A hydrodynamic journal bearing is subjected to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is 20 um and bearing is lubricated with an oil having viscosity 0.03 Pa.s

6. The coefficient of friction for a flow through pipe with Reynold’s number 40000 isa. Need density, velocity, diameter, and length of pipeb. Need density, velocity, diameter, dynamic viscosity and length of pipec. 0.0707d. 0.0055

5. A 12-in.-diameter circular plate is placed over a fixed bottom plate with a 0.1-in. gap between the two plates filled with glycerin as shown in Fig. P1.4. Determine the torque required to rotate the circular plate slowly at 2 rpm. Assume that the velocity distribution in the gap is linear and that the shear stress on the edge of the rotating plate is negligible. Ans. 0.0772 ft-lb CHAPTER 1 Torque Rotating plate 0.1 in gap Figure P1.4: Illustration for Example 1.5 FLUID PROPERTIES