The flow properties of solids are an indicator of the way a solid will move when allowed to freely flow through a system. Flow properties are measured using a series of indices known as the “Carr Indices,” invented by Ralph L. Carr in 1965. These flow properties fit into two different categories:
A solid’s flowability is the relative easiness with which the powder moves from a stationary to a moving condition. Essentially, it is a measurement of how easily the powder starts flowing when prompted to flow, either by vacuum, air current, or water current.
A solid’s floodability is its tendency to flood, or move in an unstable, liquid-like flow. The more floodable a solid is, the more likely it is to have an uncontrolled or undesired flow. This is important, as products with more floodability may flow in a way that is counterproductive to the processing of the solid.
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