Abstract
It is already known that the structural strength among particles and the bulk density in a bin change greatly with different filling methods. This being the case, the frictional force acting on a rod inserted in a bin, in the beginning of discharge has to change greatly for each filling method. Therefore, the author investigated the frictional force on a rod inserted into the center in a bin. As a result, it was found that, in the case of the flow using bulk solids such as glass-beads and rapeseed, the frictional force in a dense bed achieved by peripheral feeding roughly doubled in comparison with that of a coarse bed achieved by central feeding. However, the frictional force for bulk solids such as sand did not generally change with each filling method. In this paper, an equation used to calculate the frictional force acting the insert rod was formulated.
