Gravity discharge rate of fine particles from hoppers

An experimental and theoretical study has been made of the rate with which fine particles undergo gravity discharge in air from a hopper. The particles studied were small enough for their motion to be significantly retarded by air resistance but large enough to be substantially free from cohesion (5...

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Bibliographic Details
Published in:Powder technology 1978-01, Vol.21 (2), p.245-261
Main Authors: Spink, C.D., Nedderman, R.M.
Format: Article
Language:English
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Summary:An experimental and theoretical study has been made of the rate with which fine particles undergo gravity discharge in air from a hopper. The particles studied were small enough for their motion to be significantly retarded by air resistance but large enough to be substantially free from cohesion (50 μm ⩽ d ⩽ 500 μm). A simple flow system was chosen so that particle and air properties varied in one dimension only and could be measured easily. The theoretical analysis yields inter-related equations for particle flow rate and for the spatial distributions of particle stress, bed voidage and interstitial air pressure. Particle flow rates predicted from basic material properties and hopper geometry are about twice as large as measured values but show the correct dependency on particle size.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(78)80093-X