Abstract
Statistical characteristics of turbulent heat transport in the thermal boundary layer of a drag-reducing surfactant solution flow in a two-dimensional channel have been experimentally studied, by simultaneously measuring the velocity and temperature fluctuations. Statistical analysis was carried out for the following terms : temperature fluctuations, turbulent heat fluxes in the streamwise and wall-normal directions, turbulence production of temperature variance, eddy diffusivities and turbulent Prandtl number. Influenced by the drag-reducing additives, the wall-normal turbulent heat flux was significantly depressed, causing depression of turbulent production of temperature variance and thermal eddy diffusivity.
