EXPERIMENTAL MEASUREMENTS OF LARGE-SCALE TEMPERATURE-FLUCTUATION STRUCTURES IN A HEATED INCOMPRESSIBLE TURBULENT BOUNDARY-LAYER

Hot-wire anemometry measurements over a heated flat plate are made for three different temperature difference cases of 10, 15, and 20-degrees-C. Space-time correlations of temperature fluctuations T' are determined from which mean convection velocities, mean inclination angles, extent in space, and coherence characteristics of T' large-scale structure are calculated. The T' mean convection velocity is found as a function of y+. The T' structure inclination angle is 30 deg. The T' structure is limited to the viscous defect length in the normal and spanwise directions. However, in the streamwise direction, the structure is mildly dependent on the temperature difference.