DNS of heat transfer in turbulent and transitional channel flow obstructed by rectangular prisms

被引：9

作者：

Kawamura, Fusao ^{[1
]}

Seki, Yohji ^{[1
]}

Iwamoto, Kaoru ^{[1
]}

Kawamura, Hiroshi ^{[1
]}

机构：

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

来源：

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW | 2007年 / 28卷 / 06期

关键词：

direct numerical simulation; turbulent heat transfer; transitional channel flow; rectangular prism; three-dimensional obstacle;

D O I：

10.1016/j.ijheatfluidflow.2007.07.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Direct numerical simulation (DNS) of heat transfer in a channel flow obstructed by rectangular prisms has been performed for Re-tau = 80-20, where Re-tau is based on the friction velocity, the channel half width and the kinematic viscosity. The molecular Prandtl number is set to be 0.71. The flow remains unsteady down to Re, = 40 owing to the disturbance induced by the prism. For Re-tau = 30 and 20, the flow results in a steady laminar flow. In the vicinity of the prism, the three-dimensional complex vortices are generated and heat transfer is enhanced. The Reynolds number effect on the time-averaged vortex structure and the local Nusselt number are investigated. The mechanism of the heat transfer enhancement is discussed. In addition, the mean flow parameters such as the friction factor and the Nusselt number are examined in comparison with existing DNS and experimental data. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：1291 / 1301

页数：11

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