بررسی عددی جابه‌جایی ترکیبی در یک حفره‌ تیغه دار با درپوش متحرک حاوی نانوسیال آلومینیوم اکسید/آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد،دانشکده و پژوهشکده فنی و مهندسی، دانشگاه امام حسین، تهران، ایران

2 کارشناسی ارشد، دانشکده و پژوهشکده فنی و مهندسی، دانشگاه امام حسین، تهران، ایران

3 استاد، دانشکده و پژوهشکده فنی و مهندسی، دانشگاه امام حسین، تهران، ایران

چکیده

در این مطالعه، به دلیل اهمیت بررسی بهبود انتقال حرارت هنگام حرکت نانوسیال آلومینیوم اکسید/آب، جابه‌جایی ترکیبی درون حفره‌‌ مربعی با درپوش متحرک همراه با تیغه به صورت عددی و با روش حجم محدود شبیه‌سازی شده است. حفره‌ی مورد بررسی دو بعدی بوده و تحت تأثیر گرانش قرار دارد و در راستای عمود بر صفحه، دوران می‌کند. دیوارهای راست و چپ حفره آدیاباتیک بوده و دیوار بالا، منبع گرم در دمای‌ ثابت است. سطح پایین حفره، درپوش متحرکی است که حرکتی از مرکز به دو طرف داشته و به عنوان منبع سرد در دمای ثابت فرض شده‏است. تیغه داخل حفره نیز در دمایی مشابه با دیوار سرد فرض شده و دارای ارتفاعی معادل دو سوم ضلع حفره است. برای ضریب هدایت حرارتی نانوسیال از داده‌های تجربی استفاده می‌شود. شبیه‌سازی‌ها در عدد رینولدز ثابت ( ) و به‌منظور بررسی تاثیرات سه پارامتر زاویه شیب حفره، عدد ریچاردسون و کسر حجمی ذرات جامد بر خطوط هم­دما، خطوط جریان و مقدار ناسلت متوسط انجام می‌شوند که 36 حالت مختلف را به وجود می‌آوردند. از این 36 حالت برای مسئله، ملاحظه می‌گردد که افزایش زاویه شیب حفره با سطح مرجع (0 تا 90 درجه)، افزایش عدد ریچاردسون (01/0 تا 100) و افزایش کسر حجمی (0 تا 05/0) باعث افزایش مقدار ناسلت متوسط شده و بیشترین مقدار آن معادل حالت ،  و  است. افزایش کسر حجمی نانوسیال باعث افزایش تا 59/25 درصد در مقدار ناسلت متوسط می‌شود. همچنین نشان داده می‌شود که در مقادیر کم عدد ریچاردسون (معادل 01/0 در مسئله‌ی مورد بررسی)، زاویه شیب حفره تاثیری در پاسخ مسئله ندارد.

کلیدواژه‌ها


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