Prandtl number for liquids

The Prandtl number is a dimensionless number, defined as the ratio of kinematic viscosity (also called momentum diffusivity) to thermal diffusivity.

Symbol
$\mathrm{Pr}_{w}$
Formulae
$\frac{c_{p_{w}} \eta_{w}}{k_{w}}$
Used in
$\mathrm{Nu}_{w}$