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Grashof number, conductor to gas

Symbol
$\mathrm{Gr}_c$
Formulae
$\frac{g \beta_{gas} {D_c}^3}{{\nu_{gas}}^2} \left(\theta_c-\theta_{film}\right)$
Related
$\beta_{gas}$
Volumetric thermal expansion coefficient for gas [1/K]
$D_c$
External diameter of conductor [m]
$g$
Standard acceleration of gravity [m/s$^2$]
$\nu_{gas}$
Kinematic viscosity for gas [m$^2$/s]
$\theta_c$
Temperature of conductor [°C]
$\theta_{film}$
Film temperature [°C]
Used in
$\mathrm{Nu}_c$
Nusselt number, conductor to gas
$\mathrm{Ra}_c$
Rayleigh number, conductor to gas