Performance Analysis of an Automobile Radiator

Transcription

1 IJIRST International Journal for Innovative Research in Science & Technology Volume 1 Issue 12 May 2015 ISSN (online): Performance Analysis of an Automobile Radiator using CFG Hardikkumar B Patel PG Student Department of Mechanical Engineering (I.C & AUTO.) Merchant Institute of Technology, Piludara Deepu Dinesan Assistant Professor Department of Mechanical Engineering Merchant Institute of Technology, Piludara Abstract The thermal performance of an automotive radiator plays an important role in the performance of an automobile s cooling system and all other associated systems. For a number of years, this component has suffered from the little attention with very little changing in its manufacturing cost, operation and geometry. As opposed to the old tubular heat exchangers currently form the backbone of today s process industry with their advanced performance reading levels tubular heat exchanges can only dream of. In this thesis, we perform first solid modeling of the Radiator in Solid works and then this solid model is transferred to the ANSYS Workbench mesh module for meshing. After completing meshing, this meshed model is transferred to ANSYS CFX for CFD Analysis. Once CFD Analysis is complied with ANSYS CFX. Our Aim is to examine how the efficiency of the radiator can be enhanced by changing certain geometrical and operating parameter like Fluid Composition (Additives), Composition percentage, Tube Diameter etc. After completing all the above parametric study, we can suggest best configured radiator for optimum performance. Keywords: Automobile Radiator, CFD, Parameter analysis, ANSYS CFX I. INTRODUCTION There are two main types of cooling system for keeping the temperature of the automobile engine within the reasonable limits. These are the direct cooling or Air Cooling and the indirect Air or Water cooling systems. The indirect air cooling is called Water cooling system. In indirect cooling, as the coolant flows through the tubes of the radiator, heat is transferred through the Fins and tube walls to the air by conduction and convection. The Radiator of Tata indigo car is analyzed to get heat transfer rate at Different parameter effect in this study. Fig. 1: Radiator II. EXPERIMENTAL DATA Fig. 2: Dimension Drawing Sheet All rights reserved by 318

2 Model No HL TATA INDIGO/INDICA Shell Side Data:- Media: - Air Temperature: - 35 C Inlet Velocity: - 10 m/s Outlet Pressure: bar Tube Side Data:- Diameter of Tube:- 7 mm No. of Tubes: - 29 Media: - Water + Ethanol (50%) Temperature (Engine):- 95 C Inlet Velocity: - 2m/s Pitch of Fin: 0.8 Table - 1 III. CFD ANALYSIS & VALIDATION Fig. 3: Modeling of Radiator Fig. 4: Meshed model of radiator Fig. 5: Outlet Temperature Tube side Table - 1 Comparison with Exp. Result Sr No. Experimental Results CFD Analysis Results % Variation All rights reserved by 319

3 IV. RESULTS AND DISCUSSIONS FOR EFFECT OF VARIOUS PARAMETER A. Effect of Radiator Tube side Fluid on Radiator Performance: Fig. 6: Outlet Temp.* Water + 70% Ethanol Fig. 7: outlet Temp.* Water + 50% Ethanol Fig. 8: Outlet Temp.* Water + 30% Ethanol Fig. 9: Effect of Tube Side Fluid B. Effect of Tube Diameter on Radiator Performance: Fig. 10: Outlet Temp.* Tube Dia 12 mm Fig. 11: Outlet Temp.* Tube Dia 6 mm All rights reserved by 320

4 Fig. 12: Outlet Temp.* Tube Dia 4 Mm Fig. 13: Effect of Tube Diamete C. Effect of Coolant (Methanol and Propanol): Fig. 14: Outlet Temp. * Water + 50% Methanol Fig. 15: Outlet Temp. * Water + 50% Propanol Fig. 16: Outlet Temp. * Water + 50% Ethanol Fig. 17: Effect of Fluid Composition V. CONCLUSION We are increasing the water in the mixture tube side outlet temperature will be decreasing in the radiator to 349, So as the higher mixing ration of the water is desirable for achieving better performance of the radiator. If we are decreasing the tube diameter, then the tube side outlet temperature will be increasing in the radiator to As we are decreasing here the tube diameter, so as the diameter is decreasing the friction force acting at the extreme fiber of the intersection zone of inner fluid and the solid will be increasing and due to that phenomena the temperature rise in the small diameter tube and which is not desirable, it leads to poor performance. Also from the other comparison, we can conclude that by fixing the water proportion and taking the reading with different coolant (IE. Like Methanol, Propanol, Ethanol) in 50 % mixing ration with the water, then the Ethanol gives the highest outlet temperature of C among all the mixtures and Methanol gives the Least outlet temperature as C. So from the result, it is desirable to use Methanol with water, which gives better performance but the difference is not much more between all the coolants and that's why by sometimes seeing the toxicity and other property Ethanol is more desirable to use among all the coolants even it gives the high temperature at the outlet. All rights reserved by 321

5 REFERENCES [1] Salvio Chako,Dr.Biswadip Shome and Vinod Kumar Numerical Simulation For Improving Radiator Efficiency, Engineering Automation Group, Tata Technologies Limited, Engineering research Center, Tata Motors Limited, India, [2] Mohd Yusoff Sulaiman, Shamsul Bahari Azraai, Wan Mokhtar CFD Modelling of Air Flow Distribution from a Fan, University Teknical Malaysia Melaka, Malaysia, [3] A.Witry, M.H. Al-Hajeri and Ali A. Bondac, 2003, CFD analysis of fluid flow and heat transfer in patterned roll bonded aluminium radiator, 3rd International conference on CFD, CSIRO, Melbourne, Australia, pp [4] Sridhara,S.R.Shankalp and V.Umesh Babu CFD Analysis of fluid flow and heat transfer in a single tube-fin arrangement of an automotive Radiator International Conference on Mechanical Engineering 2005(ICME2005)28-30December 2005,Dhaka,Bangladesh. [5] C. Oliet, A.Oliva,J.Castro, Parametric studies on automotive radiators Applied Thermal Engineering 27 (2007) All rights reserved by 322