Q.

Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

• ARN = hl/k
• BRN = μ cp/k
• CRN = ρ V l /μ
• DRN = V²/t.cp