Reconsider Prob. 2–127. The shaft now rotates with a constant angular speed of n =1450 rpm in a bearing with variable diameter. The clearance between shaft and bearing, which varies from h₁ = 1.2 mm to h₂ = 0.4 mm, is filled with a Newtonian lubricant whose dynamic viscosity is 0.1 Pa·s. Determine the torque required to maintain the motion.

Data from Problem 127

A shaft with a diameter of D = 80 mm and a length of L = 400 mm, shown in Fig. P2–127 is pulled with a constant velocity of U = 5 m/s through a bearing with variable diameter. The clearance between shaft and bearing, which varies from h₁ = 1.2 mm to h₂ = 0.4 mm, is filled with a Newtonian lubricant whose dynamic viscosity is 0.10 Pa·s. Determine the force required to maintain the axial movement of the shaft.

Transcribed Image Text:

h₁ Viscous oil, u X FIGURE P2-127 Shaft L Bearing h₂ U