The effect of particle size distribution on the deposition of charged particles in tubes

Document Type

Article

Publication Date

11-1-2002

Abstract

A model for the deposition of charged particles in an electrically grounded cylindrical tube in the absence of an applied electric field is investigated. The underlying particle size distribution of the influent aerosol is discretized into a finite number of fractions. Each fraction has a representative particle size that determines the charge and diffusivity of particles in that fraction. A transport equation is obtained for each fraction by considering the radial electrostatic, radial diffusional, and axial advective fluxes. The electrostatic flux depends on the strength of the electric field that arises from the space charge due to the particles treated as a continuum. At short distances into the tube, radial transport toward the wall is dominated by the electrostatic flux of larger particles. At intermediate distances, the contributions of both the diffusional and electrostatic fluxes are important. Farther down the tube, radial transport is dominated by the diffusional flux of smaller particles, with the remaining larger particles persisting in the gas stream. Assuming a single mean particle size, in lieu of a realistic treatment of the actual distribution, can result in inaccurate predictions of particle capture. © 2002 Elsevier Science Ltd. All rights reserved.

Identifier

0036838152 (Scopus)

Publication Title

Advances in Environmental Research

External Full Text Location

https://doi.org/10.1016/S1093-0191(01)00113-7

ISSN

10930191

First Page

105

Last Page

115

Issue

1

Volume

7

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