A cylinder 0.1 m diameter rotates in an annular sleeve 0.102 m internal diameter at 100 r.p.m. The cylinder is 0.2 m long. If the dynamic viscosity of the lubricant between the two cylinders is 1.0 poise, find the torque needed to drive the cylinder against viscous resistance. Assume that Newton’s Law of viscosity is applicable and the velocity profile is linear.

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To find the torque needed to drive the cylinder against viscous resistance in this scenario we can start by calculating the shear stress at the interf... View the full answer