In laminar-turbulent boundary layer transition under free-stream turbulence, streamwise velocity streaks develop from the leading edge of the flat plate. The present study focuses on heat transport phenomena near the transition location. In the present study, instantaneous fluctuations of velocity and temperature during the laminar-turbulent boundary transition were simultaneously measured with high time resolution using a triple-wire probe. The probe, composed of an X-type hot-wire anemometer and a cold wire, was traversed across the entire boundary layer to obtain spatially dense profiles. As the transition progressed, the wall-normal turbulent heat flux increased significantly in the near-wall region, and its peak location shifted farther away from the wall.
Kosugi et al. (Wed,) studied this question.