Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number, Prandtl number and Reynold number
Prandtl number and Reynold number
Grashoff number and Reynold number
Grashoff number and Prandtl number

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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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