Prandtl Number

A dimensionless group often used in heat exchange calculations, relating the ratio of a fluid′s capacity to diffuse momentum to its capacity to diffuse heat.

P = Prandtl Number
Cp = specific heat capacity [Jkg-1K-1]
η = dynamic viscosity [kgm-1s-1]
λ = thermal conductivity [Wm-1K-1]

The Prandtl number may also be defined as the product of the Reynolds and Peclet numbers.

See also: Grashof Number, Heat, Peclet Number, Reynolds Number.

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Subjects: Mechanical Engineering Physics