# Dynamic viscosity

(Difference between revisions)
 Revision as of 10:56, 4 October 2006 (view source)← Older edit Latest revision as of 10:03, 12 June 2007 (view source)Jola (Talk | contribs) (3 intermediate revisions not shown) Line 1: Line 1: - The SI physical 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 SI unit of dynamic viscosity (Greek symbol: $\mu$) is pascal-second ($Pa\cdot s$), which is identical to  $\frac{kg}{m\cdot s}$. The dynamic viscosity is related to the kinematic viscosity by The dynamic viscosity is related to the kinematic viscosity by -
+ :$\mu=\rho\cdot\nu$ - $\mu=\rho\cdot\nu$ + where $\rho is the density and [itex]\nu$ 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 viscosity law|Power law]]) + * by using Kinetic Theory + * composition-dependent + * by non-Newtonian models {{stub}} {{stub}} - [[Category:Turbulence models]]

## Latest revision as of 10:03, 12 June 2007

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

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