[rusthimim]

Hi there,

Please check this UDF for specific heat and conductivity and tell me this is right or wrong.. I am using a transient analysis profile for Temperature Vs Time variation on one surface. I am modeling a air cavity wall with outer and inner surface. the outer surface boundary condition is set to the Profile temperature variation.

#include "udf.h"
DEFINE_SPECIFIC_HEAT(my_user_cp, T, Tref, h, yi)
{
real cp;
if (T < 373.15)
{
cp = 950;
}
else if (T >= 373.15 && T <= 473.15)
{
cp = 17500;
}
else
{
cp = 950;
}
*h = cp*(T-Tref);
return cp;
}
#include "udf.h"
DEFINE_PROPERTY(my_user_Conductivity,c,t)
{
real k;
real T = C_T(c,t);
if (T < 413.15)
{
k = 0.25;
}
else if (T >= 413.15 && T <= 1073.15)
{
k = 0.15;
}
else if (T > 1073.15 && T <= 1273.15)
{
k = 0.4;
}
else
{
k = 0.8;
}
return k;
}