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Effects of Ultrasound on Behavior of Fine Solid Particles in a Solid-Liquid Mixture (Horizontal Irradiation in a Stationary Solid-Liquid Mixture)

机译：超声波对固液混合物中细小固体颗粒行为的影响（固定固液混合物中的水平辐照）

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摘要

In a solid-liquid two-phase flow,the separation of particles or a reduction of particle concentration is often desired. Utilization of ultrasound has been considered as one technique for the separation of particles. Particles are known to aggregate due to the radiation pressure of ultrasound. However,the effect of ultrasound including cavitation on particle behavior is not well understood. Thus,we horizontally irradiated water with aluminum particles having a density of 2720 kg/㎥ and diameters of 50 to 150 µm or smaller aluminum powder(flakes)in a rectangular vessel by ultrasound at frequencies of 23 kHz or 100 kHz. In this way,a standing wave was formed. The following results were obtained. For ultrasound of 100 kHz,the aluminum powder aggregates in vertical bands. When acoustic cavitation existed at the frequency of 23 kHz,we noticed that the aluminum particles aggregate as clumps near antinodes of the sound pressure profile because of the flow induced by acoustic cavitation. When the particles are continuously provided in a relatively high concentration,particle clumps form and remain. Then,the particle clumps become larger and suddenly fall faster than the surrounding small particles. Such phenomena repeat themselves periodically. At relatively low concentrations,particle climps do not become large and remain stationary at the same positions.
机译：在固液两相流中，经常需要分离颗粒或降低颗粒浓度。超声波的利用已被认为是分离颗粒的一种技术。由于超声波的辐射压力，已知粒子会聚集。然而，包括空化作用在内的超声对颗粒行为的影响尚不十分清楚。因此，在矩形容器中，以23kHz或100kHz的频率，对矩形容器中的密度为2720kg / l，直径为50〜150μm或更小的铝粉（薄片）的铝粒子水平地照射水。这样，就形成了驻波。获得了以下结果。对于100 kHz的超声波，铝粉会在垂直带中聚集。当声空化以23 kHz的频率存在时，我们注意到，由于声空化引起的流动，铝颗粒在声压分布的波腹附近聚集为团块。当以相对较高的浓度连续提供颗粒时，颗粒团块形成并保留。然后，粒子团块变得更大，并且突然比周围的小粒子下降得更快。这种现象会定期重复发生。在相对较低的浓度下，颗粒附着不会变大，并且在相同位置保持静止。

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