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In a footstep bearing if the speed of the shaft is...

This question belongs to Mechanical Engineering Hydraulics And Fluid Mechanics In ME
Hydraulics and Fluid Mechanics in ME
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In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Answer & Solution
Correct Answer: Option A
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2 Comments
Abhijeet Ghogare
Abhijeet Ghogare 6 years ago
Consider an annular strip of radius r and width dr.
F = Aμ (du/dy) = A μ(u/y)
u = 2πrN/60, y = h, A = 2πr dr y=h=clearance

Torque = Force * radius.
dT = 2πr dr μ(2πrN/60h)r.
dT proportional to N.
Abhijeet Ghogare
Abhijeet Ghogare 6 years ago
Consider an annular strip of radius r and width dr.
F = Aμ (du/dy) = A μ(u/y)
u = 2πrN/60, y = h, A = 2πr dr y=h=clearance

Torque = Force * radius.
dT = 2πr dr μ(2πrN/60h)r.
dT proportional to N.
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