B213 キャビティ内を掃引する粘弾性流体の流動特性に関する数値計算(B-21 非ニュートン流体(1),一般講演)

概要

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A two-dimensional numerical study on visco-elastic fluid flow sweeping a cavity has been performed in order to find the optimum geometric condition for heat transfer augmentation technology on the bottom wall of the cavity by using Barus effect. In this paper, the effect of the cavity streamwise length, L[m], on stress fields is focused in the range from 2.5, 5 and 10 times of the cavity depth, H[m], while the solvent Reynolds number and the rib height Weissenberg number are kept constant at 100 and 0.025, respectively. From the results, it is found that the flow penetration into the cavity effectively occur just at the inlet of the cavity in the cases of visco-elastic fluids, whilie a large recirculating region is formed there for the cases of Newtonian fluid. From the fact that the rib distance Weissenberg number is enough low, the flow separation experimentally observed in thedownstream region of cavity does not occur in the present srudy. As the enough high elasticity is required for Barus effect occurrence, the optimum condition is found to exist for the heat transfer augmentation.
日本流体力学会の論文
2004-08-09