Heat Transfer
When warm and cold liquids are mixed, the heat transfer is mainly by

convection
conduction
radiation
none of the listed here

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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

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

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