超音波場における均一微細気泡生成過程 : 第2報,均一気泡生成現象における安定生成条件(流体工学,流体機械)

概要

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The mechanism for the stable generation of micro gas bubbles of uniform diameter in an ultrasonic field was investigated experimentally. We produced micro gas bubbles of around 10μm diameter in various kinds of silicone oils and investigated the conditions of the stable generation of micro bubbles of uniform diameter by changing the inner diameter of a needle from 0.08 to 0.34mm, the frequency of ultrasonic waves of 18.77 and 42.15kHz, the kinematic viscosity from 5 to 100mm^2/s and the surface tension of 21 and 34mN/m. The results reveal that the conditions of the stable generation are affected by those properties of the liquid and dimensions of the needle. We also found that Weber number (We) and Womersley number (Wo) are controlling parameters for the stable generation, and found that micro bubbles of uniform diameter are generated stably under the conditions of We<300 and of 2<Wo<5.
社団法人日本機械学会の論文
2005-10-25