15
b.
Calculation for use when taking into account the edge effects is derived from the
measured torque as follows:
R = 1 inch and assuming that the 477.5 psi (3292 kPa) on the average is achieved only
2/3 the distance of the cake deposition up the edge:
2.
The normal force (F
n
)
The differential or normal force (F
n
) on the plate is derived by multiplying the area by
the differential pressure:
Considering edge effects:
With edge effects R = 1 inch
Then, assuming the recommended pressure of 477.5 psi (3292 kPa)
C.
The Bulk Sticking Coefficient (K
sc
)
The bulk sticking coefficient K
sc
is the ratio of the sliding force to the normal force: