Two-dimensional streaming flows driven by sessile semicylindrical microbubbles

Bhargav Rallabandi, Cheng Wang, Sascha Hilgenfeldt

Research output: Contribution to journalArticle

Abstract

Steady streaming flow from oscillating sessile bubbles at walls is the centrepiece of many microstreaming experiments. A complete asymptotic theory of the flow is developed, requiring only the oscillatory driving frequency and material parameters as input, and properly accounting for bubble and wall boundary conditions. It is shown that mixed-mode streaming of neighbouring bubble oscillation modes is responsible for the robustness of the generic 'fountain' vortex pair flow pattern, and that the pattern reverses for high frequencies when wall-induced streaming becomes dominant. The far-field flow and its dependence on control parameters are in agreement with experimental data and can be understood considering just a few asymptotic coefficients.

Original languageEnglish (US)
Pages (from-to)57-71
Number of pages15
JournalJournal of Fluid Mechanics
Volume739
DOIs
StatePublished - Jan 1 2013

Keywords

  • acoustics
  • bubble dynamics
  • microfluidics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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