The wall shear stress for flow in a narrow annular gap between a fixed and rotating cylinder functionally depends on density p. viscosity μ, angular velocity 52, outer radius R. and gap width Ar: Tw=f(p.H, S, R, Ar) Draw a schematic of the system. Using (p. 2. R) as repeating variables, rewrite this relation in dimensionless form and identify the "Pis" obtained.