Index

Shear-rate dependence of viscosity

Ver: 2
 

DESCRIPTION

For a Generalized Newtonian fluid, the constitutive equation has the form
S = 2 * eta * D
where S is the extra-stress tensor, eta is the viscosity, and D is the rate of deformation tensor.

The viscosity may depend upon both the second invariant of D and the temperature T.

The general form for the viscosity eta is written as

eta(g,T) = F(g) * H(T)

where functions F(g) and H(T) denote the shear-rate and the temperature dependence of the viscosity, respectively.

Several viscosity laws are available. Material parameters are entered in each specialized menu.
Default :  eta = 1. The current setup is indicated by the sign '>'.

  OPTIONS
 
-1 
 Upper level menu
1 
 Constant viscosity
Shear-rate independent viscosity
2 
 Bird-Carreau law
3 
 Power law
4 
 Bingham law
5 
 Hershell-Bulkley law
6 
 Cross law
7 
 Log-log law
8 
 modified Bingham law
9 
 modified Herschel-Bulkley law
10 
 Carreau-Yasuda law
11 
 modified Cross law
SEE ALSO