Granular coefficient of restitution using coupled kinetic theory of
granular flow and discrete element method
Abstract
The granular coefficient of restitution (CoR) is an empirical data of
simulations using two-fluid model with kinetic theory of granular flow
(KTGF). The CoR relates with binary inelastic collisions of discrete
particles. In present study, an approach of coupled KTGF for Euler
granular phase and discrete element method (DEM) for discrete particles
is proposed. The granular CoR is computed from the binary collisions of
discrete particles using DEM. The momentum transfer between the Euler
gas phase and the discrete particles is calculated from the momentum
transfer coefficient between the Euler gas phase and Euler granular
phase. The viscous force of discrete particles of DEM is computed from
the turbulent model of Euler gas phase. A correlation of granular CoR is
proposed as a function of granular volume fractions. The simulated axial
velocities of Euler granular phase and discrete particles are in
agreement with experiments in a spout fluidized bed.