بررسی عملکرد ترموهیدرولیکی و کاهش مصرف انرژی یک چاه حرارتی میکروکانالی منیفولدی با نانوسیال هیبریدی حاوی نانوصفحات گرافن- پلاتین

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

چکیده

با توجه به شار حرارتی بالا در تجهیزات الکترونیکی، خنک‌سازی بهتر این تجهیزات با استفاده از چاه حرارتی میکروکانالی امروزه مورد توجه بسیاری از محققان قرار گرفته است، اما توجه به کاهش مصرف انرژی یکی از موارد ضروری است که مورد توجه محققان و سازندگان قرار گرفته است. خصوصیات ترموهیدرولیکی و صرفه‌جویی در انرژی برای نانوسیال هیبریدی حاوی نانوصفحات گرافن-پلاتین با سیال پایۀ آب در داخل یک چاه حرارتی میکروکانالی منیفولدی برای جریان آرام به‌صورت عددی برای کسرحجمی‌های مختلف نانوسیال (02/0=φ، 06/0=φ و 1/0%=φ) و اعدد رینولدز (20 Re= تا 100Re=) بررسی شده است. خواص نانوسیال هیبریدی وابسته به دما در نظر گرفته شد. با توجه به مطالعات انجام‌شده در این تحقیق، نانوسیال هیبریدی حاوی نانوصفحات گرافن-پلاتین در یک چاه حرارتی میکروکانالی منیفولدی عملکرد انتقال حرارت را بهبود می‌بخشد. فاکتور یکنواختی خنک‌کنندگی به‌عنوان معیاری برای تشخیص مناطق با حرارت بالا با افزایش عدد رینولدز و کسر حجمی نانوسیال کاهش می‌یابد. عدد ناسلت (Nu) با افزایش رینولدز و کسر حجمی نانوسیال افزایش می‌یابد. 10/38 Numax= برای 100Re= و 1/0%=φ و 17/24 Numin=برای 20 Re=و 0=φ به دست می‌آید. مقاومت حرارتی با افزایش کسر حجمی نانوسیال و عدد رینولدز کاهش می‌یابد. با افزایش عدد رینولدز و کسر حجمی نانوسیال، افت فشار افزایش می‌یابد. همچنین، در اعداد رینولدز پایین (20Re=)، اختلاف افت فشار در کسر حجمی‌های مختلف ناچیز است. برای تمام مقادیر کسر حجمی نانوسیال، مقدار معیار ارزیابی عملکرد (PEC) بیشتر از 1 است که نشان‌دهندۀ بهبود راندمان چاه حرارتی میکروکانالی منیفولدی با استفاده از نانوسیال است. همچنین برای تمام مقادیر رینولدز، معیار ارزیابی عملکرد با افزایش کسر حجمی افزایش می‌یابد. PECmax برای 20 Re= و 02/0%=φ به دست می‌آید. تفاوت چندانی در معیار ارزیابی عملکرد برای کسرحجمی‌های بالاتر (06/0% و 1/0%) و اعداد رینولدز بالاتر (40 تا 100) وجود ندارد.

کلیدواژه‌ها

موضوعات


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