와류발생기를 사용한 핀-관 열교환기의 열성능 향상에 관한 연구
A Study on Improving Heat Performance of Fin-Tube Heat Exchangers. Using Vortex Generators
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Heat transfer enhancement of fin-tube heat exchangers with vortex generators is investigated using naphthalene sublimation technique. Experiments are performed for the fin-flat tube and the fin-circular tube heat exchangers with and without vortex generator. Vortex generators are found to enhance heat transfer rate on the fin surface dramatically. Their effect is relatively high in the fin-flat tube heat exchanger compared to fin-circular tube heat exchanger. Performance test is done for the prototype of air-conditioning heat exchanger and gas boiler heat exchanger with and without vortex generators .Fin-flat tube heat exchanger with vortex generator promote local heat transfer coefficient by 75% and increase friction factor, but friction of fin-flat tube heat exchanger with vortex generator is lower than that of fin-circular tube heat exchanger without vortex generator by 45%
Abstract
Heat transfer enhancement of fin-tube heat exchangers with vortex generators is investigated using naphthalene sublimation technique. Experiments are performed for the fin-flat tube and the fin-circular tube heat exchangers with and without vortex generator. Vortex generators are found to enhance heat transfer rate on the fin surface dramatically. Their effect is relatively high in the fin-flat tube heat exchanger compared to fin-circular tube heat exchanger. Performance test is done for the prototype of air-conditioning heat exchanger and gas boiler heat exchanger with and without vortex generators .Fin-flat tube heat exchanger with vortex generator promote local heat transfer coefficient by 75% and increase friction factor, but friction of fin-flat tube heat exchanger with vortex generator is lower than that of fin-circular tube heat exchanger without vortex generator by 45%
참고문헌 (5)
- Kays, W. M., "Compact Heat Exchangers" (1964), McGraw-Hill
- Tiggelbeck, S., "Comparison of Wing-Type Vortex Generators for Heat Transfer Enhancement in Channel Flows", J. of Heat Transfer, 116, pp.880~885 (1994)
- Biswas, G., "Heat Transfer Enhancement in Fin-tube Heat Ex- changers by Winglet Type Vortex Generators", Int. J. of Heat Mass Transfer, 37(2), pp.283~294 (1994)
- 와류발생기를 사용한 고효율 납작관형 핀-관 열교환기 개발, "유성연", 통상산업부, ~, pp.95-P-10-2 (1997)
- Yoo, S. Y., "Effects of Angle of Attack on the Mass Transfer from a Square Cylinder and Its Base Plate", Int. J. of Heat and Mass Transfer, 36(2), pp.371~381 (1993)