Particle motion in packed/ebullated beds by CT and CARPT

Abstract

( )Computed tomography CT and computer-automated radioacti®e particle tracking ( ) CARPT were used to study the gas distribution and incipient particle motion in a packedrebullated bed in which gas and liquid are in cocurrent upflow. CT

CFD of multiphase flow in packed‐bed reactors: I. k‐Fluid modeling issues

“…For example, the measured section porosity data from a cylindrical column packed with 3-mm monosize spheres exhibit a Gaussian dis-Ž . tribution at a section-size of 3 mm Chen et al, 2001 . How-ever, a nearly binomial distribution of sectional porosity distribution is found by MRI measurement at a section size of Ž .…”

CFD modeling and simulation of clogging in packed beds with nonaqueous media

“…Once the mesh size is decided, the local voidage per cell is obtained by means of a simple simulation program that assigns randomly porosity values by using a normal Gaussian probability den-Ž . sity function Jiang et al, 2001;Chen et al, 2001 . A mean bed porosity of 0.37 is used, which is the value measured by Ž .…”

Application of gamma-ray attenuation technology in density measurement of a slurry reactor

“…For gas-liquid-solid systems, the technique may be used only with the help of some physically valid assumption(s) [15] or some other appropriate holdup measurement technique [16]. Further explorations are under way to obtain more detailed phase holdup profile information by combining with other measurement techniques.…”