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For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} < 0.1\)) it implies

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Biot Number physical interpretation: - \(Bi < 0.1\): Conductive resistance is negligible. Temperature inside the cross-section is uniform. This justifies using the Lumped Parameter Capacity analysis for transient problems. - \(Bi > 0.1\): Internal temperature gradients are significant and cannot be ignored; spatial variations must be accounted for using Fourier equations.

Updated On: Jul 9, 2026

Higher convective resistance
High temperature gradient in the fin
Fin is infinitely long
Negligible internal conductive resistance

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The Correct Option is D

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