Abstract
Direct numerical simulation of turbulent heat transfer in a channel flow through high spatial resolution has been carried out for Reτ =180, which is based on the friction velocity and the channel half width. The configuration is a fully developed turbulent channel flow with uniform heat flux heating from both walls. Molecular Prandtl numbers are set to be 0.71, 1.0, 2.0 and 10.0. The Prandtl number effect on the turbulence quantities such as turbulent Prandtl number, skewness and flatness factors of temperature derivatives are examined. Moreover, the resulting one-dimensional pre-multiplied energy spectra of temperature fluctuations at large wavenumbers are investigated to confirm the accuracy of the calculation.
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