Flowability Tests for Powders

Abstract

Powder flowability is affected by many factors, such as particle diameter, shape, adhesion, and friction ; thus, it is difficult to theoretically estimate the flowability. To accurately estimate the flowability, powders should be tested. In this review, the test methods are categorized based on the mechanism of measurement, and their systems and procedures are explained. In addition, experimental results obtained by a vibrating tube method that was developed to evaluate the flowability in more detail are presented.