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#include <udf.h>
#define pi 4.*atan(1.)
#define diam2 3.e-4
#define Dco2 1.699.*e-9
#define H_j 1.3.*e-3
DEFINE_EXCHANGE_PROPERTY(airtowater, cell, mix_thread, s_col, f_col)
{
Thread *thread_b, *thread_l;
real abs_v,rho_l,rho_b,klj,mbj,
mu_l,M_T,m_co2,H_j,yb_j,ylj,reyp,sc,mb_j,mu_b;

thread_b = THREAD_SUB_THREAD(mix_thread, s_col);/* bubl */
thread_l = THREAD_SUB_THREAD(mix_thread, f_col);/* liquid*/

/* find phase velocities and properties*/

rho_b = C_R(cell, thread_b);
rho_l = C_R(cell, thread_l);

real mu_b = C_MU_L(cell, thread_b);

/*compute Reynold's number*/

reyp = rho_b*abs_v*diam2/mu_b;

/*compute Scmidt's number*/

sc = mu_b/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));

/*the mass fraction on the liquid side of the interface*/

ylj_e = (H_j*m_co2*rho_b)/(M_T*rho_l);


mb_j = klj*pi*pow(r_b,2)*rho_l*(ylj_e-ylj);
return mb_j;
}
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Error: C:\Users\souhail\Desktop\1221.c: line 10: parse error.
Error: C:\Users\souhail\Desktop\1221.c: line 20: mu_b: undeclared variable