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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.

本文对竖直平板周围的自然对流流动和换热进行了理论分析和实验研究。主要关注的是从板所产生的热羽流的相互作用，也从板的局部传热的影响。为了分析板周围的流场和温度场，在封闭整个板的计算域中数值求解动量和能量输运的全椭圆方程。在室温下对空气和水以及2至6个垂直板的阵列进行了研究。结果表明，本文的椭圆分析方法能很好地预测羽流相互作用。分析结果还表明，当垂直板间距大于10mm（水）和20mm（空气）时，垂直板间的诱导流量随板数的增加而增加。此外，在板阵列的固定数量下，流量在板阵列的中心部分比在外部部分显示出更大的值。同时还测量了平板的局部换热系数，并与解析结果进行了比较。本文的分析结果与实验数据符合得相当好。在固定板间距的情况下，板的总传热系数随板数的增加而增加。此外，在固定板数的情况下，放置在阵列中心部分的板的系数显示出比放置在阵列外部部分的板的系数更高的值。这些结果表明，板对之间的流量强烈地依赖于板的数量和位置。这也导致板的传热系数的显著差异。