Prandtl number - depending on the fluid properties


The Prandtl number (Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. It can alternatively be expressed as shown here.

Related formulas


PrPrandtl number (dimensionless)
cpspecific heat, (SI units: J/kgK) (J/kg*K)
μdynamic viscosity, (SI units: Pa s = N s/m^2) (Pa*s)
λthermal conductivity, (SI units: W/mK) (W/m*K)