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Effect of a difference in the thermal boundary condition is examined for the turbulent channel flow. DNS was carried out for constant wall temperature difference condition for Reτ =180, 395 with Pr =0.71 to obtain statistical cross-correlation coefficients, turbulent Prandtl number, skewness factor and flatness factor. The obtained results are compared with those of an existing DNS for the uniform heat flux heating. A large difference was obtained in the skewness and flatness factors of the temperature variance for the two thermal boundary conditions.

Comparison of Scalar Turbulence Quantities through DNS of Turbulent Heat Transfer in a Channel Flow with Different Thermal Boundary Conditions