Index

Heat capacity per unit mass

Ver: 0
 

DESCRIPTION

Modifies the heat capacity per unit mass Cp(T), used in the energy equation for non-isothermal problems. Cp(T) is given as a third order polynomial in the temperature T :
  Cp(T) = a + b * T + c * T**2 + d * T**3


where a, b, c and d are material parameters.

Default values : a = b = c = d = 0.

  OPTIONS
 
-1
 Upper level menu
The current values are accepted
1
 Modification of a
2
 Modification of b
3
 Modification of c
4
 Modification of d
NOTES For non-isothermal flow problems where the temperature influences the velocity field (by means of a bouyancy effect or a temperature dependent viscosity), heat convection can lead to strong non-linearities.
Such non-linearities may require the use of an evolution scheme for reaching convergence.

While selecting values for the coefficients of the polynomial expression, the user should verify that the sign of the heat capacity remains positive within the temperature range.

When Cp does not vanish, a non-vanishing density must also be specified(see density).

The units for Cp(T) and the four parameters a, b, c and d are :
 
Parameter
Mass
Length
Time
Temperature
Cp(T)
-
2
-2
-1
a
-
2
-2
-1
b
-
2
-2
-2
c
-
2
-2
-3
d
-
2
-2
-4

SEE ALSO