乱流要素渦と上昇気泡の相互作用(混相(3),一般講演)

概要

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The motion of a bubble in a simple vortex flow is examined by means of direct numerical simulations in order to understand the interactions between a rising bubble and a straight vortex tube whose vortex Reynolds number is comparable with those of elementary vortices in turbulence. We consider a small spherical bubble with a diameter of about one-half of the vortex diameter. It is found that the rising bubble interacts with the vortex in a different manner depending on the direction of the vortex relative to that of gravity. When the vortex oriented in the horizontal direction, the bubble is trapped in the vortex, preferably on the side with downward velocity due to the effect of the lift force. In the case where the vortex is oriented in the vertical direction, the rising bubble trapped in the vortex induces the upward motion of the vortex.
日本流体力学会の論文
2008-09-04