Particle Removal By Focused Ultrasound

Brereton, G. J.; Bruno, Bradford A.

doi:10.1006/jsvi.1994.1253

Cited by 18 publications

(8 citation statements)

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“…Typical removal events are shown in the companion videotape to Brereton and Bruno [5]. The relative insensitivity of this effect to distance from the beam focus suggested that streaming might drive this effect.…”

Section: B Comparison With Experimentsmentioning

confidence: 94%

“…The extreme importance of the van der Waals force to micron particle removal can be appreciated by comparing its size with the gravitational force on a spherical particle, which is given by (5) For particles on the order of a micron, !…”

Section: A Van Der Waals Forcementioning

confidence: 99%

“…Efficiencies were measured as functions of particle size, excitation frequency, acoustic power density, and exposure time. Experiments conducted with point-focused ultrasound have been carried out by Brereton and Bruno [5] who constructed a gigahertz system which allowed observation of particle removal events (Fig. 3).…”

Section: B Comparison With Experimentsmentioning

confidence: 99%

“…The relative insensitivity of this effect to distance from the beam focus suggested that streaming might drive this effect. Streaming patterns have been computed by Brereton and Bruno [5] using a decomposition by the method of successive approximations and a spherical model for the acoustic beam, leading to the patterns shown on the right of Fig. 4.…”

Section: B Comparison With Experimentsmentioning

confidence: 99%

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Mechanisms of removal of micron-sized particles by high-frequency ultrasonic waves

Brereton

1995

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, theories of particle removal by highfrequency ultrasonic waves are discussed and tested against recent experimental data. First, the principal adhesion forces such as van der Waals forces are briefly reviewed and the typical uncertainties in their size in particle-surface systems are assessed. The different ultrasound-induced forces-linear forces such as added mass, drag, lift, and Basset forces and nonlinear ones due to radiation pressure, and drag exerted by acoustic streaming-are discussed and their magnitudes are evaluated for typical cleaning operations. It is shown that highfrequency ultrasound can clean particles most effectively in media with properties like water because: (1) the wavelength can be made comparable to the particle radius to promote effective sound-particle interaction; (2) the viscous boundary layer is thin, minimizing particle "hide-out;" and (3) both the added mass and radiation pressure forces exceed typical adhesion forces at high frequencies. Based on these analyses, possible mechanisms of particle removal are discussed and interpreted in terms of experimental observations of particle cleaning.

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Section: B Comparison With Experimentsmentioning

confidence: 94%

Section: A Van Der Waals Forcementioning

confidence: 99%

Section: B Comparison With Experimentsmentioning

confidence: 99%

Section: B Comparison With Experimentsmentioning

confidence: 99%

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Mechanisms of removal of micron-sized particles by high-frequency ultrasonic waves

Brereton

1995

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…So far several qualitative and quantitative techniques such as electrostatic extraction (Hirato et al 1991), Karl Fischer titration test (Steven 1991), distillation (Timothy 1994) and electric dehydration method (Brereton and Bruno 1994) have been reported to determine water content in oils. Among them, the standard distillation method [Dean and Stark distillation method (Dean and Stark 1920)] is regarded to be one of the most mature detecting methods, but is a fairly burdensome method and needs a substantial sample volume to guarantee the accuracy.…”

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confidence: 99%

Distilling determination of water content in hydraulic oil with a ZnO/glass surface acoustic wave device

et al. 2016

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of perturbation of other impurity substances including dirt, soot, alkanes and synthetic compounds. So far several qualitative and quantitative techniques such as electrostatic extraction (Hirato et al. 1991), Karl Fischer titration test (Steven 1991), distillation (Timothy 1994) and electric dehydration method (Brereton and Bruno 1994) have been reported to determine water content in oils. Among them, the standard distillation method [Dean and Stark distillation method (Dean and Stark 1920)] is regarded to be one of the most mature detecting methods, but is a fairly burdensome method and needs a substantial sample volume to guarantee the accuracy. The achievable detection limits of water contents in oils are between 0.05 and 25 wt% (Toms and Toms 2008).Surface acoustic wave (SAW) devices are one of the key components for electronics, microsensors, and microsystems. SAW devices have been widely studied to use as a sensor to detect gas, humidity and moisture owing to their high sensitivity, small size, and ability to be interfaced with passive wireless systems, etc (Zhou et al. 2013;Zhou 2013). For instance, Khan et al. studied SAW device based fluorine gas sensor integrated on ZnO nano thin film with palladium (Pd) on top as sensing layer (Khan et al. 2015). Murakawa et al. integrated ionic liquid on a SAW resonator to detect hydrogen sulfide gas (Murakawa et al. 2013). A SAW humidity sensor based on electrospun nanofibers sensitive layer was reported to have a sensitivity of 75 kHz/%RH from 20 to 90 % RH (Lin et al. 2012). SAW devices based on Rayleigh mode were also used for measuring a small variation of moisture in gas medium with high accuracy (Kumar 2005; Xiaohui and Yang 2010).Here, we firstly propose a novel way to measure water content in hydraulic oil by using SAW device as humidity sensor combined with the standard distillation method. It is shown that SAW devices can be used to detect water Abstract Detection of water content in hydraulic oil is critical to identify abnormal wear conditions for purpose of predicting possible machinery failure in hydraulic systems. The paper reports a feasibility study of measuring the water content in the hydraulic oil using a ZnO thin film surface acoustic wave (SAW) device combined with the standard distillation method. The shift of resonant frequency of the SAW device increases with the increase of water content in hydraulic oil, and reaches 919 kHz for 0.80 wt% water content in oil samples. The results indicate that the ZnO SAW sensor can detect water content in hydraulic oil with high sensitivity.

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Interparticle Forces and External Fields

2016

Coupled CFD‐DEM Modeling

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Particle Removal By Focused Ultrasound

Cited by 18 publications

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Mechanisms of removal of micron-sized particles by high-frequency ultrasonic waves

Mechanisms of removal of micron-sized particles by high-frequency ultrasonic waves

Distilling determination of water content in hydraulic oil with a ZnO/glass surface acoustic wave device

Interparticle Forces and External Fields

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