Periodic laminar flow and heat transfer in square channel

被引：0

作者：

Wang, Jiansheng ^{[1
]}

Xu, Yong ^{[1
]}

机构：

[1] Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, Tianjin University

来源：

Huagong Xuebao/CIESC Journal | 2013年 / 64卷 / 05期

关键词：

Channel; Heat transfer; Laminar flow; Periodic flow;

D O I：

10.3969/j.issn.0438-1157.2013.05.006

中图分类号：

学科分类号：

摘要：

A numerical investigation is conducted to examine laminar periodic flow and heat transfer characteristics in a square channel fitted with 45° inclined baffle inserted periodically in the channel. Air is the working fluid with the flow rate in terms of Reynolds number based on the channel hydraulic diameter ranging from 100 to 1000. The utilization of the 45° inclined baffles is to create counter-rotating vortex flows having a significant influence on the flow laminar intensity, enhancing heat transfer in the channel. Effects of different pitch ratios(PR=L/H) with a baffle height ratio(BR=b/H)of 0.2 on heat transfer and pressure loss in the channel were examined. The results show that the baffles create pair of vortex flows, inducing impingement flows on a side and the upper and lower walls and increasing heat transfer rate over the test channel substantially. An analysis on the averaged Nusselt number ratio, friction factor ratio and thermal enhancement factor with the change of pitch ratio and Reynolds number is used for establishing the corresponding criterion correlation. The computation reveals that the optimum thermal performance enhancement factor of about 3.0 is found at PR=0.5. © All Rights Reserved.

引用

页码：1541 / 1548

页数：7

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