Discussion of high-Prandtl number effect on inner layer turbulent heat flux in high-Reynolds number channel flows

被引：0
作者：
Saruwatari, Shogo [1 ]
Yamamoto, Yoshinobu [1 ]
机构：
[1] Dept. of Mechanical Systems Engineering, University of Yamanashi, Kofu, Yamanashi, 400-8511, 4-3-11, Takeda
来源：
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2013年 / 79卷 / 808期
关键词：
Channel flow; DNS; High-Prandtl number; Turbulent heat transfer;
D O I：
10.1299/kikaib.79.2846
中图分类号：
学科分类号：
摘要：
Prandtl number (Pr) effects on characteristics of the thermal boundary layer were investigated by means of Direct Numerical Simulations (DNS) in high-Reynolds number turbulent channel flows. The molecular Pr conditions were changed from 0.71 to 25.0, and the Reynolds number based on the friction velocity and channel half-width was kept to 1000 in all cases. In the thermal conduction sub-layer and logarithmic layer, despite difference of Pr, Joint probability density function (JPDF) profiles of the wall-normal turbulent heat flux were shown good agreements with JPDF profiles of the Reynolds shear stress. On the other hand, in the peak wall-normal height of streamwise velocity intensities, JPDF profiles of wall-normal turbulent heat flux were influenced on Pr. In fact, the temperature fluctuations increase with increase of Pr at this wall-normal position. This is caused from high-Pr effects such as the difference between velocityand thermal boundary thicknesses and low-thermal conductivity. © 2013 The Japan Society of Mechanical Engineers.
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页码：2846 / 2858
页数：12
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