Heat Transfer Symmetry of the Strip Surface Due to Agroup Oblique Slot Jet Impingement After Hot Rolling

The objective of the study is to determine the heat transfer symmetry of a single group oblique slot jet impingement for high temperature strip. The influence of the jet velocity of fluid inlet (V), the jet angle (theta), the ratio of fluid inlet to the top and bottom surface spacing (H), and the width of the fluid inlet (W) was investigated numerically. The velocity streamline of the flow domain, the local Nusselt number of the top and bottom surface and the coordinate values of stagnation point are obtained. The results indicate that, the average Nusselt number of the upstream region decreases by about 7.2-53.1% with the increase of theta, which is in the downstream region mildly decreases by about 2.8-14.5% for various combinations of V and H. The discrepancy of average Nusselt number for the top and bottom surface monotonically decreases by about 26-117% with the increase of jet velocity from 1.5 to 4 m/s, and increases by about 4-116% with the increase of jet angle from 25 to 45 degrees. The functional relationship between the systematic parameters and the discrepancy of the average Nusselt number or the coordinate values of stagnation point is derived.