Aerodynamic focusing in a channel with oscillating walls

P. Vainshtein; M. Shapiro

doi:10.1016/j.jaerosci.2008.07.001

Aerodynamic focusing in a channel with oscillating walls

P. Vainshtein^*, M. Shapiro

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 Π_U = 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
Pages (from-to)	929-939
Number of pages	11
Journal	Journal of Aerosol Science
Volume	39
Issue number	11
DOIs	https://doi.org/10.1016/j.jaerosci.2008.07.001
State	Published - Nov 2008
Externally published	Yes

Keywords

Aerodynamic focusing
Oscillating walls
Secondary streaming

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10.1016/j.jaerosci.2008.07.001

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@article{68167a61d7304bb6ba4258053ff9d230,

title = "Aerodynamic focusing in a channel with oscillating walls",

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.",

keywords = "Aerodynamic focusing, Oscillating walls, Secondary streaming",

author = "P. Vainshtein and M. Shapiro",

note = "Funding Information: This research has been supported by the Technion V.P.R. Fund. ",

year = "2008",

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doi = "10.1016/j.jaerosci.2008.07.001",

language = "英语",

volume = "39",

pages = "929--939",

journal = "Journal of Aerosol Science",

issn = "0021-8502",

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number = "11",

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TY - JOUR

T1 - Aerodynamic focusing in a channel with oscillating walls

AU - Vainshtein, P.

AU - Shapiro, M.

N1 - Funding Information: This research has been supported by the Technion V.P.R. Fund.

PY - 2008/11

Y1 - 2008/11

N2 - 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.

AB - 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.

KW - Aerodynamic focusing

KW - Oscillating walls

KW - Secondary streaming

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U2 - 10.1016/j.jaerosci.2008.07.001

DO - 10.1016/j.jaerosci.2008.07.001

M3 - 文章

AN - SCOPUS:54849407743

SN - 0021-8502

VL - 39

SP - 929

EP - 939

JO - Journal of Aerosol Science

JF - Journal of Aerosol Science

IS - 11

ER -

Aerodynamic focusing in a channel with oscillating walls

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