Abstract
Turbulent heat transfer mechanism in the thermal boundary layers developing a drag-reducing surfactant solution flow has been experimentally studied. A 2-component LDV and a fine-wire thermocouple probe were used to simultaneously measure the velocity and temperature fluctuations. A cationic surfactant solution, water/CTAC/NaSal system with 30ppm weight concentration of CTAC, was used as the working fluid for drag-reducing flow. From the simultaneous measurements of u, v and θ, the turbulence transport terms such as the Reynolds shear stress and turbulent heat fluxes in the streamwise and wall-normal directions, as well as the characteristics of the velocity and temperature field, were investigated.
