Diffusivity (transport equation)

Index Polynomial law Ver: 2

DESCRIPTION

Allows the user to modify the temperature dependence of the diffusivity Df as used in transport problems. Df is calculated as :

Df = cst * f(T)

By default, there is no temperature dependence, i.e. Df reduces to cst. Default value for cst is 1. When a temperature dependence is requested, POLYFLOW computes a polynomial form :

f(T) = 1 + a1 *T + a2 *T*T + a3 *T*T*T

where 'a1' to 'a3' are parameters. By default, a1 to a3 vanish.

OPTIONS

-1
Upper level menu

The current values are accepted

1
Modification of a1

The value of a1 is modified

2
Modification of a2

The value of a2 is modified

3
Modification of a3

The value of a3 is modified

NOTES The units for the parameters are :

Parameter	Mass	Length	Time	Temperature	Mole
Df	-	2	-1	-	-
cst	-	2	-1	-	-
a1	-	-	-	-1	-
a2	-	-	-	-2	-
a3	-	-	-	-3	-
T	-	-	-	1	-

SEE ALSO

transport equation (UM)
create a new sub-task
system of units
material data

-1	Upper level menu
	The current values are accepted
1	Modification of a1
	The value of a1 is modified
2	Modification of a2
	The value of a2 is modified
3	Modification of a3
	The value of a3 is modified