Flow and Heat Characteristics on Circular Impinging Jet Added Annular Suction Flow

The Case Where Impinging Wall is Placed in Transition and Development Region of Free Jet

Abstract

The existence of the improvement of cooling characteristics of the heating wall plane by circular impinging jet in adding the annular suction flow was examined. Following the previous report, the experiment was carried out on the case where the impinging wall was placed in transition and development region of circular free jet. As the result, in the transition region, there is the improvement of Nusselt number, when there is the suction flow in comparison with the case in which there is no suction flow. In the meantime, there is no improvement in the development region. It is proven that there is the close relation with fluctuating velocity and average flow rate using PIV on these heat transfer characteristics.