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February 8, 2010, 23:49 |
EulerGranular multiphase
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#1 |
Member
chétan
Join Date: May 2009
Location: Australia
Posts: 55
Rep Power: 16 |
ello Every one,
I am trying to model reaction C+0.5O2->CO E= 1.36E06 J/Kmol, A = 1.3E6 with reaction order n =0.68. Above reaction, i am trying to employ in Eulerian-Granular multiphase model. The basic idea of the model is primary phase oxygen reacts with secondary phase Carbon (fluid species). To introduce this reaction i need to write UDF and hook to the solver with define>Phases>interaction panel. I have very little experience with writing UDF's. I realized that i need to use "DEFINE_HET_RXN_RATE" macro, any one have experience with mentioned macro?? i have found following UDF (from population balance model manual), but i am not sure wheather this UDF will be useful for my purpose. And if it is useful, how do i introduce "reaction order" term into udf?? |
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February 9, 2010, 00:03 |
heterogeneous reaction UDF
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#2 |
Member
chétan
Join Date: May 2009
Location: Australia
Posts: 55
Rep Power: 16 |
/* this is the UDF i found out from */
/* Population Balance Module Manual */ #include "udf.h" static const real A = 1.36E06; static const real E = 1.30E08; DEFINE_HET_RXN_RATE(reac1,c,t,hr,mw,yi,rr,rr_t) { Domain **domain_reactant = hr->domain_reactant; real *stoich_reactant = hr->stoich_reactant; int *reactant = hr->reactant; int i; int sp_id; int dindex; Thread *t_reactant; real ci; real T = 1200; *rr = 0; for (i=0;i<hr->n_reactants;i++) { sp_id = reactant[i]; if(sp_id == -1)sp_id = 0; dindex = DOMAIN_INDEX(domain_reactant[i]); t_reactant = THREAD_SUB_THREAD(t,dindex); /* get concentration */ ci = yi[dindex][sp_id]*C_R(c,t_reactant)/mw[dindex][sp_id]; ci = MAX(ci,SMALL_S); *rr += stoich_reactant[i] * log(ci); } *rr += log(A + SMALL_S) - E/(UNIVERSAL_GAS_CONSTANT * T); *rr = MAX(*rr, -40); *rr = MIN(*rr, 40); *rr = exp(*rr); } |
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eulergranular multiphase |
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