Die Prandtlgetal (Pr) of Prandtlgroep is 'n dimensielose getal, vernoem na die Duitse fisikus Ludwig Prandtl, gedefinieer as die verhouding van momentumdiffusiwiteit tot termiese diffusiwiteit.
Die Prandtlgetal word gegee as:
Waar:
Die eenhede kanselleer dus soos volg uit:
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