Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Cmin/U
U/Cmin
U/A.Cmin
U.Cmin

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

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 temperature drop through the films of fluids
Thickness of film of fluid to the thermal conductivity

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