標題: Characteristics of flow distribution in compact parallel flow heat exchangers, part I: Typical inlet header
作者: Wang, Chi-Chuan
Yang, Kai-Shing
Tsai, Jhong-Syuan
Chen, Ing Youn
機械工程學系
Department of Mechanical Engineering
關鍵字: Flow distribution;Header;Parallel flow heat exchangers
公開日期: 1-十一月-2011
摘要: This study experimentally and numerically investigates the single-phase flow into parallel flow heat exchangers with inlet and outlet rectangular headers having square cross section and 9 circular tubes. The effects of inlet flow condition, tube diameter, header size, area ratio, flow directions (Z and U-type), as well as the gravity are investigated. The experimental results indicate that flow distribution for U-type flow is more uniform than Z-type flow. Depending on the inlet volumetric flow rate, the flow ratio at the first several tubes can be lower than 50% of the last tube for Z-type arrangement, and this phenomenon becomes more and more pronounced with the rising velocity at the intake conduit. The mal-distribution can be eased via reducing the branching tube size or increasing the entrance settling distance at the intake conduit. It is found that the influence of gravity on mal-distribution is negligible and the mal-distribution is associated with the jet flow pattern. (C) 2011 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.applthermaleng.2011.06.004
http://hdl.handle.net/11536/18409
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2011.06.004
期刊: APPLIED THERMAL ENGINEERING
Volume: 31
Issue: 16
起始頁: 3226
結束頁: 3234
顯示於類別:期刊論文


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  1. 000295115100016.pdf