2016 Volume 24 Pages 24-29
This study has examined the evaluation of the cohesive powder flow using the test of powder discharge by the additional pressure of the air flow. As the experimental condition, three kinds of Calcium hydroxide was used and the interstitial air pressure and the initial void fraction were varied. According to the results of powder discharge, it could be obtained the following main result: (1) A state of powder flow could be classified to the dischargeable, the transient and the non dischargeable. (2) A cohesiveness of three kinds of Calcium hydroxide have revealed from the ration of estimated cohesive force to gravity force. (3) The difference in flowability of three powders could be indicated clearly from the relationship between the ration of estimated cohesive force to gravity force. As the result, the low flowability of powder was obtained when the ration of cohesive force to gravity force is large.