Talk:Biot number

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[edit] Bond Number

what is bond number

• see Bond number

[edit] Biot number vs Nusselt number

Could someone explain what the difference between the Biot number and the Nusselt number is? They have very similar expressions.

I'm not an expert but obvious difference is: Biot number uses thermal conductivity of the body k_b (not fluid), whereas Nusselt number uses thermal conductivity of the fluid k_f. - Marsian / talk 15:52, 1 January 2006 (UTC)

Nusselt number correlations are useful for determining the convective heat transfer coefficient, h. In a steady-state problem this can then be used to find the heat flux from Newton's law of cooling, Q=hAdT. The Biot number, as the article states, is helpful for determining the applicability of certain transient heat transfer models.