PROBLEM $8$: You are to recommend a design for a spring$-$supported thrust bearing to carry $4$ million

pounds of thrust in a $90-$rpm hydroelectric generator. The inside diameter is to be $48$ in $.$ Maximum unit

loading on the pads is limited to $500l\frac{b}{i}{n}^2,$ which will set the outside diameter. Using an assumed film

thickness ratio $\frac{h_1}{h_2}=2\mathrm{.}0,$ Calculate minimum film thickness, power loss, oil$-$film flow, and

temperature rise with $6$ pads and then $12$ pads.