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Using the Navier-Stokes equations in Appendix E, solve Problem 8.13.

Problem 8.13

The device in the schematic diagram below is a viscosity pump. It consists of a rotating drum inside of a stationary case. The case and the drum are concentric. Fluid enters at A, flows through the annulus between the case and the drum, and leaves at B. The pressure at B is higher than that at A, the difference being ?ρ: The length of the annulus is L. The width of the annulus h is very small compared to the diameter of the drum, so that the flow in the annulus is equivalent to the flow between two flat plates. Assume the flow to be laminar. Find the pressure rise and efficiency as a function of the flow rate per unit depth.

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