超音波音場中の気泡および固体粒子の挙動 : 円管内の沈降・浮上速度の測定(機械力学,計測,自動制御)

概要

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The behavior of solid spherical particles and air bubbles moving in an ultrasonic standing wave field are investigated experimentally. An ultrasonic transducer of 45 kHz is fixed at the part of the wall of the vertical square channel, and a standing wave field can be formed horizontally in this section. Several small pipes are inserted in this channel and particles and bubbles are dropped or raised into the pipes respectively. In the experiment for solid particles falling or rising in a liquid, the average terminal velocity in an ultrasonic field is slower than that in which there is no ultrasonic field. In the case of bubbles, the path of spherical bubbles in pipes strongly changes depending upon which position (node or antinode of sound pressure) in the standing wave field it passes. The rising velocity of non-spherical bubbles is faster than that of those with no ultrasonic application since the shape of bubble is deformed into a prolate ellipse by the ultrasonic radiation force and the drag coefficient of bubble decrease.
社団法人日本機械学会の論文
2003-01-25