Determination of velocity, size and concentration of ultrasonic cavitation bubbles by the phase-Doppler technique

Tsochatzidis, Nikolaos A.; Guiraud, Pascal; Wilhelm, Anne‐Marie; Delmas, Henri

doi:10.1016/s0009-2509(00)00460-7

Cited by 171 publications

(87 citation statements)

References 20 publications

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“…Indeed, the test can be thought as if the coating surface was continuously bombarded by shock waves produced by the numerous cavitation bubbles collapsing near the sample surface. The bubble size without the sample surface can be expected to be approximately 10 μm [35].…”

Section: Cavitation Erosion Wear Resistancementioning

confidence: 99%

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

et al. 2014

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Thermally-sprayed alumina based materials, e.g., alumina-titania (Al 2 O 3 -TiO 2 ), are commonly applied as wear resistant coatings in industrial applications. Properties of the coatings depend on the spray process, powder morphology, and chemical composition of the powder. In this study, wear resistant coatings from Al 2 O 3 and Al 2 O 3 -13TiO 2 powders were sprayed with plasma and high-velocity oxygen-fuel (HVOF) spray processes. Both, fused and crushed, and agglomerated and sintered Al 2 O 3 -13TiO 2 powders were studied and compared to pure Al 2 O 3 . The coatings were tested for abrasion, erosion, and cavitation resistances in order to study the effect of the coating structure on the wear behavior. Improved coating properties were achieved when agglomerated and sintered nanostructured Al 2 O 3 -13TiO 2 powder was used in plasma spraying. Coatings with the highest wear resistance in all tests were produced by HVOF spraying from fused and crushed powders.

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Section: Cavitation Erosion Wear Resistancementioning

confidence: 99%

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

et al. 2014

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“…Since the summation of the pulses suppresses reflections from static scatterers, only reflections from dynamic scatterers such as the bubble cloud are preserved in the received signal. As the diameter of the bubbles is much smaller than the acoustic wavelength [13,14], all reflections are scattered incoherently and omnidirectionally from the focal area. While the reflected waves propagate back from the bubble cloud towards the transducer, they are subject to any form of attenuation.…”

Section: Proposed Acoustic Methods: Cavitation-enhanced Back Projectionmentioning

confidence: 99%

Cavitation-enhanced back projection for acoustic detection of attenuating structures

Ramaekers¹,

Greef²,

Moonen³

et al. 2017

AIP Conference Proceedings

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Strategy of high efficiency and refined high-intensity focused ultrasound and ultrasound monitoring imaging of thermal lesion and cavitation AIP Conference Proceedings 1821, 060002 (2017) Abstract. Current methodology for the detection of attenuating structures in abdominal HIFU interventions requires lengthy, elaborate image analysis, which is undesired in a clinical setting. In this work, a method for the acoustic detection of attenuating structures in the beam path of the therapeutic HIFU array is described. The proposed method is used to determine binary apodizations that can be applied to the HIFU transducer for intercostal shot positions. Such a binary apodization was determined in vivo on an anesthetized pig under controlled breathing. Validation of the proposed method was done by comparing the binary apodization based on the proposed method to a binary apodization obtained using methodology based on MR image analysis and a collision detection algorithm. The proposed acoustical method provided a binary apodization that was over 90% similar to the apodization obtained using the image analysis-based method. Additionally, the proposed method can provide a measure of the amount of attenuation that each respective transducer element encounters in its beam path towards the focus.

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“…is a widely used method to quantify the chemical activity and map active zones in a sonoreactor. Evidently knowing the exact bubble size distribution and their spatial localization is very difficult ((Luther et al, 2001;Tsochatzidis et al, 2001;Fernandez Rivas et al, 2012)), and most studies are based on bubble dissolution when US is turned off (Brotchie et al, 2009;Labouret & Frohly, 2002;Chen et al, 2002). By virtue of dissolved propanol in water, information about the presence of transient cavitating bubbles can be obtained Price et al, 2004).…”

Section: Methodsmentioning

confidence: 99%

Sonoluminescence and sonochemiluminescence from a microreactor

Rivas

Ashokkumar

Leong

et al. 2012

Ultrasonics Sonochemistry

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Micromachined pits on a substrate can be used to nucleate and stabilize microbubbles in a liquid exposed to an ultrasonic field. Under suitable conditions, the collapse of these bubbles can result in light emission (sonoluminescence, SL). Hydroxyl radicals (OH . ) generated during bubble collapse can react with luminol to produce light (sonochemiluminescence, SCL). SL and SCL intensities were recorded for several regimes related to the pressure amplitude (low and high acoustic power levels) at a given ultrasonic frequency (200 kHz) for pure water, and aqueous luminol and propanol solutions. Various arrangements of pits were studied, with the number of pits ranging from no pits (comparable to a classic ultrasound reactor), to three-pits. Where there was more than one pit present, in the high pressure regime the ejected microbubbles combined into linear (two-pits) or triangular (three-pits) bubble clouds (streamers). In all situations where a pit was present on the substrate, the SL was intensified and increased with the number of pits at both low and high power levels. For imaging SL emitting regions, Argon (Ar) saturated water was used under similar conditions. SL emission from aqueous propanol solution (50 mM) provided evidence of transient bubble cavitation. Solutions containing 0.1 mM luminol were also used to demonstrate the radical production by attaining the SCL emission regions.

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Determination of velocity, size and concentration of ultrasonic cavitation bubbles by the phase-Doppler technique

Cited by 171 publications

References 20 publications

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

Cavitation-enhanced back projection for acoustic detection of attenuating structures

Sonoluminescence and sonochemiluminescence from a microreactor

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