Many formulators use metrics such as Hausner ratio, Carr Index, and FFC as a measurement of powder flowability. Unfortunately, many formulations that are deemed “easy flowing” by these powder testing results find that the material will not flow reliably in powder handling equipment. By using a shear cell tester to measure cohesive strength, internal friction, compressibility, and wall friction over a range of consolidation pressures, an investigator can determine if (1) the outlet of a bin or hopper is large enough to prevent arching or the formation of a stable rathole and (2) the walls are steep enough to allow flow along them. This webinar will discuss how to use a shear cell tester and how Andrew Jenike’s analysis can be used to predict flow behavior in a bin or hopper.
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