Author:
WANG Y.,MAURI R.,ACRIVOS A.
Abstract
We study the shear-induced gradient diffusion of particles in an
inhomogeneous
dilute suspension of neutrally buoyant spherical particles undergoing a
simple shearing
motion, with all inertia and Brownian motion effects assumed negligible.
An expansion
is derived for the flux of particles due to a concentration gradient along
the directions
perpendicular to the ambient flow. This expression involves the average
velocity
of the particles, which in turn is expressed as an integral over contributions
from
all possible configurations. The integral is divergent when expressed in
terms of
three-particle interactions and must be renormalized. For the monolayer
case, such
a renormalization is achieved by imposing the condition of zero total macroscopic
flux in the transverse direction whereas, for the three-dimensional case,
the additional
constraint of zero total macroscopic pressure gradient is required. Following
the
scheme of Wang, Mauri & Acrivos (1996), the renormalized integral is
evaluated
numerically for the case of a monolayer of particles, giving for the gradient
diffusion
coefficient 0.077γa2c¯2,
where is the applied shear rate, a the radius of the spheres
and c¯ their areal fraction.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
37 articles.
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