平面乱流衝突噴流熱伝達の直接数値シミュレーション : 上壁を有する場合の衝突距離による局所熱伝達率の影響(流体工学,流体機械)

概要

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The objectives of this study are to investigate the structures and characteristics of flows and heat transfer for plane turbulent impinging jets in a confined space, where a wall-jet type of flow is influenced by both lower (impingement) and upper walls, and to obtain turbulent statistics for the construction of a turbulent heat-transfer model. For these purposes, we have performed direct numerical simulations (DNS) of impinging flows with heat transfer. To obtain the effects of an impingement distance on heat transfer, the value of H is chasged in calculations, where H is the distance between the impingement wall and the upper wall. It is found from the present DNS that the Nusselt number increases with a decrease in the distance H similar to the experimental results. In addition, the Nusselt number of the case with the longest distance decreases monotonously in the wall-jet development direction, while the second peak of the Nusselt number is clearly observed away from the stagnation point in shorter distance cases, due to the increase in wall-normal turbulence intensities in the region away from the stagnation point.
一般社団法人日本機械学会の論文
2004-08-25