Taylor and Francis Ltd.;Philadelphia, PA: Taylor & Francis Group
摘要:
摘要： This study provides an experimental analysis on the heat transfer performance of a flat aluminum tube microchannel heat exchanger with spray cooling. The effects of water spraying rate, airflow rate, and relative humidity were investigated. The test results show that the heat transfer performance increased with increasing the water spraying rate but without the penalty of increased flow resistance at low spray conditions. This effect is further enhanced by increasing the water spraying rate. However, when the spraying rate is high, part of the nonevaporated drops attached to the fin surface and formed a liquid film, which caused the flow passage to become narrower. Further increase in the spraying rate resulted in part of the flow passages being blocked by the nonevaporated water drops and caused a region of poor heat transfer. The friction coefficient jumped drastically at this condition. This phenomenon deceased gradually with increasing airflow rate. High inlet air humidity resulted in the water accumulation phenomenon appearing at lower water spraying rates. The evaporative cooling effect decreased and flow friction increased. The test results just described show that the water spray is able to significantly improve the air-side heat transfer performance. The optimum spray rate for each airflow rate must be carefully determined. 出版者： Philadelphia, PA: Taylor & Francis Group 出版日期： 2013-01-01 出處： Heat transfer engineering, 2013-01, Vol.34 (1), p.29-36 資源來源： EBSCOhost Academic Search Premier 版權： Copyright Taylor & Francis Group, LLC 2013 版權： 2014 INIST-CNRS 版權： Copyright Taylor & Francis Ltd. 2013 識別號： ISSN: 0145-7632 識別號： EISSN: 1521-0537 識別號： DOI: 10.1080/01457632.2013.694742 識別號： CODEN: HTEND2
