A numerical investigation of the temperature field in a turbulent flume is presented. We consider the effect of the Prandtl number on the convection velocity of temperature fluctuations in a turbulent boundary layer, and focus also on the effect of the Prandtl number on the connection between the velocity and the temperature fluctuations. Close to the wall, convection velocities of the temperature fluctuations decrease with an increase in the Prandtl number, i.e., the scale dependence becomes significantly important. In the region the relation of the convection velocity of the temperature fluctuation to that of the velocity fluctuation may be expressed as and for isothermal and isoflux wall boundary condition, respectively.
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Technical Notes
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