Heat and Mass Transfer
Reynolds number is the ratio of

Energy transferred by convection to that by conduction
Inertia force to viscous force
None of these
Kinematic viscosity to thermal diffusivity

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Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
Film coefficient × Inside diameter Thermal conductivity
Equivalent thickness of film
Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

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