The two parallel disks have a diameter of D, the distance between them is h, the lower disk is fixed, the upper disk rotates at a uniform angular velocity ω, and there is a liquid with a viscosity of μ between the disks. Assuming that the distance h between the two disks is small compared with the diameter D, the velocity distribution of the liquid between the two disks is linear. Try to derive the relationship between viscosity μ and torque T and angular velocity ω.