Effect of frequency ratio of inclined rotating control on the flow characteristics of impinging jet using DNS

Abstract

Since the heat transfer performance of the impinging jets decreases rapidly away from the stagnant region, it is necessary to eliminate the non-uniform heat transfer distribution and to increase the heat transfer area. It has been shown that the combination of inclined and rotating control of the jet and axial excitation produces a bifurcation structure of the jet characteristic of blooming jets, resulting in high mixing performance. In addition, the DNS of this blooming jet when it is impinged on a wall reveals that the Nu number distribution and the heat transfer distribution change significantly depending on the impinging distance. Therefore, this study investigates the flow characteristics and heat transfer performance when the frequency ratio is varied in addition to the impingement distance.