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

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

Reynolds number (RN) 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, cp = Specific heat at constant pressure and $$\mu $$ = Coefficient of absolute viscosity

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Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, $$\rho $$ = Density of substance, S = Specific heat and k = Thermal conductivity)