Powder Flow: Limitations of Mathematically Derived Parameters from Shear Cell Testing

By Tim Freeman

Shear Cell testing was originally designed to determine the incipient flow of continuous, cohesive powders under applied stress in order to simulate flow from a hopper/silo. When testing powders of this type to understand hopper behaviour, Shear Cell testing is a robust and complementary technique to the other methodologies employed by the FT4.

However, as a result of the mathematical models applied, analysis techniques used to derive commonly reported parameters are subject to limitations that can make the resulting data unreliable. Mohr’s circle analysis can introduce significant variation in the evaluation of Shear Cell test results, even when the directly measured values show an acceptable level of repeatability.

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Powder Flow: Limitations of Mathematically Derived Parameters from Shear Cell Testing

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