@wikipedia
Dimensionless quantity characterizing characterising the ratio of convective to conductive heat transfer thermal convection to thermal conduction in fluids across (normal to) the boundary with solids:
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{\rm Nu} = \frac{\rm Convective \ heat \ transfer}{\rm Conductive \ heat \
transfer} = \frac{U}{\lambda / L} =\frac{U \cdot L}{\lambda } |
where
is the convective heat transfer coefficient of the flow, is the characteristic length, is the thermal conductivity of the fluid.
For stagnant fluid the Nusselt number is a constant number (OEIS sequence A282581):
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