DNS of turbulent heat transfer in channel flow with respect to Reynolds and Prandtl number effects

被引：296

作者：

Kawamura, H ^{[1
]}

Abe, H

Matsuo, Y

机构：

[1] Sci Univ Tokyo, Dept Mech Engn, Noda, Chiba 2788510, Japan

[2] Natl Aerosp Lab, Chofu, Tokyo 1828522, Japan

来源：

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW | 1999年 / 20卷 / 03期

关键词：

DNS; turbulent heat transfer; channel flow; turbulent Prandtl number; time scale ratio;

D O I：

10.1016/S0142-727X(99)00014-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The direct numerical simulation (DNS) of turbulent heat transfer in a channel flow has been carried out to investigate the Reynolds and Prandtl number effects on the turbulent heat transport. The configuration is a fully developed turbulent channel flow with uniform heating from both walls. The Reynolds numbers based on the friction velocity and the channel half width are 180 and 395, and the molecular Prandtl numbers are 0.025, 0.2 and 0.71. The statistical quantities such as the temperature variance, turbulent heat fluxes, turbulent Prandtl number and the time scale ratio are obtained and the effects of the Reynolds and Prandtl numbers are examined. Budget terms of the temperature variance and the turbulent heat fluxes are also calculated. In addition, the instantaneous flow and thermal fields are visualized in order to investigate the structures of streaks and vortices. (C) 1999 Elsevier Science Inc. All rights reserved.

引用

页码：196 / 207

页数：12