2006 Spring Meeting & 2nd Global Congress on Process Safety
(170c) Drag Correlations for 3-D, Dilute Granular Flow
Abstract
The results from hard-particle, discrete element simulations of two- and three- dimensional, dilute granular flows past an immersed sphere and cylinder are presented. Simulation measurements of the drag force, Fd, are expressed in terms of a drag coefficient, 
for 2-D, and 
for 3-D, where r is the particle density, 
is the upstream solid fraction, U is the upstream instantaneous velocity, and D and d are the sphere and particle diameters, respectively. The sphere's drag coefficient is a function of the flow Knudsen number,
and 
.