Abstract
A critical comparison has been carried out between values for the minimum outlet slot width and the minimum hopper wall slope for mass flow predicted by the Jenike method, and values obtained from experiments on a full-scale silo with symmetrical wedge-shaped hopper. The data for the minimum slot width were obtained for a fine SiC powder whilst a coarser, free-flowing powder of the same material was used to determine the critical slope of the hopper walls. It was found that the Jenike method overdesigned the critical hopper slope by 8 - 10°. It was further found that the slot width was overdesigned by from 0 to over 100% depending on the way in which the failure loci were extrapolated into the range of small normal stresses.
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