Fluid Flow anf Heat Transfer Characteristics for Arrays of Heated Blocks

加热块阵列的流体流动和传热特性

基本信息

批准号：
05650202
负责人：
ASAKO Yutaka
金额：
$ 1.41万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650202/
关键词：
Convection heat transfer Low-Reynolds number Cooling of LSI Transition to turbulent

项目摘要

The flow visualization was done for low Reynolds number fluid flow in an array of the heated square blocks deployed along one wall of the parallel plates duct. This configuration simulates the forced-convection cooling of printed circuit boards encountered in large scale integrated elements. The pearl graze was used for the flow visualization as a tracer. The geometry of the problem is specified by the block dimension (L), the block thicknes (B) , the inter-block gap (S) and the height of the flow passage between the block and the opposite wall of the duct ( H). The experiments were done for B/L=3/8, S/L=1/4, H/L=1/4 to 5/8. The critical Reynolds numbers obtained from the flow visualization were 1000 to 1500 depending on the height of the duct.Three-dimensional numerical analysis were conducted to obtain the fluid flow and heat transfer characteristics in both th periodic fully developed region and the entrance region of the array of the heated blocks for the range of Reynolds number from 1900 to 5000. Lam and Bremhorst low-Reynolds-number two equation model was used for the turbulent model. The results for the entrance region were compared with the experimental results. The result for the periodic fully developed region was published in the Numerical Heat Transfer and the result for the entrance region was accepted for publication in the same journal.Three-dimensional numerical analysis for the transition region of Reynolds number ranges from 100 to 2500 were conducted with using Lam-Bremhorst low-Reynolds-number two equation turbulence model to obtain the fluid flow and heat transfer characteristics in the transition region. The duct geometries tested were B/L=3/8, S/L=1/4 and H/L=1/4 to 5/8. As a consequence, in the case of H/L=5/8, the transition to the turbulent flow starts from Re=700.

对于沿平行板管的一个壁部署的加热正方形块的阵列中，对低雷诺数流动流进行了流动可视化。这种配置模拟了以大规模集成元素遇到的印刷电路板的强制转向冷却。珍珠放牧用于流动可视化作为示踪剂。问题的几何形状由块尺寸（l），块厚（b），块间间隙（S）以及管道（H）的相对壁之间的流量高度指定。对B/L = 3/8，S/L = 1/4，H/L = 1/4至5/8进行实验。根据管道的高度，从流量可视化获得的临界雷诺数为1000至1500。进行了三维数值分析，以获得液体流量和全周期性开发区域的流体流量和热传递特性，以及雷诺（Reynolds）范围范围为1900至5000的范围范围的范围，并获得了雷姆（Reynolds）范围。用于湍流模型。将入口区域的结果与实验结果进行了比较。 The result for the periodic fully developed region was published in the Numerical Heat Transfer and the result for the entrance region was accepted for publication in the same journal.Three-dimensional numerical analysis for the transition region of Reynolds number ranges from 100 to 2500 were conducted with using Lam-Bremhorst low-Reynolds-number two equation turbulence model to obtain the fluid flow and heat transfer characteristics in the transition region.测试的管道几何形状为B/L = 3/8，S/L = 1/4和H/L = 1/4至5/8。结果，在H/L = 5/8的情况下，向湍流的过渡从RE = 700开始。