Journal bearing, with radial clearance to radius ratio of 0.02, lubricant of viscosity μ = 0.03 Pa-s, works at a speed of N = 2000 rpm. It supports shaft with radial pressure of 2 N/mm2. The Somerfield number is
1
7 × 10-3
2
0.02
3
0.001
4
5 × 10-3
5
1.25 × 10-3