Experimental study of natural convection heat transfer of air in a cube below atmospheric pressure

被引：13
|
作者：
Hirano, H
Ozoe, H
Okamoto, N
机构：
[1] Okayama Univ Sci, Dept Appl Chem, Okayama 7000005, Japan
[2] Kyushu Univ, Inst Adv Mat Study, Kasuga, Fukuoka 8168580, Japan
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2003年 / 46卷 / 23期
关键词：
natural convection; low pressure; pressure dependence;
D O I：
10.1016/S0017-9310(03)00275-8
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Experimental study was carried out on the temperature profile of natural convection of air in a 50 mm cube with the temperature difference of 30 K between two opposing vertical walls. The objective is to investigate the essential aspect of heat transfer in the wide range of Rayleigh number (Ra) by lowering the pressure. The pressure was varied from 5.40 kPa (40.5 mnHg) to 99.99 kPa (750.0 mmHg). These correspond to Ra=1.04x10(3) to 3.56x10(5). The results show that the temperature distribution and Nusselt number approach those of conduction state as the pressure decreases. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4483 / 4488
页数：6
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