Concentration effects on photophoresis of aerosol spheres
Resource
Colloids and Surfaces A: Physicochemical and Engineering Aspects 196 (2-3): 153-162
Journal
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Journal Issue
196
Pages
153-162
Date Issued
2002
Date
2002
Author(s)
Keh, Huan J.
Abstract
The photophoretic motion of a homogeneous suspension of identical spherical particles of arbitrary thermal conductivity and surface properties exposed to a radiative flux is considered under conditions of small Knudsen, Reynolds, and Peclet numbers. The effects of interaction of the individual particles are taken into explicit account by employing a unit cell model which is known to provide good predictions for the sedimentation of monodisperse suspensions of spherical particles. The appropriate equations of conservation of energy and momentum are solved for each cell, in which a spherical particle is envisaged to be surrounded by a concentric shell of suspending fluid, and the photophoretic velocity of the particle is calculated for various cases. Analytical expressions of this mean particle velocity are obtained in closed form as monotonically decreasing functions of the non-vanishing volume fraction of the particles. The normalized photophoretic velocity increases with an increase in the relative conductivity of the particles for a given particle concentration. © 2002 Elsevier Science B.V. All rights reserved.
SDGs
Other Subjects
Energy conservation; Reynolds number; Sedimentation; Surface properties; Thermal conductivity; Volume fraction; Aerosol spheres; Photophoresis; Aerosols; aerosol; article; energy conservation; liquid; mathematical analysis; molecular interaction; molecular model; prediction; priority journal; surface property; suspension; thermal conductivity; velocity
Type
journal article
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