Solution: The space between two 6 in long concentric cylinders is filled with glycerin (viscosity= 8.5x10^-3 lb s/ft^2). The inner cylinder has a radius of 3 in. and the gap width between cylinders in .1 in. Determine the torque and the power required to rotate the inner cylinder at 180 rev/min. The outer cylinder is fixed. Assume the velocity distribution in the gap to be linear.

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The space between two 6 in long concentric cylinders is filled with glycerin (viscosity= 8.5x10^-3 lb s/ft^2). The inner cylinder has a radius of 3 in. and the gap width between cylinders in .1 in. Determine the torque and the power required to rotate the inner cylinder at 180 rev/min. The outer cylinder is fixed. Assume the velocity distribution in the gap to be linear.