2.59 A concentric cylinder viscometer may be formed by
rotating the inner member of a pair of closely fitting cylin-
ders. For small clearances, a linear velocity profile may
be assumed in the liquid filling the annular clearance gap.
A viscometer has an inner cylinder of 75 mm diameter and
150 mm height, with a clearance gap width of 0.02 mm.
A torque of 0.021 N·m is required to turn the inner cylinder
at 100 rpm. Determine the viscosity of the liquid in the
clearance gap of the viscometer.
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