1) The following data is given for 3600 hydrodynamic bearings.

Radial load = 10KN, Journal speed = 1450 rpm, L/D ratio = 1, Bearing length = 50mm, Radial clearance = 20 microns, Eccentricity = 15 microns

Calculate

1. The minimum oil film thickness
2. The coefficient of friction
3. Power lost in friction
4. Viscosity of lubricant in Centipoise
5. The total flow rate of the lubricant in liters per minute

2) Design a hydrodynamic bearing for a centrifugal pump to support a load of 8 KN when operating at 1600 rpm. Write assumptions if required and analyze the performance.

3) A full journal bearing ($\beta$=360°) is used for supporting a load of 7KN. Runs at 500 rpm for machine tool application. Select fit H9e9 and Take L/D=1.

Find:

1. Bearing dimensions
2. Sommerfeld Number
3. Minimum oil film thickness
4. Coefficient of friction
5. Rise in temp of the oil

4) The radial load on a180° hydro-dynamically lubricated journal bearing is 12 KN. journal speed is 960 rpm. Assuming a suitable fit, design the bearing for average clearance. Considering heat generated is dissipated from the bearing surface area, which is 25 LD. The bearing, which is placed in an oil bath, is cooled by moving air. The pressure is limited to $1.5 N/mm^2$. Find the oil flow rate, coefficient of friction, power loss, and temperature rise.