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[ÇóÖú] DEFINE_MASS_TRANSFER udf±àÒëÇóÖú

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#include "udf.h"
DEFINE_MASS_TRANSFER(o_lbe_transfer,cell,thread,from_index,from_species_index,to_index,to_species_index)
{
        Thread *o, *lbe;
        o = THREAD_SUB_THREAD(thread, from_index);
        lbe = THREAD_SUB_THREAD(thread, to_index);

        real k_pq;/*mass transfer coefficient*/
        real sh_q = 20.;/*sherwood number*/
        real diff_q;/*diffusivity of o2 in lbe*/
        real diam = C_PHASE_DIAMETER(cell, o);/*bubble diameter*/
        real vof_o = C_VOF(cell, o);
        real vof_lbe = C_VOF(cell, lbe);
        real area_intf;/*interfacial area*/
        real m_gl;
        real YI_SAT;/*soluability,wt%*/
        real YI_E;/*mass fraction of o2 in lbe corresponding to partial pressure*/
        real R_I;
        real x_o;/*molar fraction of o2 in ar*/
        real ppress;/*partial pressure*/
        real R;
        int i = 0;/*species index*/
       
    /*caculating mass transfer coefficient*/
        diff_q = 0.0239*exp(-43073. / 8.314 / C_T(cell, lbe))*0.0001;
        k_pq = sh_q*diff_q / diam;
        /*udf for specifying interfacial area*/
        area_intf = 6.*vof_o*vof_lbe / diam;
        /*mass transfer rate*/
        R = C_YI(cell, lbe, i)*C_R(cell, lbe);/* mass concentration */
        R_I = 0.0;
        m_gl = 0.0;
        YI_SAT = POW(10, 2.52 - 4803 / C_T(cell, lbe));
        x_o = 5.*C_YI(cell, o, i) / (4. + C_YI(cell, o, i));/*convert mass fraction to molar fraction*/
        ppress = x_o*(C_P(cell, o)+101325);/*total pressure*molar fraction*/
        YI_E = sqrt(ppress * 100000. / exp(13.558 - 32005 / C_T(cell, lbe)));
        if (YI_E > YI_SAT)
        {
                R_I = YI_SAT*C_R(cell, lbe);
        }
        else
        {
                R_I = YI_E*C_R(cell, lbe);
        }
        m_gl = k_pq*area_intf*(R_I - rho);
        return (m_gl);
}

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