CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Wiki > Dynamic viscosity

Dynamic viscosity

From CFD-Wiki

(Difference between revisions)
Jump to: navigation, search
 
(3 intermediate revisions not shown)
Line 1: Line 1:
-
The SI physical unit of dynamic viscosity (Greek symbol: <math>\mu</math>) is the pascal-second (<math>Pa\cdot s</math>), which is identical to  <math>1 \frac{kg}{m\cdot s}</math>.
+
The SI unit of dynamic viscosity (Greek symbol: <math>\mu</math>) is pascal-second (<math>Pa\cdot s</math>), which is identical to  <math>\frac{kg}{m\cdot s}</math>.
The dynamic viscosity is related to the kinematic viscosity by
The dynamic viscosity is related to the kinematic viscosity by
-
<center>
+
:<math>\mu=\rho\cdot\nu</math>
-
<math>\mu=\rho\cdot\nu</math>
+
where <math>\rho</math> is the density and <math>\nu</math> is the [[kinematic viscosity]].
-
</center>
+
 
 +
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


My wiki