Journal of Fluid Mechanics



Simple shear flow round a rigid sphere: inertial effects and suspension rheology


Chen-Jung  Lin a1p1, James H.  Peery a1p2 and W. R.  Schowalter a1
a1 Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540

Article author query
lin cj   [Google Scholar] 
peery jh   [Google Scholar] 
schowalter wr   [Google Scholar] 
 

Abstract

An analysis is presented of the flow field near a neutrally-buoyant rigid spherical particle immersed in an in compressible Newtonian fluid which, at large distances from the particle, is undergoing simple shear flow. Subject to conditions of continuity of stress at the particle surface and to conditions of zero net torque and zero net force on the sphere, the effect of fluid inertia on the velocity and pressure fields in the vicinity of the particle has been computed to $O(R^{\frac{3}{2}})$, where R = a2G/ν is a shear Reynolds number, a being the sphere radius, G the velocity gradient in the free stream (taken to be a positive number), and ν the kinematic viscosity.

Some streamlines have been computed and plotted. These illustrate how the fore–aft symmetry of the creeping-motion solution is destroyed when one includes inertial effects.

Knowledge of the velocity and pressure fields enables one to compute the effect of inertial forces in suspension rheology. The results include a correction to the Einstein viscosity law to $O(R^{\frac{3}{2}})$ for a dilute (non-interacting) suspension of spheres. In addition it is found that inertial effects give rise to a non-isotropic normal stress.

(Published Online March 29 2006)
(Received August 4 1969)
(Revised May 26 1970)


Correspondence:
p1 Present address: Esso Production Research Company, Houston, Texas.
p2 Present address: Humble Oil & Refining Company, Houston, Texas.


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