GATE ME 2014 Set 1 — Question 22
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Heat Transfer → Conduction → Biot & Fourier Numbers
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Question
Biot number signifies the ratio of
Correct answer
(B) conductive resistance in the solid to convective resistance in the fluid
Solution
The Biot number () is a dimensionless quantity used in heat transfer calculations. It is defined as the ratio of the internal conductive resistance within a solid to the external convective resistance at the surface of the solid.where is the heat transfer coefficient, is the characteristic length, and is the thermal conductivity of the solid. Thus, option (B) is correct.
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