流体工学部門講演会講演論文集
Online ISSN : 2424-2896
セッションID: 309
会議情報
0309 20kHz帯超音波を用いた新規粒子分級手法の開発
村松 浩也矢内 沙祐里水嶋 祐基齋藤 隆之
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会議録・要旨集 フリー

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Ultrasound techniques are applied in various fields such as washing, fine particle manipulation and solid-liquid separation. In the fine particle manipulation, ultrasonic ranging in MHz band is usually employed. Fine particles with μm order in diameter are treated because of limitations of the wavelength. In contrast, we discovered phenomena that mm-order particles dispersed in water are flocculated spherically by irradiating 20-kHz-band-ultrasound. In order to clarify the mechanism of this flocculation, we investigated the sound pressure profiles in the vessel, and the positions and diameters of the flocculated particle swarm, varying the water depth, ultrasound frequency and particle diameter. From these results, the particle swarm was trapped in the anti-node of the standing wave. The diameter of the particle swarm was dramatically changed by subtle control of the frequency. Based on these results, we will propose a new technique capturing and separating sub mm- or mm-order particles by their diameter.
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