Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 11, 2020 - November 13, 2020
In order to improve the heat transfer performance of industrial applications, impinging jets are used. A single impinging jet produces a high heat transfer rate around an impinging position on an impinging wall, while the heat transfer performance decays increasing distance from the impinging position. Thus, in order to overcome the shortcoming of single impinging jet such as the occurrence of both inhomogeneous heat distribution on the wall and the narrow heating area, multiple impinging jets in which multiple jets are arranged are used. However, multiple impinging jets have a problem that heat transfer characteristics become unevenness because adjacent jets form a complicated flow field. In this paper, to reduce the unevenness, a oscillation control in which nozzle is moved along the row direction at a sin cycle is proposed. Then, using DNS (Direct Numerical Simulation) and DMD (Dynamic Mode Decomposition), we investigate the effects of oscillation control on the dynamic flow structure of multiple impinging jets with varying oscillation frequency and its amplitude. As a result, the uniformity of the velocity distribution near the wall surface is improved by performing oscillation control.
