دانلود مقاله ISI انگلیسی شماره 55168
عنوان فارسی مقاله

بهبود عملکرد پیل های سوختی PEM توسط جریان تورفتگی کانال

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
55168 2016 11 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Enhancement of PEM fuel cell performance by flow channel indentation
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Energy Conversion and Management, Volume 110, 15 February 2016, Pages 356–366

کلمات کلیدی
CFD؛ کانال انسداد جزئی (تورفتگی)؛ پیل های سوختی؛ پیشرفت عملکرد؛ مطالعه پارامتری
پیش نمایش مقاله
پیش نمایش مقاله بهبود عملکرد پیل های سوختی PEM توسط جریان تورفتگی کانال

چکیده انگلیسی

A three-dimensional, steady, single-phase flow of oxygen, nitrogen and water vapor mixture in the cathode of proton exchange membrane (PEM) fuel cell was numerically studied here. It was shown that the performance of the cell was enhanced by partial blockage of the flow channels in a parallel flow field. Since, channel indentation could increase oxygen content within the catalyst layer. It was observed that the influence of channel indentation in high current density regions was noticeable. Various types of blocks with profile shapes: square (SQ), semicircle (SC) and trapezoid (TR) were considered. Enhancements were compared with the no-dent (ND) called as the base case. The voltage to current relation was modeled using the Tafel equation. This provided the distribution of current density at a prescribed cell voltage. The computations were performed at 333 K, 100,000 Pa, water dew point temperature 313 K, and 50% utilization within the range of 0.2–0.8 V. It was predicted that the flow turns to be two-phase in high current density regions (say cell voltages less than 0.4 V). To push the condensate out of the flow field, adequate pressure gradient were required. This prerequisite was already taken into account in this study. A parametric study considering the influences of dent heights and arrangements, exchange current density, fluid viscous resistance and rib sizes were considered providing enhancements over 25% in the net power. The present study gives a very helpful guideline for flow field manufactures.

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