Dynamical simulation of fluidized beds: Hydrodynamically interacting granular particles

Abstract

A numerical simulation of a gas-fluidized bed is performed without introduction of any empirical parameters. Realistic bubbles and slugs are observed in our simulation. It is found that the convective motion of particles is important for the bubbling phase and there is no convection in the slugging phase.From the simulation results, non-Gaussian distributions are found in the particle velocities and the relation between the deviation from Gaussian and the local density of particles is suggested. It is also shown that the power spectra of particle velocities obey power laws. A brief explanation on the relationship between the simulation results and the Kolmogorov scaling argument is discussed.

Steady state properties of a driven granular medium

“…Non-Gaussian velocity distribution has been found in granular materials under shear [23] and in fluidized beds of granules [24]. We also find that only by uniformly energy input as in the present model without uniaxial force like gravity can the granular materials have the Gaussian velocity distribution [25].…”

Computer simulation of uniformly heated granular fluids

“…This can be achieved by vibration of vessels [10] or in fluidized beds [11]. The same effect can be obtained by means of external driving forces acting locally on each particle [12].…”

Non-Newtonian hydrodynamics for a dilute granular suspension under uniform shear flow

“…However, the effect of the interstitial fluid on solid particles turns out to be significant in a wide range of practical applications and physical phenomena [6], like for instance species segregation (see for instance, Refs. [7][8][9][10][11][12][13][14][15][16]) or in biophysics where active matter may be considered as a driven granular suspension [17].…”