1106 KB64 KB199820252014Katrašnik, TomažTavčar, Gregorštevilka:2letnik:61str. 284-301ISSN:1318-0207COBISSID:13507099URN:URN:NBN:SI:doc-QY2L0IQ4enSlovensko kemijsko društvoActa chimica slovenicaanalytic modellingelectrochemical kineticselektrokemični procesifuel cellsgorivne celicenumerical modellingnumerično modeliranjespecies transporttransport snoviAn innovative hybrid 3d analytic-numerical model for air breathing parallel channel counter-flow PEM fuel cells|The parallel straight channel PEM fuel cell model presented in this paper extends the innovative hybrid 3D analytic-numerical (HAN) approach previously published by the authors with capabilities to address ternary diffusion systems and counter-flow configurations. The model%s core principle is modelling species transport by obtaining a 2D analytic solution for species concentration distribution in the plane perpendicular to the cannel gas-flow and coupling consecutive 2D solutions by means of a 1D numerical pipe-flow model. Electrochemical and other nonlinear phenomena are coupled to the species transport by a routine that uses derivative approximation with prediction-iteration. The latter is also the core of the counter-flow computation algorithm. A HAN model of a laboratory test fuel cell is presented and evaluated against a professional 3D CFD simulation tool showing very good agreement between results of the presented model and those of the CFD simulation. Furthermore, high accuracy results are achieved at moderate computational times, which is owed to the semi-analytic nature and to the efficient computational coupling of electrochemical kinetics and species transportModel gorivne celice PEM z ravnimi vzporednimi kanali predstavljen v tem članku razširja inovativni hibridni 3D analitično-numerični (HAN) pristop, predstavljen v predhodnih publikacijah istih avtorjev, z zmožnostma popisa tro-komponentnih plinskih zmesi in protitočnih geometrij. Jedro modela je princip modeliranja transporta snovi z 2D analitično rešitvijo za porazdelitev koncentracije snovi v ravnini pravokotni na smer toka plina v kanalu in sklaplanjem zaporednih takih 2D rešitev s pomočjo 1D numeričnega modela za tok plina po cevi. Elektrokemijska kinetika in drugi nelinearni procesi so s transportom snovi sklopljeni s pomočjo rutine odvodne aproksimacije v prediktivno-iterativni zanki. Slednje je tudi jedro protitočnega računskega algoritma. V članku je predstavljen model HAN laboratorijske testne gorivne celice in ovrednoten s primerjavo s profesionalnim 3D CFD simulacijskim orodjem. Rezultati predstavljenega modela HAN kažejo zelo dobro ujemanje z rezultati CFD simulacij. Model HAN doseže visoko natančne rezultate ob kratkih računskih časih, za kar sta zaslužna njegova delno analitična narava in učinkovita računska sklopitev elektrokemijske kinetike in transporta snoviTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaSlovensko kemijsko društvo