Abstract
Powder flowability is a characteristic related to the change in the relative position of individual particles and is affected by many factors, such as adhesion, static and kinetic friction, gravitation and inertia forces, packing fraction, coordination number, particle diameter, shape, surface roughness and density;thus, it is difficult to theoretically estimate the flowability. To accurately evaluate the flowability, the powder should be tested by an appropriate method;however, the result is different depending on the viewpoint of the powder flow phenomena;for this reason, various methods for measuring powder flowability have been proposed. In this paper, the methods are categorized based on the mechanism of the measurement, and their features, measurement procedures and evaluation methods are explained.
