周期的圧力振動場における気泡の形状振動(混相流,一般講演)

概要

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Behaviors of bubble (s) in a row exhibiting shape oscillation under ultrasonic vibration are focused. Size of the bubbles interested in the present study is of O(1mm) in diameter. The bubbles were injected through the micro syringe to the test fluid filled in the rectangular tank. Water, water/surfactant mixture, and water/glycerin mixture were employed as the test fluids. Ultrasonic vibration up to 30W/cm^2 were irradiated to the bubble (s) after their detach from the syringe tip; thus the bubbles were exposed to the periodic acoustic field in rising the test fluid. The authors clearly detect radial and shape oscillations under the large-amplitude vibration by use of high-speed camera at the frame speed up to 100000fps. Preferable mode number of the shape oscillation and the transition process from the radial to the shape oscillation are discussed.
日本流体力学会の論文
2007-08-06