Cableizer ®

Reynolds number air

The Reynolds number is a dimensionless number.

Symbol
$\mathrm{Re}_{air}$
Formulas
$\frac{V_{air} D_{o}}{\nu_{air}}$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 duct [m]
$D_{o}$
Outer diameter [m]
$Di_{t}$
Diameter (inner) tunnel [m]
$\nu_{air}$
Kinematic viscosity air [m$^2$/s]
$\nu_{gas}$
Kinematic viscosity gas [m$^2$/s]
$V_{air}$
Air velocity [m/s]
Used in
$\mathrm{Nu}_{ext}$
Nusselt number riser—air
$T_{at}$
Thermal resistance convection air—tunnel [K.m/W]
$T_{sa}$
Thermal resistance convection object—air [K.m/W]