Abstract
An experimental study was performed of a flat plate turbulent boundary layer disturbed by insertion of a Large Eddy Break-Up (LEBU) plate with a vortex generator attached. The vortex generator was found to work well to augment the wall heat transfer over a large streamwise distance, although the LEBU plate alone causes deteoriations in both heat transfer and skin friction coefficients on the wall. To investigate the mechanism of the achieved heat transfer augmentation, time mean values and fluctuating intensities of three velocity components were measured. It is concluded that the heat transfer augmentation is mainly caused by the approach of lower temperature fluid from the free stream toward the near-wall region. This results from a downwash fluid motion induced by the longitudinal vortex. Heat transfer enhancement can also be achieved in the region where a upwash fluid motion is observed. Such enhancement is produced by the activated near-wall turbulence.
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