Nusselt Number Calculator

Find convective heat transfer coefficient from Nusselt correlations.

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Formula

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Formulas

Nu = hL/k

Dittus-Boelter: Nu = 0.023 Re^0.8 Pr^0.4 (turbulent, heating). Valid for Re > 10,000.

Nusselt Number

Ratio of convective to conductive heat transfer. Nu = 1: pure conduction. Higher Nu = stronger convection. Prandtl numbers: Air 0.71, Water 7, Engine oil 100-1000. Used in heat exchanger and cooling system design.