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Reynolds number for air

The Reynolds number is a dimensionless number.

Symbol
$\mathrm{Re}_{air}$
Formulae
$\frac{V_{air} D_o}{\nu_{air}}$for cable
$\frac{V_{air} Di_t}{\nu_{air}}$for tunnel
$\frac{V_{air} D_o}{\nu_{air}}$in free air
$\frac{V_{air} D_{do}}{\nu_{gas}}$for riser
Related
$D_{do}$
Outer diameter of duct [m]
$D_o$
Outer diameter [m]
$Di_t$
Tunnel inner diameter [m]
$\nu_{air}$
Kinematic viscosity for air [m$^2$/s]
$\nu_{gas}$
Kinematic viscosity for gas [m$^2$/s]
$V_{air}$
Air velocity [m/s]
Used in
$\mathrm{Nu}_{ext}$
Nusselt number, duct to air
$T_{at}$
Thermal resistance by convection, air to tunnel [K.m/W]
$T_{sa}$
Thermal resistance by convection, surface to air [K.m/W]