# CFD ANALYSIS ON LOUVERED FIN

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2 2. MODELLING AND THERMAL ANALYSIS OF RECTANGULAR AND LOUVERED FIN Geometrical model of rectangular fin and louvered fin are modeled with creo parametric 2.0 and the dimensions of rectangular fin considered for the study is given below. The solid model of louvered fin using Creo parametric 2.0 is shown in Fig. 3. The meshed model of the same is shown in Fig. 4. The number of nodes and elements were and respectively. Rectangular fin thickness =0.25mm Rectangular fin length=60mm Rectangular fin width=15mm Rectangular tube diameter=10mm Number of fins considered =16 Rectangular fin height=30mm Fig-4: Louvered Fin Meshing 3. ALUMINUM ALLOY 6061 PROPERTIES The Composition of Al6061 is given below Fig-2 :Meshing of rectangular fin The solid model developed is subjected to meshing using anysis for a rectangular fin as shown in Fig. 2. The number of nodes are and elements respectively.the dimensions of louvered fin considered for the study are as follows. Louvered finned rectangular tube width=7.5 mm Louvered finned rectangular tube length=15mm Number of louvered fins considered =6 Mg = % Si = % Cu = % Cr = % Mn =0.15 % Fe =0.7 % Zn =0.25 % Ti =0.15 % Al =95.85%-98.56% Al6061 has the following advantages Excellent corrosion resistance to atmosphere condition Good weldability and brazability Co efficient of linear thermal expansion 23.5x10-6 m/ 0 C Thermal conductivity 173 W/m. K Melting point is C Modulus of elasticity is G Pa. Poisson ratio is THERMO PHYSICAL PROPERTIES OF FLUID Fig-3: Louvered Fin Geometry In automobile radiator is used as cold fluid runs in the tubes. This does not have sufficient strength to fight against cold weather. It becomes ice in cold weather so one other fluid mixed with this and name is this fluid is ethylene glycol. This has sufficient antifreeze property to make help to the to stable liquid in cold weather. 2017, IRJET Impact Factor value: ISO 9001:2008 Certified Journal Page 1459

3 Viscosity, cp Thermal conductivity,w/m.k International Research Journal of Engineering and Technology (IRJET) e-issn: Ethylene oxide reacts with to produce ethylene glycol according to the chemical equation. C 2H 4 + 2H 2O HO CH 2CH 2 OH Fig.6 shows the variation of viscosity with temperature. It is seen that variation of viscosity is found to be marginal within normal operating range as compared to without compromising much of pump work required /50 Ethylene glycol with mixture Pure 5. RESULTS AND DISCUSSIONS The temperature distribution and heat flux distribution for a rectangular fin are shown in Fig. 7 and 8 respectively. A localized high temperature is observed at coolant inlet passage with not much temperature drop along the section of the fin. The thermal conductivity of the aluminum and the geometry of the fins are found to influence the temperature distribution along the tubular radiator Temperature, 0 C Fig-5: Variation of Thermal conductivity of 50/50 Ethylene glycol with mixture and pure with temperature Variation of thermal conductivity of 50/50 Ethylene glycol with mixture and pure is shown in Fig. 5. Ethylene glycol mixture certainly has a higher thermal conductivity as compared to and hence has a better heat transfer capabilities as compared to. The presence of ethylene glycol could influence freezing temperature of fluid also. Fig-7: Temperature Distribution in rectangular fin /50 Ethylene glycol with mixture Pure Temperature, 0 C Fig-8: Total Heat Flux in rectangular fin Fig-6: Variation of Viscosity of 50/50 Ethylene glycol with mixture and pure with temperature The maximum and minimum temperatures were found to be 75 0 C and 24 0 C respectively as seen in Fig. 7. A maximum 2017, IRJET Impact Factor value: ISO 9001:2008 Certified Journal Page 1460

4 heat flux of W/m 2 was found at the entry region of rectangular finned radiator as shown in Fig.8. Fig-11: Static pressure in rectangular fin Fig-9: Temperature Distribution: Louvered fin The pressure distribution along the test section is shown in Fig.11. The maximum static pressure of 34.6 N/m 2 is found to exist at the central coolant passages for a rectangular fin. The rest of the test section is found to be exposed to a nominal pressure of 12.6 N/m 2. The temperature distribution across louvered fin radiator is shown in Fig. 9. The maximum and minimum temperature was found to be 75 0 C and 22 0 C respectively. The temperature distribution indicates that the geometry and thermal properties of louvered fin is found to have a profound influence on temperature distribution as compared to rectangular fin. The region in proximity of the coolant passage is found to be at a higher temperature with a significant drop in temperature along the fin. Fig-12: velocity in rectangular fin The velocity distribution of coolant through the coolant passages is shown in Fig. 12 for test section with rectangular fin. The maximum velocity of fluid distributions is found to be m/s. Fig-10: Total heat flux: Louvered fin The heat flux density for louvered fin is shown in Fig. 10. The maximum heat flux of 35657W/m 2 is found to exist at the entry region with few concentrated zones and there is a proportionate drop in heat flux away from coolant flow passages. Fig-13: Static pressure in Louvered fin 2017, IRJET Impact Factor value: ISO 9001:2008 Certified Journal Page 1461

5 The static pressure distribution in louvered fin is shown in Fig. 13. The pressure is found to be distributed across the test section with a maximum pressure of 52.5 N/m 2 found to exist across the passages attached to the louvered fins at the entry zone with marginal drop in pressure at the exit of the test section. Fig-14: Velocity distribution in Louvered fin The velocity distribution in louvered fin is shown in Fig. 14. The maximum fluid velocity of 1.41 m/s was estimated for the coolant passing through the louvered cross section. 6. COMPARSION OF RECTANGULAR AND LOUVERED FIN RESULTS Parameter Heat Flux (W/m 2 ) Rectangular fin Louvered fin REFERENCES [1] Durgesh Kumar Chavan and Ashok T. Pise Sahin, Performance Investigation of an Automotive Car Radiator Operated with Nano fluid as a Coolant, (2010). [2] Gunnasegaran, The effect of geometrical Parameters on Heat Transfer Characteristics of compact heat exchanger with Louvered Fins, (2012). [3] Junjanna G.C, Performance Improvement of a Louver-Finned Automobile Radiator Using Conjugate Thermal CFD Analysis, (2012), pp [4] JP Yadav and Bharat Raj Singh, Study on Performance Evaluation of Automotive Radiator (2011), pp [5] Jaya Kumar, Experimental study and CFD Analysis of Copper radiator for Passenger Cars, (2016), pp [6] Masoud Asadi, Minimizing entropy generation for louvered fins plate fin compact heat exchanger, (2013), pp [7] Manjunath, Numerical Investigation of automotive radiator louvered fin compact heat exchanger, (2014), pp [8] Paresh Machhar, Falgun Adroja, Heat Transfer Enhancement of Automobile Radiator with TiO2/Water Nano fluid, (2013), pp [9] Pooranachandran karthik, Experimental and numerical investigation of a louvered fin and elliptical tube compact heat exchanger, (2015), pp Velocity (m/s) Temperature (K) Total Heat Transfer rate at wall (W) CONCLUSIONS The comparative CFD analysis on rectangular and louvered finned heat exchanger with 50/50 Ethylene glycol and mixture as working fluid reveals louvered fins exhibit better heat transfer characteristics as compared to rectangular fins. The heat transfer rate was found to be 49% more for louvered fins as compared to rectangular fins. The velocity was found to be significantly higher for louvered fins which might be a contributing factor for enhanced heat transfer rate in louvered fins. 2017, IRJET Impact Factor value: ISO 9001:2008 Certified Journal Page 1462

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