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Monodispersed fine silica spheres were sedimented in KCl solution under an electrophoretic force applied in the gravitational or antigravitational direction. Effects of particle size, particle volume fraction, electrolyte concentration and applied field intensity were experimentally investigated. A Fast Fourier Transform analysis was conducted for the sediment surface and the degree of ordering of particles was evaluated. Two different conditions were found to affect the particle ordering, one related to the kinetic energy of the settling particle and the other related to the agglomeration.

Shape separation of elongated particles is conducted by a rotating horizontal sieve drum with equal circularholes of diameter 0.4 mm, through which all particles placed in the interior can flow out. The drum is 100 mm in diameter and 500 mm in length. The residence time of particles in the drum relates to the particle shape. Hence particles can be separated according to the aspect ratio. The residence time of particles is measured and related to the particle shape, the initial hold-up and the rotational frequency of drum. The particle flow through the drum is modeled to discuss the influence of the operating conditions on the residence time. It is found that the residence time increases with the aspect ratio and hold-up. The residence time distribution of the mixture of multi-shaped particles is made obtainable by a modified perfect mixing model. The particles are successfully separated according to the aspect ratio and the separation efficiency is discussed.

The separation of particles according to shape is necessary for improving the quality of powder products. The shape of a particle significantly affects

Using a rotating cylinder with blades previously reported for the batch mode operation, binary mixtures of spherical and non-spherical particles are classified continuously according to shape. Newton's separation efficiency is calculated for various operational conditions and the optimum conditions are found for the continuous shape separation. The performances of the classifier run in batch and continuous modes are compared with each other and the superiority of the continuous operation to the batch mode is shown for the rate of shape separation.