Study of heat transfer mechanism from the rib-roughened heated plate to the flowing air

The paper presents an investigation of heat transfer mechanism from a rib-roughened plate to the flowing air, based on the measurements taken in a special small-size wind tunnel with a rectangular cross section flow channel. The heated ribbed wall was located at the channel bottom. The air flow, caused by a suction fan, was steady or pulsating ( the Reynolds number varied from 1000 to 11300). Advanced measurement techniques were used, such as schlieren video film, PIV and hot wire thermoanemometry (for simultaneous measurements of instantaneous velocity and temperature). They allowed to analyze the movement of vortices structure and to evaluate the coherence values of instantaneous temperature records made in the chosen points of the air flow.