# Dynamic viscosity

(Difference between revisions)
 Revision as of 11:02, 4 October 2006 (view source)← Older edit Revision as of 12:47, 17 May 2007 (view source)Jola (Talk | contribs) mNewer edit → Line 9: Line 9: For the use in CFD, dynamic viscosity can be defined by different ways: For the use in CFD, dynamic viscosity can be defined by different ways: * as a constant * as a constant - * as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by [[Sutherland's Law]] or by the [[Power Law]]) + * as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by [[Sutherland's law]] or by the [[Power law]]) * by using [[Kinetic Theory]] * by using [[Kinetic Theory]] * composition-dependent * composition-dependent

## Revision as of 12:47, 17 May 2007

The SI unit of dynamic viscosity (Greek symbol: $\mu$) is the pascal-second ($Pa\cdot s$), which is identical to $1 \frac{kg}{m\cdot s}$.

The dynamic viscosity is related to the kinematic viscosity by

$\mu=\rho\cdot\nu$

where $\rho$ is the density and $\nu$ is the kinematic viscosity.

For the use in CFD, dynamic viscosity can be defined by different ways:

• as a constant
• as a function of temperature (e.g. piecewise-linear, piecewise-polynomial, polynomial, by Sutherland's law or by the Power law)
• by using Kinetic Theory
• composition-dependent
• by non-Newtonian models