Engineering tools · Free to use
Nusselt Number Calculator
Calculate Nusselt number from convection coefficient, characteristic length and fluid conductivity.
Input parameters
Inputs and calculations stay in this browser.
Result
Dimensionless result calculated from a known h. Characteristic length depends on geometry.
Equation
Nu = h L / k
Applicability
Choose characteristic length and fluid conductivity appropriate to the geometry and definition. h may be zero; length and conductivity must be positive. This tool does not predict a heat-transfer correlation.
Notes
Dimensionless result calculated from a known h. Characteristic length depends on geometry.
Worked example
For a known convection coefficient h = 12 W/(m²·K), characteristic length L = 0.05 m appropriate to the geometry, and fluid conductivity k = 0.6 W/(m·K) at the same state, Nu = 12 × 0.05 / 0.6 = 1 (dimensionless).
Results are for engineering estimates; verify final designs against operating conditions and applicable standards.