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Prandtl Number
Compare momentum diffusivity against thermal diffusivity.
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Prandtlheat transferconvection
formula
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Pr = mu Cp / k = nu / alphaPr = μCₚ / k
0.712
fluid type
Air-like gases
Pr ≪ 1: thermal diffusivity dominates (liquid metals). Pr ≈ 1: air. Pr ≫ 1: viscosity dominates (oils).