粉体の充填に関する研究(第4報) : 二次元モデルによる粉体充填のシミュレーション

抄録

Compaction of a powder has been simulated on two-dimensional model by employing a digital computer. In the process of formation of the initial bed, 400 discs of equal size were dropped one by one into a container, introducing the probability P to make each two discs cohere in contact. Compaction of the beds by tapping was also simulated by shifting each disc into the hole present in the lower layer. In this process the coordination number of a disc and the cohesion probability P'were taken into consideration. Another probability P"was introduced in the step of insertion of a disc into the hole created by the transfer of the former disc. The relation between porosity and tapping number was fitted in Kawakita's equation when P'was relatively large and P"small. On the other hand, Kuno's equation was applicable when P'was small and P"large. It was also indicated that the cohesion probability P'is closely related to the rate constant in these equations.