(170b) The Unsteady Drag Force on a Cylinder Immersed in a Dilute, Decelerating Granular Flow
AIChE Spring Meeting and Global Congress on Process Safety
2006
2006 Spring Meeting & 2nd Global Congress on Process Safety
Fifth World Congress on Particle Technology
Rapid Granular Flows in Chutes, Channels and Feeders
Wednesday, April 26, 2006 - 8:20am to 8:40am
Abstract
The results from hard-particle, discrete element simulations of a two-dimensional dilute stream of particles decelerating around an immersed fixed cylinder are presented. Simulation measurements of the drag force, Fd , are expressed in terms of a dimensionless drag coefficient, 
, where r is the particle density, 
is the upstream solid fraction, U is the upstream instantaneous velocity, and D and d are the cylinder and particle diameters, respectively. The drag results and flow patterns for decelerating flows are compared with corresponding steady flows and accelerating flows.
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