Studies on Flowability of Powder and Interparticle Cohesion

概要

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The angles of repose and the discharge-behavior from small holes under a slow agitation were studied on powders with particles of comparatively wide size ranges. Moreover, the shear-tests were done on these powders and from these data the interparticle cohesion at point of contact under zero compacting pressure was determined. The reactions between this interparticle cohesion and the angle of repose or the discharge-behavior were determined. These results are summarized as follows. 1. The relation between the discharge-rate Q(ml/min) and the relative dimension of the orifice-area to the particle-area is represented by the following equation. [numerical formula] 2. The relation between a and the reciprocal of (ψ_0/dp)^<2)> is roughly linear. 3.ψ_0/dp increases monotonically with kFo/ρpdp^3 and the relation between them is independent of the particle-shape. 4. The angle of repose increases linearly with Fo/ρpdp^3 and the relation between them is dependent on the particle-shape and in the range of small Fo/ρpdp^3 the angle of repose of the spherical particle is smaller than that of the irregular one. 5. The relation between the discharge-behavior and the angle of repose could be represented by the following equation.
公益社団法人日本薬学会の論文
1973-02-25