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eng.nusselt-number Calculator
Calculates the Nusselt number (Nu = hL/k) and convective heat transfer coefficient from fluid properties and flow conditions using Dittus-Boelter or Churchill correlations. The Nusselt number is the dimensionless heat transfer coefficient — it relates convective to conductive heat transfer.
Reference formula or conversion factor shown for context.
Length
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
Nusselt number
Sample size or count used in the calculation.
heat transfer coeff h (W/m^2K)
Thermal energy moving from hot to cold. Rate depends on temperature difference, conductivity, and geometry (Fourier's Law for conduction; Newton's Law of Cooling for convection).
correlation
The strength and direction of the linear relationship between the two variables (-1 to +1).
fluid k (water default)
The value at the specified point or condition.
Re
Reference formula or conversion factor shown for context.
Pr
Reference formula or conversion factor shown for context.