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Nusselt number, ground to air

In heat transfer at a boundary (surface) within a fluid, the dimensionless Nusselt number is the ratio of convective to conductive heat transfer across (normal to) the boundary.

A Nusselt number close to one, namely convection and conduction of similar magnitude, is characteristic of laminar flow. A larger Nusselt number corresponds to more active convection, with turbulent flow typically in the range of 100 to 1000.

Symbol
$\mathrm{Nu}_L$
Formulae
$C_{Nu,L} {\mathrm{Ra}_L}^{\frac{1}{m_{Nu,L}}}$
Related
$C_{Nu,L}$
Factor C
$m_{Nu,L}$
Factor m
$\mathrm{Ra}_L$
Rayleigh number, ground to air
Used in
$h_{tr}$
Heat transfer coefficient [W/(K.m$^2$)]