Power-law viscosity law
From CFD-Wiki
A power-law can be used as an approximation of the viscosity of dilute gases. For dilute gases at moderate temperatures this formula is slightly less accurate than Sutherland's law. The power-law viscosity law can be written as:
Where is the viscosity in kg/m-s, is the static temperature in K, and is a dimensional coefficient. For air at moderate temperatures and pressures , and .
The power-law viscosity law can also be written as:
Where is the viscosity in kg/m-s, is the static temperature in K, is a reference value in K, is a reference value in kg/m-s. For air at moderate temperatures and pressures, , , and .
Note that there exists a different power-law for non-Newtonian fluids!