| Definition: | quantity of dimension 1 characterizing the relative importance of forced convection and thermal conduction, defined by Pe=ρ cp v lλ=v lα, where ρ is mass density, cp is specific heat capacity at constant pressure, v is speed, l is a specified length, λ is thermal conductivity, and α is thermal diffusivity NOTE The Péclet number is the product of the Reynolds number Re and the Prandtl number Pr, thus Pe = Re ⋅ Pr.
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