Nusselt number
|
|
The Nusselt number is a dimensionless number which measures the enhancement of heat transfer from a surface which occurs in a 'real' situation, compared to the heat transfer that would be measured if only conduction could occur. Typically it is used to measure the enhancement of heat transfer when convection takes place.
- <math>\mathit{Nu}_L = \frac{hL}{k_f}<math>
where
- L = characteristic length
- kf = thermal conductivity of the fluid
- h = convection heat transfer coefficient
The Nusselt number can also be viewed as being a dimensionless temperature gradient at the surface.de:Nusselt-Zahl fr:nombre de Nusselt it:numero di Nusselt nl:Getal van Nusselt