Abstract
In storage, flow and handling of bulk solids, accurate determination of the angles of internal and wall friction is essential both for the efficient design of equipment and for reliable predictions of flow behaviour. Current methods of measurement of the frictional behaviour of bulk solids in conventional shear cell equipment suffer serious limitations when investigating the dynamic stress and velocity fields observed in practice. Accurate modelling of frictional behaviour requires measurements of friction angles as functions of both the individual particle properties and also of changes in the state of flow, such as those observed in filling and discharging storage vessels.
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