Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Both (A) and (B)
Directly proportional to the surface area
Directly proportional to the difference of temperatures between the two bodies
Either (A) or (B)

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

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

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