However the temperature gradient in the lower stratosphere is of opposite sign and so the stratosphere can not be in a state of thermodynamic equilibrium — it can only be in hydrostatic equilibrium with a continual convective heat transfer from the lower stratosphere towards the tropopause and upper troposphere. (globalwarmingsolved.com)
Since the Nusselt number is a function of the Rayleigh number it is easy to chart the amount of convective heat transfer over a range of air flows. (theinconvenientskeptic.com)
«The local convective heating of a part such as a turbine blade may be documented fairly accurately in the lab, because convective heat transfer scales up straightforwardly,» says Camci. (newscientist.com)