcooling 0.6 =76K 10% 0.4 0% =75K =80K 0. =81K =81K =80K , K q" MFB, kw/m Distilled =70~81K 5%, Al =76K 10%, Al 0%, Al (a) Concentration, % q" film, MW/m Low Subcooling =31K 0.14 =31K =3K =3K , K (b) Figure 5. Film boiling heat fluxes of a 10 mm diameter sphere in pure water and nanofluids at (a) high liquid subcooling of about 70~80 K and (b) low liquid subcooling of about 30 K. The film boiling heat fluxes of the nanofluids and the pure water at low subcooling are shown in Figure 5(b). The film boiling heat fluxes in the nanofluids covers from 0.3 MW/m at = 900 K down to 0.1 MW/m at = 40 K. Comparing to the highly subcooled case, the difference of the film boiling heat fluxes between the nanofluid and the pure Figure 6. Minimum film boiling heat fluxes in pure water and Al nanofluids with different concentration. The minimum film boiling heat fluxes in pure water and nanofluids with different concentration at the liquid subcooling of 70~80K are shown in Figure 6. The minimum film boiling heat flux in pure water at the subcooling of 70~80K ranges from 190 to 40 kw/m. In the nanofluids at 70 K subcooling the heat flux shows in the ranges from 150 to 180 kw/m. However, the minimum film boiling heat fluxes at highly subcooled liquids tends to decrease as the nanoparticle concentration increases. Film boiling heat transfer coefficients From the heat flux data, the film boiling Nusselt number was evaluated and shown in Figure 7. In this figure, Nusselt numbers of pure water and nanofluids with different concentration for film boiling in high and low subcooling liquids respectively are compared with various correlations for pure water. The Nusselt numbers for the film boiling were obtained by the subtraction of the Nusselt number for the radiation heat transfer from the total Nusselt numbers measured. 6 Copyright 004 by ASME
7 It is clearly shown that the film boiling Nusselt numbers for nanofluids were lower than those for pure water. For the liquid subcooling of 70~80K the film boiling Nusselt numbers in nanofluids vary from about 50 to 30 for the sphere wall superheat from 85K down to 50K, respectively. For the low nanofluid subcooling of 30K, the Nusselt numbers decrease to the range of 40 to 80 for the wall superheat from near 900K down to 400K. The differences between the Nusselt numbers of the pure water and nanofluids for low subcooled film boiling are larger than those for highly subcooled film boiling. Nu film Nu film (K) (a) =76K 10% 0% =80K =80K Nu Michyosi ( Nu Liu ( Nu Sakurai ( Nu Dhir ( Nu Savior (Water, T sub (K) (b) =31K =31K =3K =3K Nu Michyosi ( Nu Liu ( Nu Sakurai ( Nu Dhir ( Nu Savior (Water, T sub Figure 7. Film boiling heat transfer for a 10 mm diameter stainless steel sphere in pure water and nanofluids of different concentrations at (a) high liquid subcooling of 70~80 K and (b) low liquid subcooling of 30 K. Figure 8 shows the data comparison obtained from the pure water and nanofluid tests with the Michyoshi correlation as shown in Eqs. 1 and. The correlation coefficient, C Michyoshi, of for our pure water tests as an indicator of heat transfer rate becomes nearly the same value, i.e., 0.695, to the original value of The coefficient became constant with respect to the liquid subcooling, since the effect of liquid subcooling on the film boiling for pure water was separately taken account into the correlation as shown in Eqs. 1 and. For the nanofluids, however, the Michyoshi coefficient tends to be a week function of the subcooling of the nanofluids, showing the higher heat transfer rate at higher liquid subcooling as shown below C 4 NF = T sub 0 (5) with the standard deviation of It may illustrate that the presence of nanoparticles in pure water during the film boiling provides additional effect similar to that of liquid subcooling on the film boiling. It may suggest that the vapor film around the sphere during film boiling becomes stable and possibly thicker in the nanofluids. If this dependency of the coefficient on the liquid subcooling is ignored, the average coefficient for the nanofluids becomes with the standard deviation of 0.08, which is approximately 10% lower than the coefficient for pure water. C Michyoshi =Nu film /(Ar M c /Sp') 1/ Pure water Al Nanofluids =400,500,600,700K C Michyoshi, Water =0.696(Michyoshi) =0.695(Present data) 0.55 C NF = C NF = x10-4 T sub T sub (K) Figure 8. Coefficient of Michyoshi film boiling correlation in pure water and Al nanofluids. It is still unclear whether the nanoparticles with dilute concentration in pure water enhance the vapor generation and consequently thicken the vapor film on the heated sphere to further reduce the heat transfer rates. It can be confirmed if the vapor production rate in the saturated nanofluid can be measured. However, because of the opaqueness of the nanofluid at the concentrations used in this study, the visual quantification of the vapor generation becomes challenging and may require advanced measurement techniques such as X-ray radiography [15]. More experiment at near saturation condition is still underway to conclude the trend of the film boiling behavior in the nanofluids. 7 Copyright 004 by ASME
8 CONCLUSIONS A set of quenching experiments of a heated stainless steel sphere in Al nanofluids are conducted to study film boiling heat transfer by comparing with those in pure water. One sphere of 10 mm in diameter at the initial temperatures of 1000~1400 K was tested in the nanofluids of the volume concentrations from 5 to 0 % and the degrees of subcooling from 0 to 80 K. The following results are obtained: Film boiling heat fluxes and heat transfer coefficients in nanofluids were always lower than those observed in pure water. The differences of the film boiling heat transfer coefficients between pure water and nanofluids become larger as the liquid subcooling decreases. It suggests that the presence of nanoparticles with dilute concentration in subcooled liquid enhances vaporization process as a similar way of the effect of liquid subcooling. The effects of nanoparticle concentrations of more than 5 vol% on film boiling heat transfer appear to be negligible. Direct quenching of the sphere without film boiling in nanofluids was repeatedly observed when an unwashed sphere with nanoparticle deposition was quenched. It suggests that nanoparticle deposition on the sphere surface prevents the sphere from forming stable vapor film around the sphere, which consequently promotes the rapid quenching of the hot sphere. REFERENCES [1] U. S. Choi, Enhancing thermal conductivity of fluids with nanoparticles, American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, 31: , [] J. A. Eastman, S. U. S. Choi, S. Li, W. Yu, and L. J. Thompson, Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles, Applied Physics Letters Vol. 78(6) pp February 599, 001. [3] Xuan, Y., and Roetzel, W., Conceptions for Heat Transfer Correlation of Nanofluids, Int. J. of Heat and Mass Transfer, 43. pp 3701~3707, 000. [4] J.A. Estmann et al., 000, Research Briefs, Argonne National Laboratories, USA. [6] Das, S. K., Putra, N. Roetzel, W., Pool Boiling Characteristics of Nano-fluids, Int. J. of Heat and Mass Transfer, 46, pp 851~86, 003. [7] Vassallo, P., Kumar, P., and D Amico, S., Pool Boiling Heat Transfer Experiments in Silica-Water Nanofluids, Int. J. of Heat and Mass Transfer 47, pp 407~411, 004. [8] Michyoshi, I., Takahashi, O., and Kikuchi, Y., Heat Transfer and the Low Limit of Film Boiling, Proc. Of the First World Conf. On Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Dubrovnik, Yugoslavia, pp 1404~1415, [9] Sakurai, A., Shiotsu, M. And Hata, K., A General Correlation for Pool Film Boiling Heat Transfer From a Hrizontal Cylinder to Subcooled Liquid: Part Experimental Data for Various Liquids and Its Correlation, J. of Heat Transfer, Transactions of ASME, Vol. 11, pp 441~450, May, [10] Dhir, V.K., and Purohit, G.P., Subcooled Film-Boiling Heat Transfer From Spheres, Nuclear Engineering and Design, Vol. 47, pp49~66, (1978). [11] Liu, C., Film Boiling on Spheres in Single- and Two- Phase Flows, Ph.D. Thesis, University of California, Santa Barbara, California, USA, [1] Siviour, J.B. and Ede, A.J., Heat Transfer In Subcooled Pool Film Boiling, Proc. 4 th Int., Heat Transfer Conf. Vol. 5, B 3.1, Paris-Versailles, [13] Shiferaw, D., Quenching Boiling Heat Transfer in Pure Water and Nanofluid, M.S. Thesis, Royal Institute of Technology, Stockholm, Sweden, 004. [14] Bromley, L. A., Leroy, N. R., and Robbers, J. A., Heat Transfer in Forced Convection Film Boiling, Industrial and Engineering Chemistry, Vol. 45, No. 1, pp , [15] Park, H. S., Hansson, R.C., and Sehgal, B.R., Fine Fragmentation of Molten Droplet in Highly Subcooled Water due to Vapor Explosion observed by X-ray Radiography, in print at Experimental Thermal and Fluid Science, 004. [5] Xuan, Y., and Li, Q., Investigation on Convective Heat Transfer and Flow Features of Nanofluids, J. of Heat Transfer, Vol. 15, pp151~155, Copyright 004 by ASME
Experimental study on quenching of a small metal sphere in nanofluids
Experimental study on quenching of a small metal sphere in nanofluids The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation As
More informationEffect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system
Korean J. Chem. Eng., 25(5), 966-971 (2008) SHORT COMMUNICATION Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system Byung-Hee Chun, Hyun Uk Kang, and Sung
More informationCOOLING CHARACTERISTICS OF THE WATER BASED NANOFLUIDS IN QUENCHING
COOLING CHARACTERISTICS OF THE WATER BASED NANOFLUIDS IN QUENCHING Josip Župan, Tomislav Filetin, Darko Landek University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Quenching
More informationConvective heat transfer and flow characteristics of Cu-water nanofluid
Vol. 45 No. 4 SCIENCE IN CHINA (Series E) August 2002 Convective heat transfer and flow characteristics of Cu-water nanofluid LI Qiang XUAN Yimin School of Power Engineering, Nanjing University of Science
More informationExperimental Study of Boiling Crisis Phenomena in Nanofluids
Experimental Study of Boiling Crisis Phenomena in Nanofluids Craig Gerardi Advisors/Contributors: Professor Jacopo Buongiorno Dr. Lin-Wen Hu Dr. In Cheol Bang Massachusetts Institute of Technology, Nuclear
More informationQUENCHING PERFORMANCE IN NANOFLUIDS AND NANOPARTICLES-DEPOSITED SURFACES
QUENCHING PERFORMANCE IN NANOFLUIDS AND NANOPARTICLES-DEPOSITED SURFACES Kyung Mo Kim, In Cheol Bang School of Mechanical and Nuclear Engineering Ulsan National Institute of Science and Technology 50 UNIST-gil,
More informationEXPERIMENTAL STUDY OF SATURATED POOL BOILING HEAT TRANSFER OF I E WATER
EXPERIMENTAL STUDY OF SATURATED POOL BOILING HEAT TRANSFER OF I E WATER CHUNSING WANG Originally published as Physical, Chemical and Biological Properties of Stable Water Clusters, Proceedings of the First
More informationPool Boiling Heat Transfer to Water/Lithium Bromide Mixture
International Conference on Challenges and Opportunities in Mechanical Engineering, Industrial Engineering and Management Studies 548 Pool Boiling Heat Transfer to Water/Lithium Bromide Mixture A. Sathyabhama
More informationAnalysis of Heat Transfer Coefficient of CuO/Water Nanofluid using Double Pipe Heat Exchanger
International Journal of Engineering Research and Technology. ISSN 0974-3154 Volume 6, Number 5 (2013), pp. 675-680 International Research Publication House http://www.irphouse.com Analysis of Heat Transfer
More informationEXPERIMENTAL INVESTIGATION OF RELATIVE PERFORMANCE OF WATER BASED TiO 2 AND ZnO NANOFLUIDS IN A DOUBLE PIPE HEAT EXCHANGER
EXPERIMENTAL INVESTIGATION OF RELATIVE PERFORMANCE OF WATER BASED TiO 2 AND ZnO NANOFLUIDS IN A DOUBLE PIPE HEAT EXCHANGER M. Chandra Sekhara Reddy 1, a, Ramaraju Ramgopal Varma 2,a Veeredhi Vasudeva Rao
More informationEnhancement on the Performance of Refrigeration System Using the Nano-Refrigerant
Journal of Energy and Power Engineering 11 (2017) 237-243 doi: 10.17265/1934-8975/2017.04.004 D DAVID PUBLISHING Enhancement on the Performance of Refrigeration System Using the Nano-Refrigerant Qasim
More informationNanofluid heat transfer enhancement for nuclear reactor applications
Nanofluid heat transfer enhancement for nuclear reactor applications The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation As Published
More informationNumerical method for modelling spray quenching of cylindrical forgings
Modellazione Numerical method for modelling spray quenching of cylindrical forgings M. Soltani, A. Pola, G. M. La Vecchia, M. Modigell Nowadays, in steel industries, spray quenching has been used as a
More informationEHD-ASSISTED CONDENSATION OF REFRIGERANT R-134a ON TUBE BUNDLES
8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 24-26 June 2002, St. Louis, Missouri AIAA 2002-3227 AIAA 2002-3227 EHD-ASSISTED CONDENSATION OF REFRIGERANT R-134a ON TUBE BUNDLES Majid Molki*
More informationUnderstanding Steam Explosion Micro Interactions: Visualization and Analysis
Understanding Steam Explosion Micro Interactions: Visualization and Analysis Roberta C. Hansson School of Engineering Science Department of Physics Division of Nuclear Power Safety Royal Institute of Technology,
More informationINVESTIGATION INTO THE POOL-BOILING CHARACTERISTICS OF GOLD NANOFLUIDS. University of Missouri-Columbia. In Partial Fulfillment
INVESTIGATION INTO THE POOL-BOILING CHARACTERISTICS OF GOLD NANOFLUIDS A Thesis presented to the Faculty of the Graduate School University of Missouri-Columbia In Partial Fulfillment Of the Requirements
More informationIn Cheol BANG, Ji Hyun Kim School of Energy Engineering Ulsan National Institute of Science and Technology Republic of Korea
Rod-Type Quench Performance of Nanofluids Towards Developments of Advanced PWR Nanofluids-Engineered Safety Features In Cheol BANG, Ji Hyun Kim School of Energy Engineering Ulsan National Institute of
More informationHEAT TRANSFER IN POROUS SURFACES OF EVAPORATORS OF HEAT MACHINES AND DEVICES
VI Minsk International Seminar Heat Pipes, Heat Pumps, Refrigerators HEAT TRANSFER IN POROUS SURFACES OF EVAPORATORS OF HEAT MACHINES AND DEVICES Leonard L. Vasiliev 1, Alexander S. Zhuravlyov 2, Alexander
More informationDr. J. Wolters. FZJ-ZAT-379 January Forschungszentrum Jülich GmbH, FZJ
Forschungszentrum Jülich GmbH, FZJ ZAT-Report FZJ-ZAT-379 January 2003 Benchmark Activity on Natural Convection Heat Transfer Enhancement in Mercury with Gas Injection authors Dr. J. Wolters abstract A
More informationAlumina Nanoparticle Pre-coated Tubing Ehancing Subcooled Flow Boiling Cricital Heat Flux
Alumina Nanoparticle Pre-coated Tubing Ehancing Subcooled Flow Boiling Cricital Heat Flux The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters.
More informationPool boiling of water-al 2 O 3 and water-cu nanofluids on horizontal smooth tubes
NANO EXPRESS Open Access Pool boiling of water-al 2 O 3 and water-cu nanofluids on horizontal smooth tubes Janusz T Cieslinski *, Tomasz Z Kaczmarczyk Abstract Experimental investigation of heat transfer
More informationEffect of Nanofluid jet Impingement on its Heat Transfer Enhancement and Pumping Power
Effect of Nanofluid jet Impingement on its Heat Transfer Enhancement and Pumping Power #1 Kiran.D.Londhe, #2 S.U.Deshpande, #3 R.K.Sidheshwar 1 Mechanical Engg. Dept., JSCOE, Pune, MH, India 2 Mechanical
More informationMechanisms of Enhanced Heat Transfer in Nanofluids
Mechanisms of Enhanced Heat Transfer in Nanofluids J.A. Eastman, Materials Science Division, Argonne National Laboratory jeastman@anl.gov Fluctuations and Noise in Out of Equilibrium Systems, Sep 14-16,
More informationStudy of Solid Accretion Formation inside Pyrometallurgical Vessels by a Wax Model and Similarity Conversion for Gas Bottom-Blown Process
Materials Transactions, Vol. 48, No. 9 (07) pp. 2494 to 200 #07 The Japan Institute of Metals Study of Solid Accretion Formation inside Pyrometallurgical Vessels by a Wax Model and Similarity Conversion
More informationAnalysis of Nanofluids as Cutting Fluid in Grinding EN-31 Steel
www.nmletters.org Analysis of Nanofluids as Cutting Fluid in Grinding EN-31 Steel V. Vasu 1,, K. Manoj Kumar 2, (Received 13 August 2011; accepted 22 September 2011; published online 3 November 2011.)
More informationHEAT TRANSFER PERFORMANCE OF AN OIL JET IMPINGING ON A DOWNWARD-FACING STAINLESS STEEL PLATE
Issa, R. J.: Heat Transfer Performance of an Oil Jet Impinging on a THERMAL SCIENCE, Year 2011, Vol. 15, No. 2, pp. 397-408 397 HEAT TRANSFER PERFORMANCE OF AN OIL JET IMPINGING ON A DOWNWARD-FACING STAINLESS
More informationExperimental and Analytical Study of Aluminum-oxide Nanofluid Implication for Cooling System of an Amphibious Engine
Int J Advanced Design and Manufacturing Technology, Vol. 10/ No. 1/ March 2017 51 Experimental and Analytical Study of Aluminum-oxide Nanofluid Implication for Cooling System of an Amphibious Engine M.
More informationHEAT TRANSFER IN MINI HEAT EXCHANGER USING NANOFLUIDS. L.B. Mapa 1, Sana Mazhar 2 ABSTRACT
Session B-T4-4 HEAT TRANSFER IN MINI HEAT EXCHANGER USING NANOFLUIDS L.B. Mapa 1, Sana Mazhar 2 1 Purdue University Calumet, Indiana; Email: mapa@calumet.purdue.edu 2 Purdue University Calumet, Indiana;
More informationPreparation and Characterization of Copper Oxide -Water Based Nanofluids by One Step Method for Heat Transfer Applications
http://www.e-journals.in Chemical Science Transactions DOI:10.7598/cst2015.976 2015, 4(1), 127-132 RESEARCH ARTICLE Preparation and Characterization of Copper Oxide -Water Based Nanofluids by One Step
More informationVoid Fraction of CO2 and Ammonia in Multiport Aluminum Microchannel Tubes
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 26 Void Fraction of CO2 and Ammonia in Multiport Aluminum Microchannel Tubes
More informationEffects of Micro/Nano-Scale Surface Characteristics on the Leidenfrost Point Temperature of Water
Effects of Micro/Nano-Scale Surface Characteristics on the Leidenfrost Point Temperature of Water The MIT Faculty has made this article openly available. Please share how this access benefits you. Your
More informationEffect of heat transfer enhancement and NO x emission using Al 2 O 3 /water nanofluid as coolant in CI engine
Indian Journal of Engineering & Materials Sciences Vol. 20, October 2013, pp. 443-449 Effect of heat transfer enhancement and NO x emission using Al 2 O 3 /water nanofluid as coolant in CI engine M Raja
More informationTO CONDUCT THE PERFORMANCE TEST ON CHILLER UNIT BY USING NANOFLUID COOLED CONDENSER
Int. J. Mech. Eng. & Rob. Res. 2015 Anandakumar J, 2015 Research Paper ISSN 2278 0149 www.ijmerr.com Vol. 4, No. 1, January 2015 2015 IJMERR. All Rights Reserved TO CONDUCT THE PERFORMANCE TEST ON CHILLER
More informationAn Improvement in Thermal and Rheological Properties of Water-based Drilling Fluids Using Multiwall Carbon Nanotube (MWCNT)
Iranian Journal of Oil & Gas Science and Technology, Vol. 1 (2012), No. 1, pp. 55-65 http://ijogst.put.ac.ir An Improvement in Thermal and Rheological Properties of Water-based Drilling Fluids Using Multiwall
More informationA STEADY STATE MODEL FOR THE HEAT PIPE-ENCAPSULATED NUCLEAR HEAT SOURCE
Joint International Workshop: Nuclear Technology and Society Needs for Next Generation Berkeley, California, January 6-8, 2008, Berkeley Faculty Club, UC Berkeley Campus A STEADY STATE MODEL FOR THE HEAT
More informationLIQUID FILM THICKNESS IN MICRO TUBE UNDER FLOW BOILING CONDITION
Proceedings Proceedings of the of the ASME Seventh 2009 International 7th International ASME Conference Conference on on Nanochannels, Nanochannels, Microchannels Microchannels and and Minichannels Minichannels
More informationCONFIGURATION OF MICRO-LAYER IN BOILING IN NARROW GAPS FOR WATER
ISTP-16, 5, PRAGUE 16 TH INTERNATIONAL SYMPOSIUM ON TRANSPORT PHENOMENA CONFIGURATION OF MICRO-LAYER IN BOILING Yoshio UTAKA *, Yutaka TASAKI ** & Shuhei Okuda * * Division of Systems Research, Faculty
More informationPERFORMANCE EVALUATION OF PARALLEL AND COUNTER FLOW HEAT EXCHANGER USING NANOFLUID
PERFORMANCE EVALUATION OF PARALLEL AND COUNTER FLOW HEAT EXCHANGER USING NANOFLUID ABSTARCT Krishna R. Patel [1], D. C. Solanki [2], Rakesh Prajapati [3] Student (M. E. Thermal Engineering) [1], Professor
More informationA Simplified Model for Velocity and Temperature Evolution of Alloy Droplets in Centrifugal Atomisation and Spray Deposition
Materials Science Forum Vols. 475-479 (2005) pp. 4261-4271 online at http://www.scientific.net 2005 Trans Tech Publications, Switzerland A Simplified Model for Velocity and Temperature Evolution of Alloy
More informationWelding and post weld heat treatment of 2.25%Cr-1%Mo steel
University of Wollongong Thesis Collections University of Wollongong Thesis Collection University of Wollongong Year 2005 Welding and post weld heat treatment of 2.25%Cr-1%Mo steel Benjamin King University
More informationCHAPTER 6 ENHANCEMENT OF CRITICAL CHARACTERISTICS OF TRANSFORMER OIL USING NANOMATERIALS
120 CHAPTER 6 ENHANCEMENT OF CRITICAL CHARACTERISTICS OF TRANSFORMER OIL USING NANOMATERIALS 6.1 INTRODUCTION Transformer oil is typically a highly refined mineral oil that is stable at high temperature
More informationENHANCED FILMWISE CONDENSATION WITH THIN POROUS COATING
Proceedings of the First Pacific Rim Thermal Engineering Conference, PRTEC March 13-17, 2016, Hawaii's Big Island, USA PRTEC-14728 ENHANCED FILMWISE CONDENSATION WITH THIN POROUS COATING Ying Zheng *,
More informationBOILING HEAT TRANSFER CHARACTERISTICS OF IMMISCIBLE LIQUID MIXTURES
HEFAT2012 9 th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics 16 18 July 2012 Malta BOILING HEAT TRANSFER CHARACTERISTICS OF IMMISCIBLE LIQUID MIXTURES Hiroyuki Kobayashi,
More informationProfile LFR-70 TALL-3D SWEDEN. Thermal-hydraulic ADS Lead-bismuth Loop with 3D flow test section Lead-bismuth eutectics
Profile LFR-70 TALL-3D SWEDEN GENERAL INFORMATION NAME OF THE FACILITY ACRONYM COOLANT(S) OF THE FACILITY LOCATION (address): OPERATOR CONTACT PERSON (name, address, institute, function, telephone, email):
More informationMetal vapor micro-jet controls material redistribution in laser powder. bed fusion additive manufacturing
Metal vapor micro-jet controls material redistribution in laser powder bed fusion additive manufacturing Sonny Ly 1, Alexander M. Rubenchik 2, Saad A. Khairallah 3, Gabe Guss 4 and Manyalibo J. Matthews
More informationINFLUENCE OF MOLD SURFACE MATERIAL ON FLUIDITY AND TRANSFERABILITY OF RESIN DURING INJECTION MOLDING
ISTP-16, 25, PRAGUE 16 TH INTERNATIONAL SYMPOSIUM ON TRANSPORT PHENOMENA INFLUENCE OF MOLD SURFACE MATERIAL ON FLUIDITY AND TRANSFERABILITY OF RESIN DURING INJECTION MOLDING Nobuhiko NISHIWAKI, Sankei
More informationVisualization of pool boiling on plain micro-fins and micro- fins with sintered perforated foil
Journal of Physics: Conference Series PAPER OPEN ACCESS Visualization of pool boiling on plain micro-fins and micro- fins with sintered perforated foil To cite this article: R Pastuszko and R Kaniowski
More informationHEAT TRANSFER ENHANCEMENT OF CAR RADIATOR USING AQUA BASED MAGNESIUM OXIDE NANOFLUIDS
THERMAL SCIENCE: Year 2015, Vol. 19, No. 6, pp. 2039-2048 2039 HEAT TRANSFER ENHANCEMENT OF CAR RADIATOR USING AQUA BASED MAGNESIUM OXIDE NANOFLUIDS by Hafiz Muhammad ALI *, Muhammad Danish AZHAR, Musab
More informationEnhancement in Heat Transfer Rate In Diesel Engine Radiator Using Nano Fluid -A Review
Enhancement in Heat Transfer Rate In Diesel Engine Radiator Using Nano Fluid -A Review Payal R. Harkare 1, Dr. Sunil V.Prayagi 2 1 M-Tech (HPE) Third SEM, Dr.Babasaheb College of Engineering, Nagpur, India
More informationEffect of Vibration on Heat Transfer Enhancement in a Rectangular Channel Heat Exchanger
e-issn: 2278-1684, p-issn: 232-334X. PP 1-7 Effect of Vibration on Heat Transfer Enhancement in a Rectangular Channel Heat Exchanger Chatter Pal Saini 1, Sandeep Kumar 2 1 Department of Mechanical Engineering,
More informationEXPERIMENTAL RESULTS WITH NOVEL PLASMA COATED TUBES IN COMPACT TUBE BUNDLES. D. Schäfer, R. Tamme, H. Müller-Steinhagen, M. Müller
Proceedings of Fifth International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers: Science, Engineering and Technology, Eds. R.K. Shah, M. Ishizuka, T.M. Rudy, and V.V. Wadekar, Engineering
More informationAn Experimental Investigation of Thermal Conductivity of Nano Fluids Containing Al 2 O 3 for Heat Extraction
International Journal of Engineering and Applied Sciences (IJEAS) An Experimental Investigation of Thermal Conductivity of Nano s Containing Al 2 O 3 for Heat Extraction Dr. K. Vimalanathan, S. Karthick,
More informationChapter 3: Powders Production and Characterization
Chapter 3: Powders Production and Characterization Course Objective... To introduce selective powder production processes and characterization methods. This course will help you : To understand properties
More informationHEAT TRANSFER CHARACTERISTICS OF HYBRID MICROJET MICROCHANNEL COOLING MODULE
HEAT TRANSFER CHARACTERISTICS OF HYBRID MICROJET MICROCHANNEL COOLING MODULE Tomasz Muszynski 1, Rafal Andrzejczyk 1 1: Gdansk University of Technology, Faculty of Mechanical Engineering, Department of
More informationKirti Kanaujiya, Yugesh Mani Tiwari
International Journal of Scientific & Engineering Research, Volume 6, Issue 9, September-2015 1336 Experimental Investigation on Solidification Rate and Grain Size for Centrifugal Casting Kirti Kanaujiya,
More informationNANOFLUIDS FOR ENHANCED ECONOMICS AND SAFETY OF NUCLEAR REACTORS
NANOFLUIDS FOR ENHANCED ECONOMICS AND SAFETY OF NUCLEAR REACTORS Prof. Jacopo Buongiorno*, Dr. Lin-wen Hu** *Department of Nuclear Science and Engineering **Nuclear Reactor Laboratory Massachusetts Institute
More informationHeat Transfer Simulation to Determine the Impact of Al-5Mg Arc Sprayed Coating onto 7075 T6 Al Alloy Fatigue Performance
11 th International LS-DYNA Users Conference Simulation (5) Heat Transfer Simulation to Determine the Impact of Al-5Mg Arc Sprayed Coating onto 7075 T6 Al Alloy Fatigue Performance G. D Amours, B. Arsenault,
More informationMODELING OF MICRO-EXPLOSION FOR MULTICOMPONENT DROPLETS
MODELING OF MICRO-EXPLOSION FOR MULTICOMPONENT DROPLETS Yangbing Zeng and Chia-Fon Lee Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign INTRODUCTION Micro-explosion
More informationCHAPTER 2 LITERATURE SURVEY
5 CHAPTER 2 LITERATURE SURVEY 2.1 INTRODUCTION The thermo physical properties required for calculation of convective heat transfer coefficient and Nusselt number are thermal conductivity, viscosity, specific
More informationExperiments on Flow Boiling Heat Transfer of Pure CO2 and CO2-Oil Mixtures in Horizontal Smooth and Micro-Fin Tubes
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering Eperiments on Flow Boiling Heat Transfer of Pure CO and CO-Oil Mitures in Horizontal
More informationEffects of Electromagnetic Vibrations on Glass-Forming Ability in Fe-Co-B-Si-Nb Bulk Metallic Glasses
Materials Transactions, Vol. 47, No. 5 (2006) pp. 1360 to 1364 #2006 The Japan Institute of Metals Effects of Electromagnetic Vibrations on Glass-Forming Ability in Fe-Co-B-Si-Nb Bulk Metallic Glasses
More informationNanodiamond-Polymer Composite Fibers and Coatings
Nanodiamond-Polymer Composite Fibers and Coatings Yury Gogotsi et al. A.J. Drexel Nanotechnology Institute and Department of Materials Science and Engineering Drexel University, Philadelphia, Pennsylvania
More informationNUMERICAL MODELING AND SIMULATION OF COPPER OXIDE NANOFLUIDS USED IN COMPACT HEAT EXCHANGERS
International Journal of Mechanical Engineering (IJME) ISSN(P): 2319-2240; ISSN(E): 2319-2259 Vol. 4, Issue 2, Mar 2015, 1-8 IASET NUMERICAL MODELING AND SIMULATION OF COPPER OXIDE NANOFLUIDS USED IN COMPACT
More informationAnalysis of the Parameters of the Sintered Loop Heat Pipe
Heat Transfer Asian Research, 33 (8), 2004 Analysis of the Parameters of the Sintered Loop Heat Pipe K.J. Zan, 1 C.J. Zan, 1 Y.M. Chen, 1 and S.J. Wu 2 1 Department of Mechanical Engineering, National
More informationDOI: /adfm Nature-inspired Boiling Enhancement by Novel Nanostructured Macro-porous Surface**
Supporting Information for adfm.200701405 Submitted to DOI: 10.1002/adfm. 200701405 Nature-inspired Boiling Enhancement by Novel Nanostructured Macro-porous Surface** By Shanghua Li, Richard Furberg, Muhammet
More informationGraphite Sublimation Tests for the Muon Collider/Neutrino Factory Target Development Program. J. R. Haines and C. C. Tsai
Graphite Sublimation Tests for the Muon Collider/Neutrino Factory Target Development Program J. R. Haines and C. C. Tsai Rev 1 November 7, 2001 Graphite Sublimation Tests for the Muon Collider/Neutrino
More informationCharacteristics of an Open-Loop Pulsating Heat Pipe and Flow Visualization Using a Transparent Tube
10th IHPS, Taipei, Taiwan, Nov. 6-9, 2011 Characteristics of an Open-Loop Pulsating Heat Pipe and Flow Visualization Using a Transparent Tube Koji Fumoto a, Masahiro Kawaji b and Tsuyoshi Kawanami c a
More informationNumerical Prediction of Thermodynamics and Heat Transfer Characteristics of Nano Fluid.
Numerical Prediction of Thermodynamics and Heat Transfer Characteristics of Nano Fluid. Dr. S. Thanigaiarasu Associate Professor, Department of Aerospace Engineering, Madras Institute of Technology Campus,
More informationMater. Res. Soc. Symp. Proc. Vol Materials Research Society
Mater. Res. Soc. Symp. Proc. Vol. 940 2006 Materials Research Society 0940-P13-12 A Novel Fabrication Technique for Developing Metal Nanodroplet Arrays Christopher Edgar, Chad Johns, and M. Saif Islam
More informationAND TESTING OF A CARBON FOAM BASED SUPERCOOLER FOR HIGH HEAT FLUX COOLING IN OPTOELECTRONIC PACKAGES
Proceedings of the ASME 2009 ASME 2009 InterPACK Conference IPACK2009 July 19-23, 2009, San Francisco, California, USA InterPACK2009-89008 IPACK2009-89008 DESIGN AND TESTING OF A CARBON FOAM BASED SUPERCOOLER
More informationAbstract. Nomenclature. A Porosity function for momentum equations L Latent heat of melting (J/Kg) c Specific heat (J/kg-K) s Liquid fraction
Enthalpy Porosity Method for CFD Simulation of Natural Convection Phenomenon for Phase Change Problems in the Molten Pool and its Importance during Melting of Solids Abstract Priyanshu Goyal, Anu Dutta,
More information8.2 Pool Boiling Regimes
8.2 Pool Boiling Regimes The classical pool boiling curve is a plot of heat flux, q", versus excess temperature, ΔT = T w T sat. As the value of the excess temperature increases, the curve traverses four
More informationSupplementary Figure 1 Optical properties of the DLS. (a) The transmittance of water and
Supplementary Figure 1 Optical properties of the DLS. (a) The transmittance of water and the DLS in the wavelength range of 300-1500 nm (b) the reflectance of the DLS structure in the wavelength range
More informationProposal of utilizing uni-directional porous copper for extremely high heat flux removal
Engineering Conferences International ECI Digital Archives Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry Proceedings 7-5-2016 Proposal of utilizing
More informationEXPERIMENTAL INVESTIGATION ON COOLING RATE FOR CENTRIFUGAL CASTING Kirti Kanaujiya, Yugesh Mani Tiwari Department of Mechanical Engineering
ISSN 2320-9135 1 International Journal of Advance Research, IJOAR.org Volume 3, Issue 9, September 2015, Online: ISSN 2320-9135 EXPERIMENTAL INVESTIGATION ON COOLING RATE FOR CENTRIFUGAL CASTING Kirti
More informationEffect of air flowrate on particle velocity profile in a circulating fluidized bed
Korean J. Chem. Eng., 24(5), 851-855 (2007) SHORT COMMUNICATION Effect of air flowrate on particle velocity profile in a circulating fluidized bed Sansanee Kumthanasup and Suchaya Nitivattananon Fuel Research
More informationUse of levitating liquid micro-droplets as tracers to study the evaporation in the vicinity of the contact line
Use of levitating liquid micro-droplets as tracers to study the evaporation in the vicinity of the contact line Dmitry Zaitsev 1,2*, Dmitry Kirichenko 1,3, and Oleg Kabov 1,2 1 Institute of Thermophysics,
More informationAssessment of the effectiveness of nanofluids for single-phase and two-phase heat transfer in micro-channels
International Journal of Heat and Mass Transfer 50 (2007) 452 463 www.elsevier.com/locate/ijhmt Assessment of the effectiveness of nanofluids for single-phase and two-phase heat transfer in micro-channels
More informationSynthesis and Characterization of Nickel Oxide Nano Particles
International Journal of ChemTech Research CODEN (USA): IJCRGG, ISSN: 0974-4290, ISSN(Online):2455-9555 Vol.10 No.5, pp 145-149, 2017 Synthesis and Characterization of Nickel Oxide Nano Particles R. Srikanth
More informationAnalysis of electrical explosion of wire systems for the production of nanopowder
Sādhanā Vol. 37, Part 5, October 2012, pp. 629 635. c Indian Academy of Sciences Analysis of electrical explosion of wire systems for the production of nanopowder RASHMITA DAS, BASANTA KUMAR DAS, ROHIT
More informationHIGH EFFICIENCY NANOFLUID COOLING SYSTEM FOR WIND TURBINES
THERMAL SCIENCE: Year 2014, Vol. 18, No. 2, pp. 543-554 543 HIGH EFFICIENCY NANOFLUID COOLING SYSTEM FOR WIND TURBINES by Arturo DE RISI, Marco MILANESE, Gianpiero COLANGELO *, and Domenico LAFORGIA Department
More informationAvailable online at ScienceDirect. Procedia Engineering 105 (2015 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 105 (2015 ) 412 417 6th BSME International Conference on Thermal Engineering (ICTE 2014) Convective performance of 0.1 % volume
More informationExperimental investigation of heat dissipation for cross flow heat exchanger with conventional coolant based hybrid nano fluid.
Experimental investigation of heat dissipation for cross flow heat exchanger with conventional coolant based hybrid nano fluid. #1 Kiran Shivade, #2 Jayant Bhangale 1 PG Student,Heat Power Engg.,MCOERC,Nashik,
More informationCalculation and Analysis the Influence on the Cooling Water Velocity and Hot Metal Circulation to the Long Life Blast Furnace
Journal of Materials Science and Engineering B 5 (1-2) (2015) 36-41 doi: 10.17265/2161-6221/2015.1-2.003 D DAVID PUBLISHING Calculation and Analysis the Influence on the Cooling Water Velocity and Hot
More informationNanofluid Oscillating Heat Pipe
Nanofluid Oscillating Heat Pipe Hongbin Ma, Corey Wilson, Il Yoon and Yuwen Zhang Department of Mechanical and Aerospace Engineering University of Missouri Columbia, Missouri, 65211 Abstract An Oscillating
More informationEffective Thermal Conductivity of Layered Porous Media
Effective Thermal Conductivity of Layered Porous Media 10th IHPS, Taipei, Taiwan, Nov. 6-9, 2011 J. P. M. Florez a, G. G. V. Nuernberg a, M. B. H. Mantelli a, R. S. M. Almeida a and A. N. Klein b a Department
More informationAN EXPERIMENTAL STUDY OF THE EFFECTS OF SURFACE ROUGHNESS AND SURFACTANT ON POOL BOILING OF NANOFLUIDS
AN EXPERIMENTAL STUDY OF THE EFFECTS OF SURFACE ROUGHNESS AND SURFACTANT ON POOL BOILING OF NANOFLUIDS AN EXPERIMENTAL STUDY OF THE EFFECTS OF SURFACE ROUGHNESS AND SURFACTANT ON POOL BOILING OF NANOFLUIDS
More informationFlow and Heat Transfer Characteristics in High Porosity Metal Foams
Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering (MCM 2015) Barcelona, Spain July 20-21, 2015 Paper No. 333 Flow and Heat Transfer Characteristics in High Porosity Metal
More informationSUPPLEMENTARY INFORMATION
doi:10.1038/nature12740 1. Freezing of Impacting Droplets Ice build-up from freezing rain is problematic for variety of applications including aircraft surfaces, wind turbines, and power lines. If a water
More informationStudy of Unsteady State Thermal Characteristics of Homogeneous and Composite Walls of Building and Insulating Materials for Passive Cooling
Purdue University Purdue e-pubs International High Performance Buildings Conference School of Mechanical Engineering 2014 Study of Unsteady State Thermal Characteristics of Homogeneous and Composite Walls
More informationExperimental Study of Convective Heat Transfer in Miniature Double Tube Hair-Pin Heat Exchanger
125 Experimental Study of Convective Heat Transfer in Miniature Double Tube Hair-Pin Heat Exchanger M Kumar 1, V K Yadav 2, B Verma 3, K K Srivastava 4 1, 2, 3, 4 Department of chemical Engineering and
More informationInternational Engineering Research Journal EXPERIMENTAL ANALYSIS OF I.C ENGINE RADIATOR WITH Al2O3 NANO FLUID
International Engineering Research Journal EXPERIMENTAL ANALYSIS OF I.C ENGINE RADIATOR WITH Al2O3 NANO FLUID Pravinkumar Jayatwar, M.S.Deshmukh Department of Mechaniacal Engineering,S.P.University,Pune,R.S.C.O.E
More informationExperimental Heat Transfer Analysis on Heat Pipe using Sio2 and Tio2 Nano Fluid
Journal of Applied Fluid Mechanics, Vol. 11, Special Issue, pp. 91-101, 2018. Selected papers from International Conference on Newer Techniques and Innovations in Mechanical Engineering (ICONTIME 2K18),
More informationEFFECTS OF A WIRE MESH ON DROPLET SIZE AND VELOCITY DISTRIBUTIONS OF CRYOGENIC SPRAYS. Walfre Franco, Henry Vu and Guillermo Aguilar
Proceedings of HT2005 2005 ASME Summer Heat Transfer Conference July 17-22, 2005, San Francisco, California, USA HT2005-72582 EFFECTS OF A WIRE MESH ON DROPLET SIZE AND VELOCITY DISTRIBUTIONS OF CRYOGENIC
More informationTexture and Wettability of Metallic Lotus Leaves
Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2015 Nanoscale Supplementary Information for: Texture and Wettability of Metallic Lotus Leaves C. Frankiewicz
More informationGas Quenching With Air Products Rapid Gas Quenching Gas Mixture
Gas Quenching With Air Products Rapid Gas Quenching Gas Mixture Minfa Lin, Ph.D., Senior Principal Research Engineer, Air Products and Chemicals, Inc. Gas Quenching With Air Products Rapid Gas Quenching
More informationThermal Analysis of Solar Flat Plate Collector
Thermal Analysis of Solar Flat Plate Collector # Yakoob Kolipak,Associate Professor, ME Dept, E-mail:yakoob.cjits @gmail.com # Kranthi Kumar Guduru,Assistant Professor,ME Dept, E-mail: kranthicjits1@gmail.com
More informationPhysical Simulation of a CZ-Process of Semiconductor Single Crystal Growth
International Scientific Colloquium Modeling for Saving Resources Riga, May 17-18, 2001 Physical Simulation of a CZ-Process of Semiconductor Single Crystal Growth L. Gorbunov, A. Klyukin, A. Pedchenko,
More informationExperimental investigations of the quenching phenomena for hemispherical downward facing convex surfaces with narrow gaps
International Communications in Heat and Mass Transfer 34 (2007) 28 36 www.elsevier.com/locate/ichmt Experimental investigations of the quenching phenomena for hemispherical downward facing convex surfaces
More informationDESIGN OF PERIODIC CELLULAR STRUCTURES FOR HEAT EXCHANGER APPLICATIONS
DESIGN OF PERIODIC CELLULAR STRUCTURES FOR HEAT EXCHANGER APPLICATIONS Vikas Kumar 1, Guhaprasanna Manogharan 1, Denis R. Cormier 2 1 Department of Industrial & Systems Engineering North Carolina State
More information