Interaction of Natural Convective Flows Induced around Multiple Heat Sources and Its Influence on Heat Transfer

多个热源周围自然对流的相互作用及其对传热的影响

基本信息

批准号：
14550180
负责人：
KITAMURA Kenzo
金额：
$ 1.66万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550180/
关键词：
Convective Heat Transfer Natural Convection Heat Transfer Multiple Heat Sources Interaction of Plumes Numerical Analysis Vertical Plate Array Flow Visualization ブルームの干渉ブルーム干渉

项目摘要

Natural Convective flow and heat transfer around a row of vertical heated plates were investigated both analytically and experimentally. Main concerns are directed to an interaction of thermal plumes arising from the plates and also to its influence on the local heat transfer from the plates. In order to analyze the flow and temperature fields around the plates, full elliptic equations for the momentum and energy transport were solved numerically for the computational domain that encloses the whole plates. The investigations were carried out for air and water at room temperature and for the arrays of 2 to 6 vertical plates. The results showed that the present elliptic analysis well predicts the plume interaction. The analytical results also showed that the flow rates induced in between a pair of vertical plates increase with the number of plates when the gaps between the plates are larger than 10mm for water and 20mm for air. Moreover, the flow rates show larger values in the central portion of the plate array than in the outside portion under the fixed numbers of the plate arrays. The local heat transfer coefficients of the plates were also measured and they were compared with the analytical results. The present analytical results coincide fairly well with the experimental data. It was also found that the overall heat transfer coefficients of the plates increase with the number of the plate under the fixed gaps of the plate. Besides, the coefficients of the plates placed in the central portion of the arrays show higher values than those placed in the outer, portion of the arrays under the fixed number of the plates. These results depict that the flow rates in between the pairs of plates depend strongly on the numbers and situations of the plates. This also causes marked differences in the heat transfer coefficients of the plates.

分析和实验研究了一排垂直加热板周围的自然对流流和传热。主要关注点针对由板引起的热羽相互作用，也导致其对板上局部传热的影响。为了分析板周围的流量和温度场，对于封闭整个板的计算域，对动量和能量传输的完整椭圆方程进行了数值求解。调查是在室温和2至6个垂直板的阵列下进行空气和水进行的。结果表明，当前的椭圆分析很好地预测了羽流相互作用。分析结果还表明，当一对垂直板之间引起的流速随着板之间的间隙大于10mm的水，空气中的20mm大于10mm，而空气中的垂直板的数量会随着板的数量而增加。此外，流速在板阵列的中央部分显示的值大于固定数量阵列的固定数量。还测量了板的局部传热系数，并将其与分析结果进行了比较。目前的分析结果与实验数据相当一致。还发现，板的总体传热系数随板的固定间隙下的板数增加而增加。此外，放置在阵列中央部分的板的系数显示的值高于固定数量下的阵列的外部，部分中的一个板的系数。这些结果表明，板对之间的流速在很大程度上取决于板的数量和情况。这也导致板的传热系数有明显的差异。