Dynamics of gas bubbles encapsulated by a viscoelastic fluid shell under acoustic fields

Jiménez Fernández, Javier (2014). Dynamics of gas bubbles encapsulated by a viscoelastic fluid shell under acoustic fields. "Acta Acustica united with Acustica", v. 100 (n. 6); pp. 1024-1035. ISSN 1610-1928. https://doi.org/10.3813/AAA.918782.

Description

Title: Dynamics of gas bubbles encapsulated by a viscoelastic fluid shell under acoustic fields
Author/s:
  • Jiménez Fernández, Javier
Item Type: Article
Título de Revista/Publicación: Acta Acustica united with Acustica
Date: December 2014
ISSN: 1610-1928
Volume: 100
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Energética
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The dynamics of a gas-filled microbubble encapsulated by a viscoelastic fluid shell immersed in a Newtonian liquid and subject to an external pressure field is theoretically studied. The problem is formulated by considering a nonlinear Oldroyd type constitutive equation to model the rheological behavior of the fluid shell. Heat and mass transfer across the surface bubble have been neglected but radiation losses due to the compressibility of the surrounding liquid have been taken into account. Bubble collapse under sudden increase of the external pressure as well as nonlinear radial oscillations under ultrasound fields are investigated. The numerical results obtained show that the elasticity of the fluid coating intensifies oscillatory collapse and produces a strong increase of the amplitudes of radial oscillations which may become chaotic even for moderate driving pressure amplitudes. The role played by the elongational viscosity has also been analyzed and its influence on both, bubble collapse and radial oscillations, has been recognized. According to the theoretical predictions provided in the present work, a microbubble coated by a viscoelastic fluid shell is an oscillating system that, under acoustic driving, may experience volume oscillations of large amplitude, being, however, more stable than a free bubble. Thus, it could be expected that such a system may have a suitable behavior as an echogenic agent.

More information

Item ID: 35951
DC Identifier: http://oa.upm.es/35951/
OAI Identifier: oai:oa.upm.es:35951
DOI: 10.3813/AAA.918782
Official URL: http://www.ingentaconnect.com/content/dav/aaua/2014/00000100/00000006/art00005
Deposited by: Memoria Investigacion
Deposited on: 15 Mar 2016 09:56
Last Modified: 21 Feb 2017 16:56
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