Accession Number : AD0741779

Title :   An Experimental Investigation of Particle Motion in a Liquid Fluidized Bed.

Descriptive Note : Final rept. 1 Jan 68-1 Aug 70,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Willus,Charles A.

Report Date : JAN 1972

Pagination or Media Count : 133

Abstract : A laboratory study was made on particle motion in liquid fluidized beds. Experiments made in a bed of 4-inch inside diameter with a large length-to-diameter ratio of 24 to 1 are described. Particle motion in the bed was found to be essentially a diffusion process. Diffusion coefficients for motion in the vertical direction were measured for glass beads of .236-inch diameter at a range of average bead concentrations. Verticle diffusion was independent of radial position in the bed. The experimental findings on particle diffusion in the bed were compared to principles of diffusion of a turbulent fluid. Steady and quasi-steady patterns of particle circulation were observed in both a cylindrical bed with a length-to-diameter ratio of 5 to 1 and in beds of conical shape, and are described. (Author)

Descriptors :   (*FLUIDIZED BED PROCESSES, DIFFUSION), PARTICLES, FLUID FLOW, MOTION, DRAG, MATHEMATICAL ANALYSIS, REYNOLDS NUMBER, REFRACTIVE INDEX, VISCOSITY, PHOTOGRAPHY

Subject Categories : Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE