Power-law viscosity law
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(New page: A power-law can be used as an approximation of the viscosity of dilute gases. For dilute gases at moderate temperatures, this form is slightly less accurate than Sutherland's law. The ...) |
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| - | A power-law can be used as an approximation of the viscosity of dilute gases. For dilute gases at moderate temperatures | + | 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: |
:<math>\mu = BT^n</math> | :<math>\mu = BT^n</math> | ||
Latest revision as of 21:22, 17 May 2007
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!
