مدل سازی عددی اثر انتقال نانو ذرات در جریان جابه‌جایی ترکیبی نانوسیال با خواص متغیر در محفظه مربعی با درگاه ورود و خروج جریان

نویسندگان

دانشگاه کاشان

چکیده

میدان جریان، انتقال حرارت و انتقال ذرات در جابه‌جایی ترکیبی نانوسیال آب- اکسید آلومینیوم با فرض مخلوط غیر همگن در محفظه مربعی با درگاه ورود و خروج جریان به‌صورت عددی مدل‌سازی شده است. برای حل معادلات حاکم به صورت بی‌بعد، از روش حجم محدود استفاده شده و ارتباط میدان سرعت و فشار با الگوریتم سیمپلر برقرار شده است. مکانیزم‌های انتقال نانوذرات شامل ترموفرسیس، نفوذ براونی و اثر دوفور که سبب عدم یکنواختی غلظت نانوذرات می‌شوند، به عنوان مدل انتقال نانوذرات در نظر گرفته شده و مسئله برای کسرحجمی نانوذرات در محدوده 0 ≤ φb ≤ 0.04، عدد ریچاردسون در محدوده 0.01 ≤ Rif,0 ≤ 1 و دو عدد گراشف Grf,0=104 , 105 بررسی شده است. بر اساس نتایج به‌دست آمده مشاهده شده است که، در جابه‌جایی ترکیبی افزایش کسر حجمی و همچنین افزایش عدد گراشف در تمام محدوده اعداد ریچاردسون، منجر به افزایش انتقال حرارت می‌شود و مدل انتقال با تاثیر گذاری بر غلظت نانوذرات در محفظه سبب تاثیر بر میزان سرعت جریان و انتقال حرارت می‌شود، به‌گونه‌ای که در اختلاف دمای پایین مدل همگن و در اختلاف دمای بالا مدل انتقال، عدد ناسلت متوسط بیشتری پیش‌بینی می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical modeling of nanoparticles transport effect in mixed convection of nanoï‌‚uid with variable properties in a square cavity with inlet and outlet port

نویسندگان [English]

  • G. A. Sheikhzadeh
  • S.P. Ghaffari
چکیده [English]

In this paper, the flow field, heat transfer and nanoparticles transport in Al2O3-water nanofluid mixed convection in a square enclosure with inlet and outlet port has been studied numerically. The dimensionless transport equations are solved numerically with a finite volume approach using the SIMPLER algorithm. Nanoparticles transport mechanisms such as Brownian diffusion, thermophoresis and Dufour effect that cause non-uniform concentration distribution are intended in nanoparticles transport model. The study has been carried out for the nanoparticles volume fraction in the range 0 ≤ φb ≤ 0.04, Richardson numbers 0.01 ≤ Rif,0 ≤ 1with two Grashof number Grf,0=104 , 105. The results show that in mixed convection by increasing volume fraction of nanoparticles and the Grashof number for each Richardson number, the average Nusselt number increases and the transport model by affecting on nanoparticles concentration influence the amount of flow velocity and heat transfer so that in low temperature difference homogenous model and at high temperature difference the transport model predicts higher average Nusselt number.

کلیدواژه‌ها [English]

  • numerical study
  • Transport model
  • Thermophoresis
  • Brownian diffusion
  • Mixed convection

 

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