Aerodynamic focusing in a channel with oscillating walls

P. Vainshtein*, M. Shapiro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We investigate analytically and numerically aerodynamic focusing of aerosol particles in the incompressible Poiseuille flow in a two-dimensional channel where the channel walls perform small oscillations perpendicular to the channel axis. The fluid-particle interaction is described by a linear drag force. Focusing efficiency is investigated for variety of flow and particle parameters, expressed in terms of dimensionless groups, namely parameter ε{lunate}, characterizing the amplitude of wall oscillations; flow velocity parameter ΠU = U / ω h where U is the maximal velocity of the imposed flow, h is the channel half-height, ω is the angular frequency of oscillations; and frequency parameter ω τ, where τ is Stokes relaxation time. It is shown that wall channel oscillations with frequency of about 1 kHz can focus micron-size particles on axial distances comparable to several channel heights.

Original languageEnglish
Pages (from-to)929-939
Number of pages11
JournalJournal of Aerosol Science
Issue number11
StatePublished - Nov 2008
Externally publishedYes


  • Aerodynamic focusing
  • Oscillating walls
  • Secondary streaming


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