521 円柱周り気泡流下での抗力低減機構(混相流・自由表面を含む流れの諸問題II)(OS.7 混相流・自由表面を含む流れの諸問題)

概要

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In the present experimental conditions, the Reynolds number is corresponding to a sub-critical flow condition for single-phase flow. The laminar separation is disturbed by the passing bubble, and the separation is attached on the surface. This causes a backward shift of the separation point and the form drag is reduced. The following results ware also obtained from the photograph and the measurement of pressure distribution around the cylinder. The bubbles break up into small bubbles near the circular cylinder surface due to the strong shear stress in the boundary layer in the larger Reynolds number cases. The pressure distribution around the cylinder approaches to that of the super critical condition with the increase of void fraction.
一般社団法人日本機械学会の論文
2001-03-09