Abstract
Several direct mumerical simulations (DNS's) have been performed for the turbulent heat transfer in a channel flow. The coupling of the velocity and thermal fluctuations causes a turbulent heat flux. In the present study, the effect of a difference in a thermal boundary condition is examined. Two DNS's were carried out for constant wall heat flux and constant wall temperature difference conditions with Pr=0.71 and 0.025 to obtain statistical quantities such as mean temperature, temperature variance, turbulent heat flux and their budget terms. A mixing length approximation is applied to analyse the relation between the mean temperature and the turbulent heat flux profiles. The effect of difference in the thermal boundary condition is discussed.
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