期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 52, 期 -, 页码 146-155出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2013.09.005
关键词
Finned oval-tube heat exchanger; Cross flow; Air inlet angle; Experimental correlation
资金
- Natural Science Foundation of China for International Cooperation and Exchange [51120165002]
- Natural Science Foundation of China [51025623]
An experimental system was built to study the heat transfer and resistance characteristics of two finned oval-tube heat exchangers (HE1: Double rows of tubes, HE2: Three rows of tubes.) inclined towards the air incoming flow direction. Four air inlet angles (90 degrees, 60 degrees, 45 degrees and 30 degrees) are investigated separately to acquire the heat transfer and pressure drop performances for Reynolds number ranging from 1300 to 13,000. The experimental correlations of Nusselt number and resistance coefficient of the air side are obtained, and the comprehensive comparisons of heat transfer performance are carried out. The results show that whether the heat transfer performance for heat exchangers positioned obliquely is improved or not is depended on not only their inclined angles, but also their structures. (C) 2013 Elsevier Inc. All rights reserved.
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