title: Breakup of finite thickness viscous shell microbubbles by ultrasound: a simplified zero-thickness shell model.
abstract: A simplified three-dimensional (3-D) zero-thickness shell model was developed to recover the non-spherical response of thick-shelled encapsulated microbubbles subjected to ultrasound excitation. The model was validated by comparison with previously developed models and was then used to study the mechanism of bubble break-up during non-spherical deformations resulting from the presence of a nearby rigid boundary. The effects of the shell thickness and the bubble standoff distance from the solid wall on the bubble break-up were studied parametrically for a fixed insonification frequency and amplitude. A diagram of bubble shapes versus the normalized shell thickness and wall standoff was derived, and the potential bubble shapes at break-up from reentrant jets were categorized resulting in four distinct zones.
authors.affiliation: Dynaflow, Inc., 10621-J Iron Bridge Road, Jessup, Maryland 20794, USA. ctsung@dynaflow-inc.com
authors.forename: Chao-Tsung
authors.initials: CT
authors.lastname: Hsiao
authors.forename: Georges L
authors.initials: GL
authors.lastname: Chahine
mesh_terms: D003198:Computer Simulation; D045423:Microbubbles; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D015203:Reproducibility of Results; D013010:Sonication; D013016:Sound; D013997:Time Factors; D014465:Ultrasonics / Q000379:methods*; D014783:Viscosity
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