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DEFINE_SOURCE(liq_src, cell, pri_th, dS, eqn)     //ÒºÏàÖÊÁ¿Ô´ÏîUDF
  {   Thread *mix_th, *sec_th;    //¶¨Ò弯ËãÇøÏßÖ¸Õë   
       real m_dot_l;     //¶¨ÒåÒºÏàÖÊÁ¿×ªÒÆ kg/(m2.s)  
      mix_th = THREAD_SUPER_THREAD(pri_th);        //Ö¸Ïò»ìºÏÇøµÄÖ÷Ï༴ҺÏàµÄÖ¸Õë   
     sec_th = THREAD_SUB_THREAD(mix_th, 1);       //Ö¸Ïòµ¥Ïà¿ØÖÆÇøµÄÆøÏàµÄÖ¸Õë£¬ÆøÏàΪµÚ¶þÏà   
       if(C_T(cell, mix_th)>=T_SAT)           //Èç¹ûÒºÏ൥ԪµÄζȸßÓÚÕô·¢Î¶ȣ¬ÒºÏàÏòÆøÏàµÄÖÊÁ¿ÖÊÁ¿×ªÒÆ            
          {         m_dot_l = -0.1*C_VOF(cell, pri_th)*C_R(cell, pri_th)* fabs(C_T(cell, mix_th) - T_SAT)/T_SAT;    £¨1£©  
                    dS[eqn] = -0.1*C_R(cell, pri_th)*fabs(C_T(cell, mix_th) - T_SAT)/T_SAT; £¨2£©
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