A Study of Curved Louver Fin Configuration for ‎Heat Transfer Enhancement

Document Type : Research Paper

Authors

1 Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2 Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand‎

Abstract

Herein, the heat transfer performance of the curved surface of a louvered fin heat exchanger using computational fluid dynamics (CFD) is examined. Four new models are used with curved surfaces in different locations. The air inlet velocity is 1–9 m/s. The air and fin wall temperature remain constant at 300 and 353 K, respectively. The result of the reference flat fin is confirmed with experimental results. The results demonstrate that curved fins changed the airflow path and created vortices. The air tends to flow between louver fins, improving its velocity and enhancing heat transfer. The result from the case that individual fin is close to the middle fin demonstrated that louver fin provides a 15% increase compared to that of the reference. However, when the air inlet velocity is high, the performance evaluation criteria from the case that individual fin is close to the first fin, is the highest, which results in a 1% increase from that of the reference. Therefore, increasing heat transfer can compensate the effect of pressure drop because of vortices in the louver fin domain. This study can be applied to the air conditioning system to increase its efficiency and cut the operation cost down.

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Main Subjects

Publisher’s Note Shahid Chamran University of Ahvaz remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. 

[1] Mori Y., Nakayama W., Recent advances in compact heat exchangers in Japan, COMPACT HEAT EXCHANGERS-HISTORY, TECHNOLOGICAL ADVANCEMENT & MECHANICAL DESIGN PROBLEMS, ASME WINTER ANNUAL MEETING, 10, 1980, 5-16.
[2] Rohsenow W.M., Hartnett J.P., Ganic E.N., Handbook of heat transfer applications, New York, McGraw-Hill Book Co., 1985.
[3] Webb R.L., Trauger P., How structure in the louvered fin heat exchanger geometry, Experimental Thermal and Fluid Science, 4(2), 1991, 205-217.
[4] Chang Y.J., Wang C.C., A generalized heat transfer correlation for Iouver fin geometry, International Journal of Heat and Mass Transfer, 40(3), 1997, 533-544.
[5] Wang C.C., Lee C.J., Chang C.T., Lin S.P., Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers, International Journal of Heat and Mass Transfer, 42(11), 1999, 1945-1956.
[6] Chang Y.J., Hsu K.C., Lin Y.T., Wang C.C., A generalized friction correlation for louver fin geometry, International Journal of Heat and Mass Transfer, 43(12), 2000, 2237-2243.
[7] Park Y.G., Jacobi A.M., Air-Side Heat Transfer and Friction Correlations for Flat-Tube Louver-Fin Heat Exchangers, Journal of Heat Transfer, 131(2), 2008, 021801-021801-12.
[8] Kim M.H., Bullard C.W., Air-side thermal hydraulic performance of multi-louvered fin aluminum heat exchangers, International Journal of Refrigeration, 25(3), 2002, 390-400.
[9] Shah R.K., Sekulic D.P., Fundamentals of heat exchanger design, John Wiley & Sons, 2003.
[10] Sadeghianjahromi A., Kheradmand S., Nemati H., Developed correlations for heat transfer and flow friction characteristics of louvered finned tube heat exchangers, International Journal of Thermal Sciences, 129, 2018, 135-144.
[11] Perrotin T., Clodic D., Thermal-hydraulic CFD study in louvered fin-and-flat-tube heat exchangers, International Journal of Refrigeration, 27(4), 2004, 422-432.
[12] Ryu K., Yook S.J., Lee K.S., Optimal design of a corrugated louvered fin, Applied Thermal Engineering, 68(1), 2014, 76-79.
[13] Jang J.Y., Chen C.C., Optimization of louvered-fin heat exchanger with variable louver angles, Applied Thermal Engineering, 91, 2015, 138-150.
[14] Qian Z., Wang Q., Cheng J., Deng J., Simulation investigation on inlet velocity profile and configuration parameters of louver fin, Applied Thermal Engineering, 138, 2018, 173-182.
[15] Tanaka T., Itoh M., Kudoh M., Tomita A., Improvement of Compact Heat Exchangers with Inclined Louvered Fins, Bulletin of JSME, 27(224), 1984, 219-226.
[16] Manglik R.M., Bergles A.E., Heat transfer and pressure drop correlations for the rectangular offset strip fin compact heat exchanger, Experimental Thermal and Fluid Science, 10(2), 1995, 171-180.
[17] Dejong N.C., Jacobi A.M., An experimental study of flow and heat transfer in parallel-plate arrays: local, row-by-row and surface average behavior, International Journal of Heat and Mass Transfer, 40(6), 1997, 1365-1378.
[18] Wanglertpanich K., Kittichaikarn C., Heat transfer efficiency enhancement using zigzag louvered fin, Numerical Heat Transfer, Part A: Applications, 79(4), 2021, 278-293.
[19] ANSYS FLUENT 18.1 Theory Guide, 2017.