粉体の壁面効果による基本的性質の考察

概要

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We report the results of some measurements on the wall friction test for powder and discuss them in this paper. We derive theoretically an equation, which expresses pulling a pipe (vessel) from filled powders. The equation consists of three terms: 1 the wall frictional force, 2 the powder weight, and 3 the bottom powder pressure. It is shown that the frictional force approaches the powder gravity force with increasing the powder hight vs. a pipe diameter. The theoretical tendency seems to agree with the experimental one. Although the theory can be developed with some assumptions, we have investigated the influences of these assumptions. The assumptions are as follows; 1 the bulk density is constant throughout the powder mass, 2 Rankine's coefficient is constant at the wall of the pipe, and 3 the powder pressure is constant on a horizontal plane.
山脇学園短期大学の論文
1982-12-01