[rajgopal.sai]

I am using RPI model to simulate flow boiling, for nucleation site density Lemmert chawla model can be used in Fluent,
The formulation goes as follows:
N=(C (T_w -T_sat)) ^1.805

I wrote the same in an UDF, it did not give me the same results, I am not sure whether I was not able to call the wall temperature or any other issue.
The UDF goes as follows:

DEFINE_BOILING_PROPERTY(site_density,f,t,c0,t0,fro m_index,from_species_index,to_index,to_species_ind ex)
{
int wall_phase = from_index;
real wallsubcool,pro_con,site_density;
Thread **pt = THREAD_SUB_THREADS(t);
real T_SAT = C_STORAGE_R(c0,t0,SV_SAT_TEMPERATURE);
real T_W = F_T(f, pt[wall_phase]);
/* I also tried calling wall temperature by just using F_T(f,t)*/
wallsubcool = (T_W - T_SAT);
pro_con = wallsubcool * 210.0;
site_density= pow(pro_con, 1.805);
}
return site_density;

}

Suggestions please

[Joy123]

Hi, I am also trying to write the same udf for nucleation site density. I am wondering there may be some problems in wall temperature. Have you ever solved this problem?