Grashof number surface-air

Symbol
$\mathrm{Gr}_{prot}$
Formulae
$\frac{D_{o}^{3} \beta_{air} g \left(- \theta_{a} + \theta_{e}\right)}{\nu_{air}^{2}}$
$D_{o}$
$\nu_{air}$
$\theta_{a}$
Ambient temperature [$^{\circ}$C]
$\theta_{e}$
Used in
$\mathrm{Ra}_{prot}$