木質粉粒体の振動による偏析

概要

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This experiments was confined to consideration of the segregation mechanism taking place when a binary mixture of wood particles of different sizes was vibrated in a vessel under various conditions. The coefficient of segregation was defined by representing how much fine particles percolate through a known amount of coarse particles. After the rapid size-segregation of wood particles in the early stage of vibration, the rate of segregation gradually decreases due to the saturation of fine particles in the passages among the coarse particles and to the mutual interference between the fine and the coarse particles. Generally speaking, the size-segregation is enhanced markedly with higher centrifugal effect due to the increase in the intensity of vibration. However, the wood particle layers do not segregate under extremely low frequencies or amplitudes, in spite of the theory which shows the increase of centrifugal effect with increasing either frequency or amplitude. The size-segregation becomes slower as a result of the mixing behavior when the cycle of bouncing of particles becomes out of harmony with the cycle of vibration of bed under the condition of extremely high frequency and amplitude of vibration.
1975-09-15