Bubble population phenomena in acoustic cavitation

Leighton, Timothy G.

doi:10.1016/1350-4177(95)00021-w

Cited by 235 publications

(135 citation statements)

References 93 publications

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“…a foaming process) do not appear to have been explicitly modelled, but theoretical analysis has lead researchers [19] to identify two possible cavitational behaviours: When a gas is dissolved in a liquid, changes in pressure and temperature can cause the liquid to become supersaturated and so bubbles are formed. When these bubbles, of initial small radii, are irradiated, they suffer alternate expansion/contraction due to the sinusoidal nature of the soundwave field.…”

Section: Sonochemistrymentioning

confidence: 99%

Effects of ultrasound on polymeric foam porosity

Torres-Sánchez

Corney

2008

Ultrasonics Sonochemistry

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A variety of materials require functionally graded cellular microstructures whose porosity is engineered to meet specific applications (e.g. mimic bone structure for orthopaedic applications; fulfil mechanical, thermal or acoustic constraints in structural foamed components, etc). Although a huge variety of foams can be manufactured with homogenous porosity, there are no generic processes for controlling the distribution of porosity within the resulting matrix.Motivated by the desire to create a flexible process for engineering heterogeneous foams, the authors have investigated how ultrasound, applied during the formation of a polyurethane foam, affects its cellular structure. The experimental results demonstrated how the parameters of ultrasound exposure (i.e. frequency and applied power) influenced the volume and distribution of pores within the final polyurethane matrix: the data demonstrates that porosity (i.e. volume fraction) varies in direct proportion to both the acoustic pressure and frequency of the ultrasound signal.The effects of ultrasound on porosity demonstrated by this work offer the prospect of a manufacturing process that can adjust the cellular geometry of foam and hence ensure that the resulting characteristics match the functional requirements.

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Section: Sonochemistrymentioning

confidence: 99%

Effects of ultrasound on polymeric foam porosity

Torres-Sánchez

Corney

2008

Ultrasonics Sonochemistry

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“…Figure 3b shows a representation of cavitation. Noltingk and Neppiras characterized a particular type of cavitation in which small bubbles in strong acoustic fields undergo growth to many times their original size and then subsequently undergo rapid collapse [11]. The bubble serves to concentrate the acoustic energy whereby the growth phase is isothermal with the collapse being adiabatic.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonically Enhanced Voltammetric Analysis and Applications: An Overview

Banks

Compton

2003

Electroanalysis

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“…The principle of the use of ultrasound is the phenomenon of cavitation, in other words, a physical phenomenon in which the formation, growth and implosion of micro air-bubbles occurs in a liquid medium irradiated with ultrasound (LEIGHTON, 1995;STEPHANIS et al, 1997). The phenomenon of cavitation occurring on the surface of the aggregates and in their rifts and lines of weakness is responsible for the breakup and dispersion of the primary soil particles (FRISTENSKY & GRISMER, 2008).…”

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confidence: 99%

Relationship between raindrops and ultrasonic energy on the disruption of a Haplic Cambisol

et al. 2009

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The aim of this work was to compare aggregate disruption of undisturbed soil samples by ultrasonic energy to aggregate disruption caused by the energy of simulated raindrops, to provide equations that can describe this relationship, and to evaluate whether aggregate stability, expressed by sonication method, may be used to estimate the effect that raindrops have on undisturbed soil samples. Undisturbed soil samples from A, Bi and C horizons of a Cambisol were submitted to different levels of ultrasonic energy and simulated raindrops. Sieved samples (aggregates) were also submitted to different levels of ultrasonic energy so that both disturbed and undisturbed conditions of samples could be compared. The results showed that the method using ultrasonic energy on undisturbed soil samples can simulate the amount of aggregate disruption of soil due to raindrop impact. Dispersion curves of disturbed samples may not be used to estimate the effect of raindrops on undisturbed soil samples.Index terms: Aggregation, soil structure, ultrasound. RESUMOObjetivou-se neste trabalho comparar a desagregação de amostras de solo indeformadas pela energia ultra-sônica com a desagregação causada pela energia cinética de gotas de chuva simulada, estabelecer equações para descrever essa relação e avaliar se a estabilidade de agregados determinada pelas curvas de desagregação por ultra-som pode ser usada para estimar o efeito que as gotas de chuva têm sobre amostras indeformadas. Amostras indeformadas dos horizontes A, Bi e C de um Cambissolo Háplico foram submetidas a diferentes níveis de energia ultra-sônica e gotas de chuva simulada. Amostras peneiradas (agregados) também foram submetidas a diferentes níveis de energia ultra-sônica para obtenção de curvas de desagregação. Os resultados mostraram que a quantidade de solo desagregado pelo impacto das gotas de chuva pode ser simulada pela aplicação de energia ultra-sônica sobre amostras indeformadas de solo. Curvas de desagregação de amostras deformadas não podem ser usadas para estimar o efeito das gotas de chuva sobre amostras indeformadas de solo.Termos para indexação: Agregação, estrutura do solo, ultra-som.

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Bubble population phenomena in acoustic cavitation

Cited by 235 publications

References 93 publications

Effects of ultrasound on polymeric foam porosity

Effects of ultrasound on polymeric foam porosity

Ultrasonically Enhanced Voltammetric Analysis and Applications: An Overview

Relationship between raindrops and ultrasonic energy on the disruption of a Haplic Cambisol

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