Heat and Mass Transfer
The heat transfer takes place according to

Zeroth law of thermodynamics
First law of thermodynamics
Kirchhoff's law
Second law of thermodynamics

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Heat and Mass Transfer
According to Prevost theory of heat exchange

All bodies above absolute zero emit radiation
It is impossible to transfer heat from low temperature source to t high temperature source
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
Heat transfer by radiation requires no medium

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thickness of film of fluid to the temperature drop through the films of fluids
Temperature drop through the films of fluids to the thickness of film of fluids
Thermal conductivity to the equivalent thickness of the film of fluid
Thickness of film of fluid to the thermal conductivity

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