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Type: Artigo
Title: Dynamic behaviour of a two-microbubble system under ultrasonic wave excitation
Author(s)/Inventor(s): Huang, Xiao
Wang, Qian-Xi
Zhang, A-Man
Su, Jian
Abstract: Indisponível.
Abstract: Acoustic bubbles have wide and important applications in ultrasonic cleaning, sonochemistry and medical ultrasonics. A two-microbubble system (TMS) under ultrasonic wave excitation is explored in the present study, by using the boundary element method (BEM) based on the potential flow theory. A parametric study of the behaviour of a TMS has been carried out in terms of the amplitude and direction of ultrasound as well as the sizes and separation distance of the two bubbles. Three regimes of the dynamic behaviour of the TMS have been identified in terms of the pressure amplitude of the ultrasonic wave. When subject to a strong wave with the pressure amplitude of 1 atm or larger, the two microbubbles become non-spherical during the first cycle of oscillation, with two counter liquid jets formed. When subject to a weak wave with the pressure amplitude of less than 0.5 atm, two microbubbles may be attracted, repelled, or translate along the wave direction with periodic stable separation distance, depending on their size ratio. However, for the TMS under moderate waves, bubbles undergo both non-spherical oscillation and translation as well as liquid jet rebounding.
Keywords: Microbubble dynamics
Ultrasonic wave
Boundary element method
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Elsevier
In: Ultrasonics Sonochemistry
Volume: 43
Issue Date: 10-Jan-2018
DOI: 10.1016/j.ultsonch.2018.01.012
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 1350-4177
Appears in Collections:Engenharias

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