Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Temperature of the fin end
Surrounding temperature
Constant temperature equal to that of the base
Average temperature of the fin

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

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