بررسی عددی عملکرد پیل سوختی پلیمری دو کاناله با جریان گاز ناهمسو

نوع مقاله: پژوهشی

نویسندگان

1 دانشگاه صنعتی ارومیه

2 دانشگاه ارومیه

چکیده

مدل سازی به طور وسیع در تحقیقات و کاربردهای صنعتی برای انتقال جرم و گرما درون کانال با ابعاد کوچک ، به منظور به دست آوردن درک بهتری از فرآیندهای اساسی قبل از ساخت نمونه اولیه برای بهینه سازی پیل سوختی استفاده می شود . در این مطالعه عددی مدل سه بعدی،دینامیک سیالات محاسباتی تک فازی برای کانال های جریان گاز و مجموعه الکترودو غشاء پلیمری ارائه شده است. مجموعه معادلات بقا، با استفاده از روش حجم محدود دینامیک سیالات محاسباتی ، حل عددی شده است.
مدل حاضر , پدیده‌های انتقال و عملکرد پیل را محاسبه می کند . علاوه بر این، در این مطالعه تاثیر معکوس کردن جهت جریان در سمت کاتدی بر عملکرد پیل های سوختی و توزیع گونه ها مورد برسی قرار گرفته است . نتایج هاکی از آن است چگالی جریان خروجی در‌پیل سوختی غشاء پلیمری با جریان گاز ناهمسو، کاهش یافته است و همچنین معکوس کردن جهت جریان توزیع گونه‌هادرپیل را نیز تحت تاثیر قرار داده است. نظر به این که شار برگشتی آب از کاتد به آند وشار جرمی الکترو اسمزی به شدت به یکدیگر مرتبط بوده و همچنین برای تعیین هدایتیونی غشا موثر می باشند، محاسبه این دو شار بسیار مهم می باشد. دست آخر، نتایج عددی با داده های آزمایشگاهی موجود اعتبار سنجی شده است .

کلیدواژه‌ها


عنوان مقاله [English]

Numerical investigation of counter flow polymer exchange membrane fuel cell with two channel

نویسندگان [English]

  • Nima Ahmadi 1
  • A D 1
  • E M 2
  • S R 1
2 uni
چکیده [English]

Modeling and simulation for heat and mass transport in micro channel are being used extensively in researches and industrial applications to gain better understanding of the fundamental processes and to optimize fuel cell designs before building a prototype. In this study, a full numerical, three-dimensional, single phase computational fluid dynamics (CFD) model of a proton exchange membrane fuel cell (PEMFC) with both the gas distribution flow channels and the Membrane Electrode Assembly (MEA) has been developed. A single set of conservation equations are developed and numerically solved using a finite volume based CFD technique. The present simulated single straight channel PEMFC model, accounts the major transport phenomena and the performance. Additionally, the effect of inversing the flow direction at cathode side (counter flow PEMFC) has been investigated on the fuel cell performance and species distribution. The results showed that, in the with the counter flow channels, the output current density has been decreased and also the kind of species distributions has been influenced by this phenomenon. It is very important to model the back diffusion and electro-osmotic mass flux accurately since the two fluxes was closely correlated each other and greatly influenced for determination of ionic conductivity of the membrane which directly affects the performance of fuel cell. Finally, the numerical results validated by available experimental data.

کلیدواژه‌ها [English]

  • Polymer Exchange Membrane Fuel cell
  • Voltage
  • Current density
  • CFD
 
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