Abstract

In the subcritical Reynolds number range, the effect of aspect ratio (1〜8) on heat transfer characteristices under the tone-excitation impinged by a ellipse air jet has been studied experimentally. The main results are:(1) the position of axis-switching tends toward the downstream with the increase of aspect ratio. (2) For a larger aspect ratio, Cp and Nu under the tone-ecxitation added from the minor axis direction had small value and their profiles became flat, but those from the minor axis direction did not vary such as the results without tone-excitation.