Heat Transfer
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Minimum resistance presents in the series
Maximum resistance in the series
Average of all resistances
Sum of all resistances

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Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

thermal boundary layer lies inside the concentration boundary layer
concentration boundary layer lies inside the thermal boundary layer
thermal & concentration boundary layers are of equal thickness
none of the listed here

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