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

Answer: Option C

Reynolds number (R_N) is given by $${\text{R}}_{\text{N}}=\frac{\rho \text{V}l}{\mu }$$
Where h = Film coefficient, $$l$$ = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, $$\rho$$ = Density of fluid, c_p = Specific heat at constant pressure and $$\mu$$ = Coefficient of absolute viscosity