超音波場における均一微細気泡生成過程 : 第1報,均一気泡生成に対する粘性の影響(流体工学,流体機械)

概要

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Instantaneous images of the fragmentation of capillary waves in an ultrasonic field were obtained by a high-speed video camera through a microscope at a frame rate of 500000 frames per second, revealing that micro bubbles of uniform diameter (about 12μm) can be generated at constant rate when a small amount of air was introduced into a highly viscous liquid whose kinematic viscosities are ranging from 10 to 50mm^2/s. We also investigated numerically to clarify the mechanism of the fragmentation of the capillary wave. Using the boundary element method, the generation process of bubbles was simulated and found to be stable in relatively highly viscous liquid. Consequently, the fragmentation of the surface wave was periodic in the highly viscous liquid and bubbles of uniform diameter were generated at a constant rate.
社団法人日本機械学会の論文
2004-11-25