A cylinder of radius 0.2 m and length 1.3 m rotates concentrically inside a fixed cylindrical sleeve of radius 0.21 m. Find the viscosity of oil that fills the space between them if a torque of 1.2 N-m is required to maintain a rotation of 80 rpm.
The lower end of a vertical shaft rests on a foot bearing. The shaft is 1.5 m diameter and is separated from the bearing by an oil film of 0.08 cm thickness and µ, = 1.5 poise. What will be the power absorbed by the shaft when it rotates at a speed of 400 rpm?
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