Minimum transport velocity for horizontal pneumatic conveying

Abstract

The minimum transport velocity, that is, the mean air velocity required to prevent the settling of particles on the bottom of a horizontal pipe, was experimentally studied for granular particles. Two pipe sizes were used, 26 mm and 49 mm diameter, and 14 groups of solid particles ranging from 0.3 mm to 2 mm diameter were used. A general correlation for minimum transport velocity was obtained including density and size of solid particles and pipe diameter. The saltation point, at which the flow pattern changed from suspension flow to sliding flow, was also correlated on the basis of a simple theoretical consideration. © 1975, The Society of Chemical Engineers, Japan. All rights reserved.