期刊论文详细信息
Applied Sciences
Experimental Study of Condensation Heat Transfer and Pressure Drop inside a Small Diameter Microfin and Smooth Tube at Low Mass Flux Condition
Keishi Kariya1  Akio Miyara1  Keisuke Nakamura2  M.Khairul Bashar2 
[1] Department of Mechanical Engineering, Saga University, 1 Honjomachi, Saga 840-8502, Japan;Graduate School of Science and Engineering, Saga University, 1 Honjomachi, Saga 840-8502, Japan;
关键词: microfin tube;    condensation;    heat transfer coefficient;    pressure drop;    R134a;   
DOI  :  10.3390/app8112146
来源: DOAJ
【 摘 要 】

This study was made to investigate the condensation local heat transfer and adiabatic pressure drop of R134a inside a 2.5 mm outside diameter smooth and microfin tube at low mass flux condition. Data were measured for mass fluxes from 50 to 300 kg m−2s−1, vapor qualities from 0 to 1 and saturation temperatures from 20 to 30 °C. The effects of mass flux, vapor quality, saturation temperature, microfin and diameter of test tube were analyzed. The pressure drop of the microfin tube was about 1.5 times higher than that of the smooth tube at mass flux 50 kg m−2s−1. The heat transfer coefficient of the microfin tube was about 2⁻5 times higher than that of the smooth tube at mass flux 100 kg m−2s−1. Experimental results were also compared with typical correlations. For the microfin tube, however, all the existing correlations do not adequately predict the present data. Poor predictions may be attributed to the lack of the small diameter microfin tube with low mass flux data in their database. Hence, it is essential to develop a condensation and pressure drop correlation for the small diameter microfin tube at low mass flux condition.

【 授权许可】

Unknown   

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