Dynamic viscosity

(Difference between revisions)

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

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-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
-<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}}
-[[Category:Turbulence models]]