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The basic concepts of solids flow are discussed. Flow patterns (mass flow and funnel flow), and obstructions to flow (arching and ratholing) are described. Wall friction, cohesive strength, and permeability test results are used to design vessels for reliable flow.Chemical Engineering Progress, June, 2001. Copyrights © 1992 and 1998 (respectively) American Institute of Chemical Engineers. All rights reserved. Not to be uploaded to any other site without written permission from the AIChE. Individual downloads are permitted so long as a fee of $15 per article is paid directly to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923.