| 环形通道内层流入口段换热及流体变物性的影响 |
| |
| 引用本文： | 谢公南,王秋旺,陶文铨. 环形通道内层流入口段换热及流体变物性的影响[J]. 化工学报, 2005, 56(8): 1403-1408 |
| |
| 作者姓名： | 谢公南 王秋旺 陶文铨 |
| |
| 作者单位： | 西安交通大学动力工程多相流国家重点实验室,陕西 西安 710049 |
| |
| 基金项目： | 国家自然科学基金项目（59806011）;教育部霍英东教育基金会高等院校青年教师基金项目（91056）. |
| |
| 摘 要： | 采用SIMPLER算法对环形通道内二维定常轴对称入口段流动与换热进行了数值计算， 研究了两种边界条件下的层流流动与换热规律， 给出了不同Prandtl数以及半径比率下沿程Nusselt数的变化曲线，同时还给出了流体物性随温度变化对流动与换热的影响， 最后还拟合出了不同半径比率下平均Nusselt数的关联式.计算结果还表明，环形通道能强化传热，强化程度随半径比率减小而增大，且入口段的换热强化与其较高的径向速度有关.
|
| 关 键 词： | 层流换热 入口段 环形通道 变物性 |
| 文章编号： | 0438-1157（2005）08-1403-06 |
| 收稿时间： | 2004-07-09 |
| 修稿时间： | 2004-07-092004-09-13 |
Laminar heat transfer inside concentric annular duct in entrance region and effects of variable fluid properties |
| |
| XIE Gongnan,WANG Qiuwang,TAO Wenquan. Laminar heat transfer inside concentric annular duct in entrance region and effects of variable fluid properties[J]. Journal of Chemical Industry and Engineering(China), 2005, 56(8): 1403-1408 |
| |
| Authors: | XIE Gongnan WANG Qiuwang TAO Wenquan |
| |
| Abstract: | Laminar flow and heat transfer characteristics of concentric annular duct in the entrance region were numerically investigated by solving two-dimensional steady-state incompressible Navier-Stokes equations. SIMPLER algorithm was used for computation under two boundary conditions. Variations of local Nusselt numbers along axial distance vs Prandtl numbers and radius ratios, as well as the variations due to the effects of variable fluid properties on flow and heat transfer were presented. The correlations of average Nusselt number with Reynolds number, Prandtl number and l/D were also obtained for different radius ratios. It was also found that the annular duct could be used to enhance heat transfer, especially at lower radius ratio. In addition, the higher heat transfer coefficients in the entrance region might also attribute to the higher radius velocity component in this region. |
| |
| Keywords: | laminar heat transfer entrance region annular duct variable property |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《化工学报》浏览原始摘要信息 |
|
点击此处可从《化工学报》下载免费的PDF全文 |
