Grashof number, duct in air

Symbol
$\mathrm{Gr}_{da}$
Formulae
$\frac{L_{d}^{3} \beta_{gas} g \left(- \theta_{air} + \theta_{de}\right)}{\nu_{gas}^{2}}$
$\nu_{gas}$
$\theta_{air}$
Used in
$\mathrm{Nu}_{da}$
$\mathrm{Ra}_{gas}$