多孔泡沫金属换热器内流体的流动和传热分析.pdf

文档介绍：π
π
第 2 1 卷第 2 期石油化工高等学校学报 Vol . 2 1 No . 2
2008 年 6 月 JOURNAL OF PETROCHEMICAL UNIV ERSITIES J un. 2008
文章编号:1006 - 396X(2008) 02 - 0080 - 04
多孔泡沫金属换热器内流体的流动和传热分析
李菊香1 , 涂善东2
(1. 南京工业大学能源学院,江苏南京 210009 ; 2. 华东理工大学,上海 200237)
摘要: 对管间填充多孔泡沫金属的方形管壳式换热器内流体沿管间轴向强制层流的流动和恒热流密度的
传热进行了理论研究。结果表明,流体的径向速度分布呈现类似于光管内湍流时近壁处薄层内变化率大,其余大部
分区域平坦的特征;流体和泡沫的径向温度分布较为平坦;流体的压力降随泡沫孔数(ppi) 增大的增长明显大于对流
换热的 N u 数随 ppi 数增大的增长;泡沫的孔隙率越小,流体的压力降越大,对流换热的 N u 数也越大。
关键词: 多孔泡沫金属; 管壳式换热器; 流动; 传热
中图分类号: TB383. 4 ; T K124 文献标识码: A
Analysis on Flow and Heat Transfer of Fluid in
Porous Metal Foam Heat Exchanger
L I J u - xiang1 , TU Shan - dong2
(1. Energy of College , N anj ing University of Technology , N anj ing J iangsu 210009 , P. R. China;
2. East China University of Science and Technology , S hanghai 210037 , P. R. China)
Received 27 September 2007 ; revised 10 M arch 2008 ; accepted 20 A p ril 2008
Abstract : The flow and heat transfer under the constant heat flux condition of fluid s outside the tube forced laminar flow
along the tube axis in a quadrate tube - shell type heat exchanger fitted with porous metal foam in shell side was theoretically
analyzed. It shows that the flow velocity distribution in the radial direction is similar to the situation of fluid s internal turbulent
flow inside a blank tube with the feature of having great gradient in a very thin layer nea