Some of these properties include bulk density, tap density, compressibility, particle size and size distribution, fluidization, flowability, cohesion, angle of internal friction, and angle of wall friction
. Unlike most other researchers, Dr.
In addition, data obtained by shear testers may provide further information about flow properties, such as the angle of internal friction and the angle of wall friction. One disadvantage is that operating direct shear cells requires skilled technicians.
The angle of wall friction ([[phi].sub.w]) reported is the angle formed with the horizontal axis by a line drawn from the origin to a point on the wall's yield locus with a normal stress of 9.0 kPa.
The effective angle of internal friction and angle of wall friction values are used to design hoppers in Jenike's mathematical methods and are related to the failure properties in the materials.
The angle of wall friction represents the adhesive strength of the powder and the silo's or hopper's wall material; the larger the value of the angle is, the more difficult is to move the powder along the wall's surface .
The only flow parameters that were not sensitive to the particle's morphology were the angles of internal friction and angle of wall friction, which did not differ significantly between the powders.