11. A viscous-shear pump is made from a stationary housing with a close-fitting rotating drum inside. The clearance is small compared to the diameter of the drum, so flow in the annular space may be treated as flow between two parallel plates. Fluid is dragged around the annulus by viscous forces. Evaluate the performance characteristics of the shear pump (pressure differential, input power and efficiency) as a function of the volume flow rate. Assume that the depth normal to the diagram is b. R

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