Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-liquid Mixture (1st Report, Horizontal Irradiation in Stationary Solid-liquid Mixture)

Ohta, Junichi; Makara, Takashi; Hirobe, Seisuke

doi:10.1299/kikaib.71.125

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…6. The occurrence of particle clump aggregation was reported in the previous reports (19) (20) . According to the previous reports, many particles aggregate and form a particle clump due to flows of cavitation clouds.…”

Section: Particle Clump Aggregationsupporting

confidence: 60%

“…From the pressure profiles for tap and degassed water presented by the authors (see Fig. 6 in the previous report (19) (20) ), the two pressure profiles along the Z direction for f = 23.0 kHz were approximately same. Figure 10 shows sound pressure profiles for degassed water in the Y direction at f = 23.0 kHz.…”

Section: Sound Pressure Profiles 331 Z Directionmentioning

confidence: 58%

“…As mentioned above, there are many factors that affect particle behavior in a liquid subjected to ultrasonic waves. However, in the previous study (19) (20) , the experimental conditions which was done by one of the authors were limited.…”

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

“…However, the effects of ultrasound on the behavior of fine solid particles are not yet understood sufficiently for relatively large acoustic transducers. Therefore, in a previous study, we investigated particle behavior using a rectangular plate type (10 cm×10cm) acoustic transducer (19) (20) . One of the present authors found aluminum particles with diameters of 50-150 μm to aggregate into a "particle clump" when acoustic cavitation occurs at a frequency of f = 23 kHz.…”

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

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Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-Liquid Mixture (Classification of Particle Aggregation and Sound Pressure Profiles under Horizontal Irradiation)

Ohta

Nakano

2008

JFST

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Particles in a liquid under standing ultrasonic waves have been known to aggregate. However, particle aggregation behavior remains unclear. Thus, ultrasonic waves horizontally irradiated particles in tap water or degassed water with a relatively large disktype acoustic transducer. We observed the particle behavior and measured the sound pressure profiles. The following results were obtained. The behavior of particles in water under ultrasonic waves was classified as "band", "point", "particle clump", and "non-aggregation". Experimental conditions producing "band", "point", "particle clump", and "non-aggregation" in tap water were found to be different from those in degassed water. Moreover, the point aggregations at a frequency f of 96.3 kHz were observed at many more locations (higher spatial density) than those at a frequency f of 23 kHz. The sound pressure profile for f = 96.3 kHz had many more peaks than that for f = 23 kHz in the vertical direction, which corresponds to the spatial densities of the point aggregation.

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Section: Particle Clump Aggregationsupporting

confidence: 60%

Section: Sound Pressure Profiles 331 Z Directionmentioning

confidence: 58%

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

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Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-Liquid Mixture (Classification of Particle Aggregation and Sound Pressure Profiles under Horizontal Irradiation)

Ohta

Nakano

2008

JFST

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“…As mentioned above, particles in a liquid are known to be aggregated as bands under ultrasonic standing waves; however, one of the authors revealed that particles in water under ultrasonic waves generated by a circular-plate acoustic transducer can be aggregated as a band, point, particle clump, or non-aggregation, depending on the experimental conditions (Ohta, 2005) (Ohta,2007), (Ohta, 2008). Acoustic streaming generated by progressive waves can take particles away from a solid-liquid mixture.…”

Section: Introductionmentioning

confidence: 99%

Velocities of acoustic streaming in a solid-liquid mixture generated by an ultrasonic wave (Particles and particle concentration)

Ohta

Iguchi

Onaru

2014

JFST

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Progressive ultrasonic waves cause acoustic streaming in a liquid. Although theoretical and experimental studies on acoustic streaming for liquid phase have been carried out, acoustic streaming for a solid-liquid mixture does not seem to have been investigated. The purpose of this study is to clarify the velocity distribution of acoustic streaming in a solid-liquid mixture. An ultrasonic wave with a frequency of 485 kHz was horizontally irradiated on tap water with aluminum particles in a cylindrical tube with a diameter of 120 mm whose orientation was kept horizontal; the acoustic streaming velocities were measured with the irradiation time of the ultrasonic wave, initial particle concentration, and particle shape as the parameters. The following results were obtained: (a) The higher the initial particle concentration is, the faster the acoustic streaming velocity of a solid-liquid mixture becomes; (b) When ultrasonic waves are irradiated on a liquid with heavier solid particles, the acoustic streaming velocity of the solid-liquid mixture decreases with irradiation time to a certain extent.

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An innovative unit operation of particle separation/classification by irradiating low‐frequency ultrasound into water

Muramatsu

Saito

2017

AIChE Journal

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By irradiating kHz-band ultrasound, submillimeter-or millimeter-size particles that were dispersed in water with dissolved gases flocculated into a spherically flocculated particle swarm (SFPS). Acoustic cavitation-oriented bubbles caused by the irradiation played essential roles in the formation of the SFPS. Unprecedented and promising phenomena were observed: the particles were separated based on their diameters through the precise control of the ultrasound irradiation, and the SFPS was easily manipulated using a motion-controlled stick. The relationship between the soundpressure profiles and the manipulable range of the SFPS is discussed; that is, the effectively manipulable range was limited by the sound-pressure profile. By means of manipulation control, we demonstrate the particle classification by particle diameters. On the basis of these findings, an example of a practical application of this technique is proposed.

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Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-liquid Mixture (1st Report, Horizontal Irradiation in Stationary Solid-liquid Mixture)

Cited by 3 publications

References 5 publications

Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-Liquid Mixture (Classification of Particle Aggregation and Sound Pressure Profiles under Horizontal Irradiation)

Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-Liquid Mixture (Classification of Particle Aggregation and Sound Pressure Profiles under Horizontal Irradiation)

Velocities of acoustic streaming in a solid-liquid mixture generated by an ultrasonic wave (Particles and particle concentration)

An innovative unit operation of particle separation/classification by irradiating low‐frequency ultrasound into water

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