[kingnizarios]

#include <udf.h>
#include <threads.h>
#include <metric.h>
#include <mem.h>
#include <sg_mphase.h>

#define pi 4.*atan(1.)
#define diam2 4.e-3
#define Dco2 1.699.*e-9


DEFINE_MASS_TRANSFER(airtowater,cell,t,from_index, from_speries_index,to_index,
to_species_index)
{
Thread *thread_g;
real abs_v,rho_l,klj,mbj, mu_l,H_j,yb_j,ylj_e,ylj,reyp,sc;


/*compute Reynold's number*/
reyp = rho_l*abs_v*diam2/mu_l;
/*compute Scmidt's number*/
sc = mu_l/rho_l*Dco2;
/*compute mass transfert coefficient for chemical species j*/
klj = Dco2/diam2(2+0.015.*pow(reyp,0.89)*pow(sc,0.7));
/*compute mass transfer*/
mbj = klj*pi*pow(diam2,2)*rho_l*(ylj_e-ylj);
}

[alighaffari]

what is your expectancy from this udf? what is problem?