High-speed imaging of an ultrasound-driven bubble in contact with a wall

"narcissus" effect and resolved acoustic streaming

Philippe Marmottant, Michel Versluis, Nico De Jong, Sascha Hilgenfeldt, Detlef Lohse

Research output: Contribution to journalArticle

Abstract

We report microscopic observations of the primary flow oscillation of an acoustically driven bubble in contact with a wall, captured with the ultra high-speed camera Brandaris 128 (Chin et al. 2003). The driving frequency is up to 200 kHz, and the imaging frequency is up to 25 MHz. The details of the bubble motion during an ultrasound cycle are thus resolved, showing a combination of two modes of oscillations: a radius oscillation and a translation oscillation, perpendicular to the wall. This motion is interpreted using the theory of acoustic images to account for the presence of the wall. We conclude that the bubble is subjected to a periodic succession of attractive and repulsive forces, exerted by its own image. Fast-framing recordings of a tracer particle embedded in the liquid around the particle are performed. They fully resolve the acoustic streaming flow induced by the bubble oscillations. This non-linear secondary flow appears as a tiny drift of the particle position cycle after cycle, on top of the primary back and forth oscillation. The high oscillation frequency accounts for a fast average particle velocity, with characteristic timescales in the millisecond range at the lengthscale of the bubble. The features of the bubble motion being resolved, we can apply the acoustic streaming theory near a wall, which provides predictions in agreement with the observed streaming velocity.

Original languageEnglish (US)
Pages (from-to)147-153
Number of pages7
JournalExperiments in Fluids
Volume41
Issue number2
DOIs
StatePublished - Aug 1 2006
Externally publishedYes

Fingerprint

Acoustic streaming
acoustic streaming
bubbles
Ultrasonics
high speed
Imaging techniques
oscillations
Secondary flow
High speed cameras
Acoustics
Liquids
cycles
secondary flow
high speed cameras
tracers
recording
radii
acoustics
liquids
predictions

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

High-speed imaging of an ultrasound-driven bubble in contact with a wall : "narcissus" effect and resolved acoustic streaming. / Marmottant, Philippe; Versluis, Michel; De Jong, Nico; Hilgenfeldt, Sascha; Lohse, Detlef.

In: Experiments in Fluids, Vol. 41, No. 2, 01.08.2006, p. 147-153.

Research output: Contribution to journalArticle

Marmottant, Philippe ; Versluis, Michel ; De Jong, Nico ; Hilgenfeldt, Sascha ; Lohse, Detlef. / High-speed imaging of an ultrasound-driven bubble in contact with a wall : "narcissus" effect and resolved acoustic streaming. In: Experiments in Fluids. 2006 ; Vol. 41, No. 2. pp. 147-153.
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