Motion of micrometer sized spherical particles exposed to a transient radial flow: Attraction, repulsion, and rotation

S. Roberto Gonzalez-Avila*, Xiaohu Huang, Pedro A. Quinto-Su, Tao Wu, Claus Dieter Ohl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

It is now accepted that the physical forces in ultrasonic cleaning are due to strongly pulsating bubbles driven by the sound field. Here we have a detailed look at bubble induced cleaning flow by analyzing the transport of an individual particle near an expanding and collapsing bubble. The induced particulate transport is compared with a force balance model. We find two important properties of the flow which explain why bubbles are effectively cleaning: During bubble expansion a strong shear layer loosens the particle from the surface through particle spinning and secondly an unsteady boundary layer generates an attractive force, thus collecting the contamination in the bubble's close proximity.

Original languageEnglish (US)
Article number074503
JournalPhysical Review Letters
Volume107
Issue number7
DOIs
StatePublished - Aug 12 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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