[Faya]

Hello everyone,

I am beginner in UDF programing, the objective of my project is to visualize the effect of particles deposition on the heat exchange (between a cold surface and a hot fluid), I am trying to do this by calculating thermal resistance of layer of particles.
In this regard, I tried to write an UDF that calculate the heat transfer considering thhe presence of particles.
The problem is that I got errors when I hook my heat transfer UDF in the wall boundary conditions.
May you please guys help me. Any comments or suggestions are welcome.

Here is my UDF, considering the following details :
Global variables :
- R_BASE : Thermal Resistance of the wall (m^2K/W) ;
- K_Particulate : Thermal Conductivity of particles (W/m-K) ;
- T_Cool : Temperature of the fluid (K)
- T_wall : Boundary Temperature of the wall (K)
And F_UDMI(f,thread,2) : refered to thickness of particles, already calculated.

DEFINE_PROFILE(heat_flux_BC,thread,i)
{
real R_EFF;
face_t f;
begin_f_loop(f,thread)
{
//Calculate Effective thermal resistance of layers
R_EFF=R_BASE+F_UDMI(f,thread,2)/K_Particulate;
F_UDMI(f,thread,1)=R_EFF;
F_PROFILE(f,thread,i)=(T_Cool-T_wall)/R_EFF;
printf("R_eff = %f\n", R_EFF);
}
end_f_loop(f,thread)
}