What is the Biot number as a ratio of thermal resistanceSolu

What is the Biot number as a ratio of thermal resistance?

Solution

The Biot number is used the characterize the heat transfer resistance \"inside\" a solid body. In that case k is the thermal conductivity of the solid body, and h is the heat transfer coefficient that describes the heat transferred from the \"surface of the solid body\" to the surrounding fluid. The Biot Number can be thought of as the ratio of internal diffusion resistance to external convection resistance. Note that 1/h is the external convection resistance and L/k is the internal diffusion resistance.

Bi No = Conduction resistance / Convective resistance