Definition: | quantity of dimension 1 characterizing a transfer of heat, defined by Nu = Klλ, where K is coefficient of heat transfer, l is a length characterizing the configuration, and λ is thermal conductivity NOTE 1 The Nusselt number is often calculated by empiric formulas as a function of other characteristic numbers (Reynolds number Re, Prandtl number Pr, Péclet number Pe, Grashof number Gr), and then used to determine the coefficient of heat transfer K. NOTE 2 The name “Biot number”, symbol Bi, is used when the Nusselt number is reserved for convective transport of heat.
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