بهبود توزیع جریان گاز در توده پیل‌سوختی پلیمری با خروج آب مایع از منیفولد

علوم کاربردی و محاسباتی در مکانیک

مقاله 1، دوره 34، شماره 3 - شماره پیاپی 29، آبان 1401، صفحه 1-14   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2022.76562.1118

نویسندگان

احمد رضایی سنگتابی¹؛ علی کیانی فر^{* 1}؛ ابراهیم علیزاده²

¹مهندسی مکانیک، دانشگاه فردوسی مشهد، مشهد، ایران

²مهندسی مکانیک، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

در این مقاله، توزیع جریان اکسیژن در یک توده پیل‌سوختی پلیمری به صورت عددی مورد مطالعه قرار گرفت. در ابتدا توده به‌صورت تکفاز شبیه‌سازی شده و نقش کاهش تدریجی ارتفاع منیفولد (منیفولد ذوزنقه‌ای) بر بهبود توزیع جریان میان سلول‌های سوختی بررسی گردید. از انحراف معیار و ضریب غیریکنواختی برای اندازه‌گیری بدتوزیعی جریان استفاده شده است. کاهش تدریجی ارتفاع منیفولد تا 70 درصد در منیفولد ذوزنقه‌ای، موجب بهبود 9/6 و 4/8 درصدی انحراف معیار استاندارد و ضریب غیریکنواختی گردید. نتایج شبیه‌سازی دوفازی نشان داد که چگالش بخارآب موجود در اکسیژن اشباع می‌تواند باعث تجمع آب مایع در انتهای منیفولد شود. با گذشت زمان و بهم پیوستن قطرات کوچک‌تر، شعاع قطره تشکیل شده در انتهای منیفولد افزایش یافته تا زمانی که از دیوار منیفولد جدا شده و وارد سلول‌های انتهایی گردد. در منیفولد ذوزنقه‌ای، آب مایع با مقدار کمتر و فواصل زمانی کوتاه‌تر وارد سلول انتهایی می‌گردد. پیشنهاد گردید با ایجاد محفظه‌ای در انتهای منیفولد، آب مایع جمع آوری شده و از توده تخلیه گردد. ورود مقداری گاز اضافه به منیفولد و خروج آن از محفظه جمع‌آوری آب می‌تواند باعث هدایت آب مایع به درون محفظه گردد بدون اینکه تغییرات محسوسی در افت فشار ایجاد کند.

کلیدواژه‌ها

توزیع جریان؛ پیل‌سوختی پلیمری؛ جریان دوفازی؛ تخلیه آب؛ منیفولد

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