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
“…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 .…”
“…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 .…”
“…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 .…”
“…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.…”
Axial density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-ray attenuation technology. Several measures for improving measurement precision were presented based on the discussion on attenuation law. It was found that the response frequency and the ray intensity should be as high as possible to improve the measurement precision. The mass absorption coefficient depended on not the object's thickness but the location where the object was placed between the ray source and the detector. The results showed that the density in the column decreases with the increase of column height, which indicates that the measurement by gamma-ray attenuation is reasonable.
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