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The Sieving Rate of Cylinder Particles [Translated]†
The effects of particle shape and operating conditions on the sieving process were experimentally studied and the passing characteristics were discussed. Cylinder particles of unity in aspect ratio were batchwise sieved by a reciprocal shifter. The retention on a woven wire sieve of square mesh was measured and the sieving rates were obtained. The behaviour of retention with sieving time were classified into two types according as the cylinder diameter D was near the mesh size a or D « a. In the latter case, the cylinder was easily screenable and the retention exponentially decreased with sieving time. The sieving rate coefficient was independent of the initial charge. On the other hand, in the former case, the sieving rate was initially influenced by the particle mass charged on the sieve and the sieving process deviated from the exponential decrease. The sieving rate was quantitatively associated with the geometrical shape of cylinders. The sieving rate coefficients of easily screenable cylinders or in the earlier period of sieving were inversely proportional to the third power of the cylinder length. The probabilities of the cylinder passing through an opening were calculated by use of geometrical probabilities and compared with the experimental results. The number of trials of passing per unit time was almost inversely proportional to the cylinder length. Furthermore, the sieving characteristics of a set of sieves were analyzed on the basis of the rate coefficient obtained previously. It was possible to predict the change of each retention with sieving time, sufficiently. The correlation between the equivalent spherical diameter of cylinder and 50%-separation diameter measured by the multistage sieving gave that the separation diameter mainly depended on the cylinder diameter. In the vicinity of centrifugal effect of 1.3, the sieving rate was maximum and the empirical relationship presented by previous workers for the optimum shifting conditions was applicable to the cylinder particles.† This report was originally printed in J. Soc. Powder Technology, Japan, 20(1), 8-14 (1983) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
The Sieving Rate of Cylinder Particles [Translated]†
The effects of particle shape and operating conditions on the sieving process were experimentally studied and the passing characteristics were discussed. Cylinder particles of unity in aspect ratio were batchwise sieved by a reciprocal shifter. The retention on a woven wire sieve of square mesh was measured and the sieving rates were obtained. The behaviour of retention with sieving time were classified into two types according as the cylinder diameter D was near the mesh size a or D « a. In the latter case, the cylinder was easily screenable and the retention exponentially decreased with sieving time. The sieving rate coefficient was independent of the initial charge. On the other hand, in the former case, the sieving rate was initially influenced by the particle mass charged on the sieve and the sieving process deviated from the exponential decrease. The sieving rate was quantitatively associated with the geometrical shape of cylinders. The sieving rate coefficients of easily screenable cylinders or in the earlier period of sieving were inversely proportional to the third power of the cylinder length. The probabilities of the cylinder passing through an opening were calculated by use of geometrical probabilities and compared with the experimental results. The number of trials of passing per unit time was almost inversely proportional to the cylinder length. Furthermore, the sieving characteristics of a set of sieves were analyzed on the basis of the rate coefficient obtained previously. It was possible to predict the change of each retention with sieving time, sufficiently. The correlation between the equivalent spherical diameter of cylinder and 50%-separation diameter measured by the multistage sieving gave that the separation diameter mainly depended on the cylinder diameter. In the vicinity of centrifugal effect of 1.3, the sieving rate was maximum and the empirical relationship presented by previous workers for the optimum shifting conditions was applicable to the cylinder particles.† This report was originally printed in J. Soc. Powder Technology, Japan, 20(1), 8-14 (1983) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
The Sieving Rate of Cylinder Particles [Translated]†
Shigehisa Endoh (author) / Jiro Koga (author) / Kenji Yamaguchi (author)
2014
Article (Journal)
Electronic Resource
Unknown
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