Index

WLF dependence

Ver: 1   DESCRIPTION For a generalized Newtonian fluid, the constitutive equation has the form

S = 2 * eta * D

  where S is the extra-stress tensor, D is the rate of deformation tensor, and eta is the viscosity.   For the FLW dependence law, the function eta is written as follows :   eta = F(g) H(T)

For the WLF  law, the function H(T) is written as follows :

H(T) = exp [ c1* (Tr-Ta) /(c2+Tr-Ta) - c1* (T-Ta) /(c2+T-Ta)],

where Ta is a reference temperature.

This menu allows the user to modify the parameters of the H function.

By default, c1 = 8.86, c2 = 101.6, Ta = 300 and Tr-Ta = 0.

  OPTIONS
 
 -1   Upper level menu
  1   Modify  c1      = 0.0000000E+00
  2   Modify  c2      = 0.0000000E+00
  3   Modify  Ta      = 0.0000000E+00
  4   Modify  (Tr-Ta) = 0.0000000E+00
NOTES The units for c1, c2, Ta and (Tr-Ta) are :
 
 parameter 
mass
length
time
temperature
c1
-
-
-
-
c2
-
-
-
1
Ta
-
-
-
1
(Tr-Ta)
-
-
-
1
SEE ALSO