Simulation of limit-deposit velocity in horizontal liquid-solid flow

Abstract

The limit-deposit velocity at which a solid deposit begins to build up in the bottom of a pipe is numerically analyzed on the basis of a two-dimensional flow model and a comparison is made with experimental results. The model explains well the fact that the limit-deposit velocity increases with an increase in the delivered concentration of solids, and after reaching a maximum at a certain concentration it decreases gradually at higher concentrations. It is shown that, at lower solid concentrations, the shear stress acting on the surface of the bed of particles is the dominant factor for transporting the solids, while at higher concentrations the drag force of fluid within the bed plays a very important role. © 1980, The Society of Chemical Engineers, Japan. All rights reserved.