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#include "udf.h"
DEFINE_SOURCE(source_char_com,c,t,dS,eqn)
{
Thread **pt = THREAD_SUB_THREADS(t);
Thread *tp = pt[0]; /* gas phase */
Thread *ts = pt[1]; /* solid phase */
real diam,Ts,phi,p,Vp,Re,Sc,Sh,kr,km,Dg,epsilon,kc,r;
diam=C_PHASE_DIAMETER(c,ts);
Ts=C_T(c,ts);
p=2500*exp(-5.19E04/(UNIVERSAL_GAS_CONSTANT*Ts));
Vp=pow(C_V(c,ts)*C_V(c,ts)+C_U(c,ts)*C_U(c,ts),0.5);
epsilon=C_VOF(c,tp);
if(diam<0.00005)
phi=(2*p+2.0)/(p+2.0);
else if(diam>0.001)
phi=1;
else phi=(2*p+2.0-p*(100000*diam-0.005)/0.095)/(p+2);
Re=C_R(c,tp)*Vp*diam/C_MU_L(c,tp);
Dg=3.13e-04*pow((C_T(c,tp)/1500),1.75)*(101325.0/C_P(c,tp));
Sc=C_MU_L(c,tp)/C_R(c,tp)/Dg;
Sh=2*epsilon+0.69*pow(Sc,1.0/3.0)*pow(Re/epsilon,0.5);
km=phi*Sh*Dg*12.0/diam*UNIVERSAL_GAS_CONSTANT* C_T(c,tp) ;
kr=8910*(exp(-1.4974e8/(UNIVERSAL_GAS_CONSTANT*Ts)));
kc=UNIVERSAL_GAS_CONSTANT*Ts/12.0/(1.0/km+1.0/kr);
r=6*(1-epsilon)*0.2505/diam/C_R(c,tp)*kc*1.43;
return -r;
dS[eqn]=0;
}
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