Particulate fluidization and sedimentation of spheres

Abstract

Particulate fluidization and sedimentation data were taken over the Reynolds number range of 0.005 to 1,800 by means of glass spheres in both water and ethylene glycol. Porosities for each series of measurements varied from about 0.50 to 0.91 and larger. The closely sized samples of spheres used were obtained by grinding between glass plates.The data for Reynolds numbers up to about 0.5 are in excellent agreement with the laminar theory of Ruth and the porosity function from Ruth's theory gave a satisfactory correlation of all the data, both laminar and turbulent.

Magnetic‐field augmented sedimentation of micron‐sized iron particles in a hydrocarbon

“…The effect of the changes in the solids concentration on the settling velocity may be explained in terms of the changes in the effective viscosity and density of the dispersion. The reduction in the settling velocity with increasing solids concentration as observed in Figures 4 and 5 is consistent with the established correlations for this effect by Loeffler and Ruth (1959), Barnea and Mizrahi (1973), Garside andAl-Dibouni (1977), andAdams-Viola et al (1982). Magnetic treatment has the effect of increasing the effective average size of the particles in the suspension, but does not influence the overall density of the suspension.…”

Blood, lead and spheres: A hindered settling equation for sedimentologists based on metadata analysis

“…This, in turn, is converted to the bulk settling velocity of the suspension by dividing the discharge by the cross‐sectional area of the container. The settling column and fluidisation methods have been used interchangeably and shown to yield similar, method‐independent, hindered settling velocities (Barnea & Mizrahi, 1973; Happel & Epstein, 1954; Loeffler, 1953; Loeffler & Ruth, 1959; Richardson & Meikle, 1961; Richardson & Zaki, 1954a).…”

Unifying the relative hindered velocity in suspensions and emulsions of nondeformable particles

“…We use published experimental data in the creeping flow regime [see, e.g., Lewis et al , ; Loeffler and Ruth , ; Steinour , ] to test the ability of our model to predict the hindered velocity in different multiparticle systems. The comparison for dilute to intermediate particle concentration in suspensions ( λ → ∞ ) is depicted in Figure a, which shows a very good agreement between the model (using β = 0.45) and experimental data.…”