Prandtl Number Calculator

Ratio of momentum to thermal diffusivity

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Prandtl Number

Ratio of momentum to thermal diffusivity

$$Pr = \dfrac{\mu C_p}{k}$$

$Pr \ll 1$: liquid metals. $Pr \approx 1$: gases. $Pr \gg 1$: viscous liquids. Appears in virtually all convective HT correlations.

μ (Pa·s)

Cp (J/kg·K)

k (W/m·K)

All fields required; k nonzero.

Prandtl Number

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