| Rib height selection for roughness-enhanced tube |
| |
| 作者姓名： | HUANG Wei-jun DENG Xian-he ZHOU Shui-hong |
| |
| 作者单位： | The Key |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 1 Introduction A well known method to increase heat transfer from a surface is to roughen the surface by use of regular geometric roughness elements, such as transversely-ridged tube, spirally-ridged tube or converging-diverging tube, etc., on the surface…
|
| 关 键 词： | 粗糙管 边界层理论 光滑管 肋条 高度 |
| 文章编号： | 1671-8224（2006）01-0008-05 |
| 收稿时间： | 2005-06-17 |
| 修稿时间： | 2005-12-27 |
Rib height selection for roughness-enhanced tube |
| |
| HUANG Wei-jun DENG Xian-he ZHOU Shui-hong.Rib height selection for roughness-enhanced tube[J].Journal of Chongqing University,2006,5(1):8-12. |
| |
| Authors: | HUANG;Wei-jun;DENG;Xian-he;ZHOU;Shui-hong |
| |
| Abstract: | In this study we proposed a method of selecting preferred rib height of roughness-enhanced tubes by combining the boundary layer district theory with Blasius friction correlation. This method calculates the thickness of every layer for the smooth tube, which is helpful in determining the range of optimum roughness size for roughen-surface enhanced tubes. We computed the flow and heat transfer in these optimum tubes by numerical simulation, investigated the three ways of performance evaluation criteria, and selected the best rib height by directly choosing the tube which had the highest heat transfer efficiency. For the air flow at Re number 10 000 in a converging-diverging tube with a 44 mm inner diameter, the optimal rib height is in the range from 1.6 mm to 2.4 ram; and in a transversely-ridged tube with an inner diameter of 34 ram, from 1 .0 mm to 1.5 mm. The preferred rib height changes with flow Re number, fluid properties, and inner diameter of tube, also varies with the tube shape. However the tube shape does not exert so much impact as other factors. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《重庆大学学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《重庆大学学报(英文版)》下载免费的PDF全文 |
