Design and Heat Transfer Performance of Shell and Tube Heat Exchanger by using Nano Fluids

Transcription

1 Degn and Heat Transfer Performance of Shell and Tube Heat Exchanger by ung Nano Fluids V. Ashok Kumar 1, K. Upender 2 Associate Professor, Mechanic Engineering, Mother Theressa College of Engg & Tech. Peddapli, Telangana 1 M. Tech, Student, Mechanic Engineering, Mother Theressa College of Engg. & Tech. Peddapli, Telangana 2 Abstract: Heat exchanger is a device used to transfer heat between one or more fluids. In this thes, different nano fluids mixed with base fluid water are anyzed for their performance in the radiator. The nano fluids are Aluminum Oxide, Silicon Oxide and Titanium carbide for two volume fracons,. Theorec cculaons are done determine the properes for nano fluids and those properes are used as inputs for anys.3d model of the shell and tube heat exchanger is done in Pro/Engineer. CFD anys is done on the shell and tube heat exchanger for l nano fluids and volume fracon and therm anys is done in Ansys for two materis Aluminum and Copper for better fluid at better volume fracon from CFD anys. Key words: Finite element anys, steam boiler, CFD anys, therm anys. I. INTRODUCTION Heat exchangers are one of the mostly used equipment in the process industries. Heat Exchangers are used to transfer heat between two process streams. One can reize their usage that any process which involve cooling, heang, condensaon, boiling or evaporaon will require a heat exchanger for these purpose. Fig. Segment baffled one-pass shell and two-pass tube shell-and-tube heat exchanger Different heat exchangers are named according to their applicaon. For example, heat exchangers being used to condense are known as condensers, milarly heat exchanger for boiling purposes are cled boilers. Performance and efficiency of heat exchangers are measured through the amount of heat transfer ung least area of heat transfer and pressure drop. A better presentaon of its efficiency is done by cculang over l heat transfer coefficient. Pressure drop and area required for a certain amount of heat transfer, provides an inght about the capit cost and power requirements (Running cost) of a heat exchanger. Usuly, there is lots of literature and theories to degn a heat exchanger according to the requirements. II. LITERATURE REVIEW Shell-and-tube heat exchangers are used widely in the chemic process industries, especily in refineries, because of the numerous advantages they offer over other types of heat exchangers. A lot of informaon is available regarding their degn and construcon. The present notes are intended only to serve as a brief introducon. III. RESEARCH GAP & PROBLEM DESCRIPTION In the research by R. Shankar Subramanian, the shell and tube heat exchanger is taken in the water with various temperatures. In this thes, ong with water Aluminum Al 2 O 3, licon oxide and tanium carbide nano fluid at different volume fracons ( and ) of the shell and tube heat exchanger is anyzed for heat transfer properes, temperature, pressure,velocity and mass flow rates in CFD anys. In therm anys, two materis Copper and Aluminum are condered for heat exchanger. Modeling is done in Pro/Engineer, Therm anys and CFD anys is done in Ansys. The boundary condions for therm anys are temperatures, for CFD anys is pressure, velocity and temperature. IV. INTRODUCTION TO CAD/CAE Computer-aided degn (CAD), so known as computer-aided degn and drafng (CADD), is the use of computer technology for the process of degn and degn-documentaon. INTRODUCTION TO PRO-ENGINEER Pro/ENGINEER Wildfire is the standard in 3D product degn, featuring industry-leading producvity tools that promote best pracces in degn while ensuring compliance with your industry and company standards. Integrated Pro/ENGINEER CAD/CAM/CAE soluons low you to degn faster than ever, while maximizing innovaon and quity to ulmately create excepon products. Copyright to IARJSET DOI /IARJSET

2 Different modules in pro/engineer Part degn, Assembly, Drawing& Sheet met. INTRODUCTION TO FINITE ELEMENT METHOD: Finite Element Method (FEM) is so cled as Finite Element Anys (FEA). Finite Element Method is a bac anys technique for resolving and substung complicated problems by mpler ones, obtaining approximate soluons Finite element method being a flexible tool is used in various industries to solve sever pracc engineering problems. In finite element method it is feable to generate the relave results. V. MODELING AND ANALYSIS 3D MODEL OF SHELL AND TUBE HEAT EXCHANGER CALCULATIONS TO DETERMINE PROPERTIES OF NANO FLUID BY CHANGING VOLUME FRACTIONS Volume fracon= & (taken from journ paper) NOMENCLATURE ρ nf = Denty of nano fluid (kg/m 3 ) ρ s = Denty of solid materi (kg/m 3 ) ρ w = Denty of fluid materi (water) (kg/m 3 ) ϕ = Volume fracon C pw = Specific heat of fluid materi (water) (j/kg-k) C ps = Specific heat of solid materi (j/kg-k) µ w = Viscoty of fluid (water) (kg/m-s) µ nf = Viscoty of Nano fluid (kg/m-s) K w = Therm conducvity of fluid materi (water) (W/m-k) K s = Therm conducvity of solid materi (W/m-k) NANO FLUID CALCULATIONS DENSITY OF NANO FLUID ρ nf = ϕ ρ s + [(1-ϕ) ρ w ] CUT SECTION 2D MODEL OF SHELL AND TUBE HEAT EXCHANGER SPECIFIC HEAT OF NANO FLUID C p nf = ϕ ρs Cps + 1 ϕ (ρw Cpw ) ϕ ρs+(1 ϕ) ρw VISCOSITY OF NANO FLUID µ nf =µ w (1+2.5ϕ) THERMAL CONDUCTIVITY OF NANO FLUID Ks +2Kw +2 Ks Kw 1+β ³ ϕ K nf = k w Ks +2Kw 2 Ks Kw 1+β ³ ϕ NANO FLUID PROPERTIES CFD ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER Copyright to IARJSET DOI /IARJSET

3 ALUMINUM OXIDE NANO FLUID VOLUME FRACTION - STATIC PRESSURE Tot Heat Transfer Rate (w) STATIC TEMPERATURE SILICON OXIDE NANO FLUID VOLUME FRACTION - STATIC PRESSURE VELOCITY MAGNITUDE STATIC TEMPERATURE HEAT TRANSFER CO-EFFICIENT VELOCITY MAGNITUDE Copyright to IARJSET DOI /IARJSET

4 HEAT TRANSFER CO-EFFICIENT STATIC TEMPERATURE VELOCITY MAGNITUDE HEAT TRANSFER CO-EFFICIENT REPORTS TITANIUM CARBIDE NANO FLUID VOLUME FRACTION - STATIC PRESSURE Copyright to IARJSET DOI /IARJSET

5 c c IARJSET VI. RESULTS AND DISCUSSIONS CFD anys Graphs 1.5E+3 1.E+3 5.E+2.E+ pressure c pressure velocity velocity THERMAL ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER MATERIAL-ALUMINUM ALLOY ALUMINUM OXIDE NANO FLUID AT VOLUME FRACTION - MATERIAL-COPPER ALLOY TEMPERATURE Heat transfer coefficient Heat transfer coefficient HEAT FLUX 1 5 mass flow rate m as s f heat transfer rate heat transfer rate GRAPHS Copyright to IARJSET DOI /IARJSET

6 heat flux(w/mm2) IARJSET THERMAL ANALYSIS GRAPHS uminum copper nano fluides VII. CONCLUSION 3D model of the shell and tube heat exchanger is done in Pro/Engineer. CFD anys is done on the shell and tube heat exchanger for l nano fluids Aluminum Oxide, Silicon Oxide and Titanium Carbide and at different volume fracons,. By observing the CFD anys results, the pressure are more for uminum oxide at volume fracon of and mass flow rate is more for tanium carbide at volume fracon of. The heat transfer coefficient and heat transfer rate are s more for Aluminum oxide at volume fracon of. Therm anys is done for two materis Aluminum and Copper taking heat transfer coefficient vue of Aluminum oxide at volume fracons from CFD anys. By observing therm anys results, heat flux is more when Copper is used than Aluminum loy. REFERENCES 1. A.O. Adelaja, S. J. Ojolo and M. G. Sobamowo, Computer Aided Anys of Therm and Mechanic Degn of Shell and Tube Heat Exchangers, Advanced Materis Vol. 367 (212) pp (212) Trans Tech Publicaons, Switzerland. 2. Yusuf Ali Kara, Ozbilen Guraras, A computer program for degning of Shell and tube heat exchanger, Applied Therm Engineering 24(24) Rajagap THUNDIL KARUPPA RAJ and Srikanth GANNE, Shell de numericanys of a shell and tube heat exchanger condering the effects of baffle inclinaon angle on fluid flow, Thundil Karuppa Raj, R., et : Shell Side Numeric Anys of a Shell and Tube Heat Exchanger,THERMAL SCIENCE: Year 212, Vol. 16, No. 4, pp S. Noie Baghban, M. Moghiman and E. Sehi, Therm anys of shell-de flow of shell-and tube heat exchanger ung experiment and theorec methods (Received: October 1, Accepted in Revised Form: June 3, 1999). 5. A.GopiChand, Prof.A.V.N.L.Sharma, G.Vijay Kumar, A.Srividya, Therm anys of shell and tube heat exchanger ung mat lab and floefd software,volume: 1 Issue: ,ISSN: Hari Haran, Ravindra Reddy and Sreehari, Therm Anys of Shell and Tube Heat ExChanger Ung C and Ansys,Internaon Journ of Computer Trends and Technology (IJCTT) volume 4 Issue 7 July 213. Copyright to IARJSET DOI /IARJSET