مطالعه عددی اثر میدان مغناطیسی غیریکنواخت بر انتقال حرارت فروسیال در کانال با دو پله پیشرو

علوم کاربردی و محاسباتی در مکانیک

مقاله 5، دوره 36، شماره 3 - شماره پیاپی 37، شهریور 1403، صفحه 69-92   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.85877.1228

نویسندگان

حمیدرضا بهرامی^* ؛ مهزیار قائدی

دانشکده مهندسی مکانیک، دانشگاه صنعتی قم، قم، ایران

چکیده

امروزه برای خنک‌کاری تجهیزات الکترونیکی سامانه‌های رایانه‌ای، از کانال‌های خنک‌کننده مایع استفاده می-شود. این کانال‌ها برای عبور از المان‌ها باید تغییر سطح مقطع بدهند، بنابراین دچار انقباض و یا انبساط ناگهانی می‌شوند. این تغییرات منجر به ایجاد نواحی می‌شود که از نظر انتقال حرارت نامساعد هستند. روش‌های مختلفی برای بهبود انتقال حرارت در این نواحی پیشنهاد شده است. در مطالعه حاضر، امکان استفاده از میدان مغناطیسی غیریکنواخت برای بهبود انتقال حرارت در یک میلی‌کانال دارای دو انقباض ناگهانی پرداخته شده است. در این مطالعه فرض می‌شود فروسیال با خاصیت مغناطیسی (EMG-805-یک برند تجاری) با رژیم جریان آرام، توسعه یافته و پایا در میلی‌کانال جاری می‌شود. دیواره‌های کانال آدیاباتیک و تنها به دیواره‌های پله که در مجاورت المان الکترونیکی است، شار ثابت وارد می‌شود. اثرات مکان دوقطبی بر روی دیوارهای پایین و بالا، تعداد دوقطبی‌ها، عدد رینولدز و قدرت میدان مغناطیسی بر روی میزان بهبود انتقال حرارت بررسی شده است. نتایج به‌دست‌آمده نشان می‌دهد که افزایش عدد رینولدز و قدرت میدان مغناطیسی موجب افزایش ناسلت محلی می‌شود. اعمال تک دوقطبی مغناطیسی بر دیوار پایین و دقیقا بعد از پله موجب افزایش قابل توجه عدد ناسلت محلی و افزایش 05/164% عدد ناسلت متوسط نسبت به حالت بدون میدان مغناطیسی می‌شود.

کلیدواژه‌ها

میدان‌ مغناطیسی؛ فروسیال؛ عدد ناسلت؛ انتقال حرارت؛ دوقطبی؛ پله پیشرو

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