AM06-16-004 気液混相流の渦崩壊に伴なう音波(波動・音・衝撃波(1),一般講演) [in Japanese] AM06-16-004 Acoustic Wave with Vortex Breakdown in a Gas-Liquid Multiphase flow [in Japanese]
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Acoustic sound is generated on the operation of microbble generator with vortex breakdown. In this study, source of the sound is assumed to be originated from oscillations of the gas column which is generated with centifugal force of strong swirling flow. Since wavelength of the sound in water is much larter than radius of the column, acoustic sound is calculated by solving equation of motion of incomplessible fluid in polar coordinate. Nonlinear equations for amplitude of velocity component of radial direction, and gas column displacement are determined. A linear dispersion relation between frequency of the sound and radius of the gas column is obtained by perturbation analysis.
日本流体力学会年会講演論文集 2006, 216, 2006