بررسی اثر قطر نانوذرات بر جابجایی آزاد نانوسیال آب- اکسید آلومینیوم با استفاده از مدلهای تکفازی و دوفازی

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

میثم اسفندیاری ¹ (دانشجو)
بابک مهماندوست ² ()
آرش کریمی پور ³ (هیأت علمی)

Received: 2015-12-21 Accepted : 2016-01-25 Published : 2016-04-20

Keywords: حرکت براونی, نانوسیال, جابجایی آزاد, ترموفرسیس, مطالعه عددی,

Abstract :

در این پژوهش، اثر قطرنانوذرات در جابجایی آزاد نانوسیال آب- اکسید آلومینیوم در یک محفظه با مدل دو فازی و تک‌فازی بررسی شده است. محدوده عدد رایلی 105 تا 107 در کسر حجمی‌های 01/0 تا 03/0 برای نانوذرات با قطر-های گوناگون (25، 33، 50 و 100) نانومتر در نظر گرفته شده است. با توجه به طبیعت دو‌فازی بودن نانوسیال‌ها، نیاز به مدلسازی با استفاده از این در حال افزایش است. فرض تک‌فازی (بر خلاف دو فازی) برای نانوسیال‌ها بر این اساس است که رفتار‌های هر دو فازجامد (نانوذرات) و فاز مایع (سیال پایه) کاملاً مشابه هستند. در این مطالعه، از دیدگاه اویلری- اویلری و مدل مخلوط با توجه به اثرات حرکت براونی و ترموفرسیس استفاده شده است. حرکت براونی و ترموفرسیس به ترتیب تحت اثرات گرادیان کسر حجمی و گرادیان دما بوجود می‌آیند که سبب بوجود آمدن لغزش میان نانوذرات و سیال پایه می‌شوند؛ بنابراین، نوعی ناهمگنی در رفتار میان نانوذرات و سیال پایه بوجود می‌آید. این ناهمگنی منجر به اثرات قابل توجهی در نتایج مدل‌سازی دو‌فازی می‌شود که تطابق بهتری نسبت به مدل‌سازی تک‌فازی با نتایج تجربی ایجاد می‌کند. نتایج نشان می‌دهند که با افزایش قطر و مقدار کسر حجمی نانوذرات انتقال حرات کاهش می‌یابد. همچنین، اثر قطر نانوذرات بر جریان و انتقال حرارت محسوس است.

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