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Unformatted text preview: 2-D MODELING OF A PROTON EXCHANGE MEMBRANE FUEL CELLA THESIS SUBMITTED TOTHE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCESOFMIDDLE EAST TECHNICAL UNIVERSITYBYERTAN A˘GARIN PARTIAL FULFILLMENT OF THE REQUIREMENTSFORTHE DEGREE OF MASTER OF SCIENCEINMECHANICAL ENGINEERINGFEBRUARY 2010Approval of the thesis:2-D MODELING OF A PROTON EXCHANGE MEMBRANE FUEL CELLsubmitted byERTAN A˘GARin partial fulfillment of the requirements for the degree ofMaster of Science in Mechanical Engineering Department, Middle East Technical Uni-versityby,Prof. Dr. Canan¨OzgenDean, Graduate School ofNatural and Applied SciencesProf. Dr. S¨uha OralHead of Department,Mechanical EngineeringAssoc. Prof. Dr. Derek K. BakerSupervisor,Mechanical Engineering Department, METUAssist. Prof. Dr. Mehmet SankırCo-supervisor,Micro and Nanotechnology Graduate Program,TOBB ETUExamining Committee Members:Assist. Prof. Dr. Tuba Okutucu¨OzyurtMechanical Engineering, METUAssist. Prof. Dr.˙Ilker TarıMechanical Engineering, METUAssist. Prof. Dr. Ahmet YozgatlıgilMechanical Engineering, METUAssoc. Prof. Dr. Derek K. BakerMechanical Engineering, METUAssist. Prof. Dr. Mehmet SankırMicro and Nanotechnology Graduate Program, TOBB ETUDate:I hereby declare that all information in this document has been obtained and presentedin accordance with academic rules and ethical conduct. I also declare that, as requiredby these rules and conduct, I have fully cited and referenced all material and results thatare not original to this work.Name, Last Name:ERTAN A˘GARSignature:iiiABSTRACT2-D MODELING OF A PROTON EXCHANGE MEMBRANE FUEL CELLA˘gar, ErtanM.S., Department of Mechanical EngineeringSupervisor: Assoc. Prof. Dr. Derek K. BakerCo-Supervisor: Assist. Prof. Dr. Mehmet SankırFebruary 2010, 88 pagesIn this thesis, a Proton Exchange Membrane Fuel Cell is modeled with COMSOL Multi-physics software. A cross-section that is perpendicular to the flow direction is modeled in a2-D, steady-state, one-phase and isothermal configuration. Anode, cathode and membraneare used as subdomains and serpentine flow channels define the flow field . The flow velocityis defined at the catalyst layers as boundary conditions with respect to the current densitythat is obtained by using an agglomerate approach at the catalyst layer with the help of fun-damental electrochemical equations. Darcy’s Law is used for modeling the porous mediaflow. To investigate the effects of species depletion along the flow channels, a different typeof cross-section that is parallel to the flow direction is modeled by adding flow channels asa subdomain to the anode and cathode. Differently, Brinkman Equations are used to defineflow in the porous electrodes and the free flow in the channels is modeled with Navier-Stokesequations. By running parallel-to-flow model, mass fractions of species at three differentlocations (the inlet, the center and the exit of the channel) are predicted for different cell po-tentials. These mass fractions are used as inputs to the perpendicular-to-flow model to obtaintentials....
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index - 2-D MODELING OF A PROTON EXCHANGE MEMBRANE FUEL...

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