Transient high-frequency ultrasonic water atomization

Barreras, Félix; Amaveda, H.; Lozano, Antonio

doi:10.1007/s00348-002-0456-1

Cited by 139 publications

(84 citation statements)

References 14 publications

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“…Their work noted that the mechanism of atomization appeared to be unstable unless the fluid layer was thin and that the atomization process ejected drops in three different size ranges. Barreras et al (2002) found a similar phenomenon in a detailed experimental study using a piston ultrasonic atomizer, effectively capturing a number of images that indicated the length scales of each of the instabilities giving rise to the drops. Other means for generating micron-sized drops are described in the literature, and the article by Kripfgans et al (2004) is especially thorough in describing how atomization produces small drops from a fluid jet that is subsequently exposed to intense ultrasound.…”

Section: Atomizationmentioning

confidence: 63%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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This article reviews acoustic microfluidics: the use of acoustic fields, principally ultrasonics, for application in microfluidics. Although acoustics is a classical field, its promising, and indeed perplexing, capabilities in powerfully manipulating both fluids and particles within those fluids on the microscale to nanoscale has revived interest in it. The bewildering state of the literature and ample jargon from decades of research is reorganized and presented in the context of models derived from first principles. This hopefully will make the area accessible for researchers with experience in materials science, fluid mechanics, or dynamics. The abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques common in microfluidics, along with the many applications in microfluidics and nanofluidics that appear through the literature.

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Section: Atomizationmentioning

confidence: 63%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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“…However, it has recognized the complexity introduced by an observed acoustic cavitation zone in the liquid and the periodic release of droplets from the capillary wave (fountain) formed at the surface of the liquid. Also, recent observations have noted that the droplet formation and consequent droplet size distribution are not as uniform as previously considered [1]. The formation of satellite droplets, larger than the primary droplets was reportedly observed in recent experiments and uniformity droplet size distributions over a period of time, based on a physical understanding and models of the atomization process, has been discussed [2].…”

Section: Introductionmentioning

confidence: 86%

“…Numerous reports [1][2][3][4][5][6] have been published on the mechanism of droplet formation by ultrasonic atomization with this limited understanding in the past. However, it has recognized the complexity introduced by an observed acoustic cavitation zone in the liquid and the periodic release of droplets from the capillary wave (fountain) formed at the surface of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Ethanol enrichment from ethanol–water mixtures using high frequency ultrasonic atomization

Kirpalani¹,

Suzuki²

2011

Ultrasonics Sonochemistry

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The influence of high frequency ultrasound on the enrichment of ethanol from ethanol-water mixtures was investigated. Experiments performed in a continuous enrichment system showed that the generated atomized mist was at a higher ethanol concentration than the feed and the enrichment ratio was higher than the vapor liquid equilibrium curve for ethanol-water above 40 mol%. Well-controlled experiments were performed to analyze the effect of physical parameters; temperature, carrier gas flow and collection height on the enrichment. Droplet size measurements of the atomized mist and visualization of the oscillating fountain jet formed during sonication were made to understand the separation mechanism.Crown

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“…Unfortunately, this relationship does not hold at high frequencies and the discrepancy has been remarkable 17 with some researchers even proposing ͑unnecessarily, see Ref. 14͒ cavitation as the dominant mechanism 18,19 instead. Capillary waves in microfluidics contribute to a wide range of other phenomena, including particle rafting 20 and concentration, 21 that are physically curious and have engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Using laser Doppler vibrometry to measure capillary surface waves on fluid-fluid interfaces

Friend

Yeo

2010

Biomicrofluidics

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Capillary wave phenomena are challenging to study, especially for microfluidics where the wavelengths are short, the frequencies are high, and the frequency distribution is rarely confined to a narrow range, let alone a single frequency. Those that have been studying Faraday capillary waves generated by vertical oscillation have chosen to work at larger scales and at low frequencies as a solution to this problem, trading simplicity in measurement for issues with gravity, boundary conditions, and the fidelity of the subharmonic capillary wave motion. Laser Doppler vibrometry using a Mach-Zehnder interferometer is an attractive alternative: The interface's motion can be characterized at frequencies up to 40 MHz and displacements of as little as a few tens of picometers.

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Transient high-frequency ultrasonic water atomization

Cited by 139 publications

References 14 publications

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Ethanol enrichment from ethanol–water mixtures using high frequency ultrasonic atomization

Using laser Doppler vibrometry to measure capillary surface waves on fluid-fluid interfaces

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