タッピングによる二成分球形粒子の分離限界条件
1970 年 19 巻 201 号 p. 570-573
詳細
1970 年 19 巻 201 号 p. 570-573
Segregation of particles is observed frequently in the treatment of powders. It is necessary sometimes that such segregation will be prevented.
A report is made, in the present work, of the kinetic study that was carried out of the segregation process of the binary particle system.
First the term“the segregation speed”was proposed to express a quantitative concept as to the possibility of segregation. The relation of the segregation speed and the impulsive force which suffers the packing layer, was studied. The segregation speed was experimentally determined by a pair tapping experiments as shown in Fig. 1(c) and (d). By the speed light picture, the fall-down velocity of the container could be determined, then the impulse can be calculated from eq. (7).
The segregation speed may be proportional to the difference between the impulsive force and the surface frictional force among the particles. The relation between the impulse and the segregation speed is shown in Fig. 4.
The critical value of the particle diameter ratio r/R was about 0.57 which was determined by the extrapolation of different impulse data as shown in Fig. 5.
