Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Brilliant white polished body
Red hot body
Black body
Grey body

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

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

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