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،دانشگاه امام حسین، تهران، ایران

2 کارشناسی ارشد، دانشگاه امام حسین، تهران، ایران

3 استاد، 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


عنوان مقاله [English]

Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid

نویسندگان [English]

  • iman mahmoodi 1
  • reza gharedagi 2
  • mohammad mehdi- dostdar- 3
1 Master's degree, Imam Hossein University, Tehran, Iran
2 Master's degree, Imam Hossein University, Tehran, Iran
3 Professor, Imam Hossein University, Tehran, Iran
چکیده [English]

In this study, due to the importance of investigating the improvement of heat transfer during the movement of al2o3/water Nano fluid, mixed convection inside a square cavity with a movable cap and baffle was simulated numerically using the finite volume method. The under-study cavity is two dimensional and affecting by gravity and rotating perpendicular to the plane. Right and left walls of the cavity are adiabatic and the upper wall is warm source at a constant temperature. Lower surface is a movable cap that moves from the center to both sides and assumed to be a cold source at constant temperature. The baffle was assumed to be at the same temperature as cold wall and had a height equal to two thirds of the side of the cavity. Experimental data was used for the thermal conductivity coefficient of the Nano fluid. Simulations were performed at a constant Reynolds number to investigate the effects of three parameters of Richardson number, volume fraction of solid particles and cavity slope angle on isothermal lines, streamlines and mean Nusselt value, which created 36 different states. It was found that increasing of slop angle of cavity with respect to reference surface (0 to 90 deg), increasing Richardson number (0.01 to 100) and increasing the volume fraction (0 to 0.05), increase the mean Nusselt value, where the maximum value of which is equivalent to state ,  , . Increasing the volume fraction of the Nano fluid causes an increment in average Nusselt number. It was also observed that at low Richardson values, cavity slope angle has no effect on the results

کلیدواژه‌ها [English]

  • Mixed Convection
  • Cavity
  • Movable Cap
  • Baffle
  • Nano Fluid
  • Numerical Investigation

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