Spanwise Heat Transport in Turbulent Channel Flow With Prandtl Numbers Ranging From 0.025 to 5.0
Spanwise Heat Transport in Turbulent Channel Flow With Prandtl Numbers Ranging From 0.025 to 5.0
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普朗特数范围为 0.025 至 5.0 的湍流通道流中的展向热传输
DOI：
10.1115/1.4005077
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and Takuya Kawabata
中科院分区：
文献类型：
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作者：
Koji Matsubara;Atsushi Sakurai;Takahiro Miura;and Takuya Kawabata
在普朗特数为0.025 ~ 5.0的范围内，直接求解了三个正交方向的近壁湍流热输运，验证了湍流热通量代数模型的正确性。在低雷诺数湍流中考虑了两种热情况：（a）展向热流均匀（UHF）的情况和（B）展向平均温度梯度（STG）的情况。在所测试的湍流热通量模型中，Rogers模型较好地预测了普朗特数的处理范围，但它未能非常准确地再现低普朗特数的影响。本文通过DNS建议的精确系数与普朗特数之间的相关性，揭示了Rotta模型的系数可以被修正以包括低普朗特数效应。
The near-wall turbulent heat transport of the three orthogonal directions was directly solved for the Prandtl numbers ranging from 0.025 to 5.0 to validate the algebraic models of the turbulent heat flux. Two kinds of thermal situations were considered in the low Reynolds number turbulent flow: (a) the case with a uniform heat flux in the spanwise direction (UHF) and (b) the case with the mean spanwise temperature gradient (STG). Among the turbulent heat flux models tested, the model of Rogers preferably predicted over the treated range of the Prandtl numbers, but it failed to reproduce the low Prandtl number effects very accurately. This paper revealed that the coefficient of the Rotta model can be modified to include the low Prandtl number effects by means of the correlation between the exact coefficient suggested by DNS and the Prandtl number.