Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Equal friction method
Velocity reduction method
Dual or double method
Static regains method

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

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

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