Spanwise Heat Transport in Turbulent Channel Flow With Prandtl Numbers Ranging From 0.025 to 5.0

作者：Matsubara Koji^*; Sakurai Atsushi; Miura Takahiro; Kawabata Takuya

来源：Journal of Heat Transfer-Transactions of the ASME, 2012, 134(4): 041701.

DOI：10.1115/1.4005077

• turbulent heat transfer
• Prandtl number
• turbulent heat flux model
• direct numerical simulation

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. [DOI: 10.1115/1.4005077]

• 出版日期2012-4