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What force is required to move the inner cylinder in the axial direction with a constant speed of 1m / s?
A cylinder with a diameter of 122 mm and a length of 200 mm is located in the pipe with a diameter of 125 mm. In the space between the two cylinders, oil with a kinematic viscosity of 30 cSt (at a temperature of 20 ° C) and a relative density of 0.9 is introduced.
What force is required to move the inner cylinder in the axial direction with a constant speed of 1m / s?
What will be the percentage decrease of this force if the oil is heated to 120 ° C (oil viscosity 2.06 mPa * s)?
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