In rotating a chin circular disc submerged in a fluid, a torque has to be applied to the disc to overcome the frictional resistance of the fluid. Using dimensional analysis, show that where Tis the...

In rotating a chin circular disc submerged in a fluid, a torque has to be applied to the disc to overcome the frictional resistance of the fluid. Using dimensional analysis, show that

where Tis the applied torque and Dis the diameter of a disc rotating at a speed N in fluid of viscosity µ, and density p.