期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 35, 期 6, 页码 920-932出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2011.01.011
关键词
Flow distribution; Heat exchanger; Header; Heated tube
资金
- University of Incheon
- National Research Foundation of Korea [핵C6A1106] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Refrigerant R-410a flow distribution is experimentally studied in a test section simulating a parallel flow heat exchanger having vertical headers with two pass configuration. Tubes are heated to yield a test section outlet superheat of 5 degrees C with inlet quality of 0.3. Mass flux is varied from 50 kg/m(2) s to 70 kg/m(2) S. Effects of inlet and outlet locations are investigated in a search for an optimum configuration. Results show that, significant liquid flows through bottom channels, and less liquid is supplied to top channels. As for the inlet location, better flow distribution (pressure drop as well) is obtained for top inlet as compared with middle inlet. As for the outlet location, top or bottom outlet is better than middle outlet. Correlations are developed for the fraction of liquid or gas taken off by downstream channel as a function of header gas Reynolds number at immediate upstream. The correlations may be used to predict the liquid or gas distribution in a parallel flow heat exchanger having vertical headers. A novel thermal performance evaluation method, which accounts for tube-side flow mal-distribution is proposed. (C) 2011 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据