Abstract
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 language | English |
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Pages (from-to) | 929-939 |
Number of pages | 11 |
Journal | Journal of Aerosol Science |
Volume | 39 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2008 |
Externally published | Yes |
Keywords
- Aerodynamic focusing
- Oscillating walls
- Secondary streaming