Heat and Mass Transfer
Fouling factor is used

In heat exchanger design as a safety factor
When a liquid exchanges heat with a gas
In case of Newtonian fluids
None of these

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Heat and Mass Transfer
According to Prevost theory of heat exchange

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

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