مقایسه مدل‌های تک فاز و دوفاز در پیش بینی عملکرد هیدرودینامیکی و گرمایی نانوسیال

نوع مقاله : ترویجی

نویسندگان

1 دانشیار دانشکده مهندسی شیمی، نفت و گاز، دانشگاه سمنان، سمنان، ایران

2 دانشجوی کارشناسی ارشد مهندسی شیمی، دانشگاه سمنان، سمنان، ایران

چکیده

در این مقاله مدل‌های تک فازی و دوفازی، برای پیش­بینی عملکرد هیدرودینامیکی و گرمایی نانوسیال معرفی می­شود. نانوسیال به عنوان محیط جدید انتقال حرارت، از پراکندن­ نانوذرات در ساخته می­شود. در مدل­های تک فازی فرض می­شود نانوسیال مانند سیال مجازی همگن رفتار می­کند. در مدل‌های دوفازی اندرکنش‌های بین ذرات و سیال نیز در نظر گرفته می‌شوند. هر دو نوع مدل در هیدرودینامیک پیش بینی یکسانی دارند، اما در توزیع دما تفاوت دارند. زیرا عوامل موثر انتقال حرارت در مدل­های دوفازی لحاظ می­شود. در غلظت کم نانو ذرات، می‌توان از اثرات ذرات فاز پراکنده بر میدان جریان فاز پیوسته صرف نظر و از مدل تک فازی استفاده کرد. در غلظت زیاد، برهم‌کنش میان ذرات و سیال مهم شده لازم است مدل‌های دوفازی به کار گرفته ‌شوند. با توجه به نوع مساله، امکانات موجود و دقت مورد نیاز، می توان از مدل­های تک فاز و یا دو فاز استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of single-phase and two-phase models on Hydrodynamic and thermal performance prediction of nanofluid

نویسندگان [English]

  • faramarz hormozi 1
  • zahra sarbazi 2
1 Associate Professor of Chemical Engineering, Faculty of Chemical Engineering, Oil and Gas, Semnan University, Semnan, Iran
2 Master of Chemical Engineering,Faculty of Chemical Engineering, Oil and Gas, Semnan University, Semnan, Iran
چکیده [English]

In this paper, single and two-phase CFD models are introduced for predicting the thermo-hydraulic behavior of nanofluids. In single-phase models, behavior of nanofluid is similar to that of observed in conventional fluids and interactions between particles and base fluid are negligible. In two-phase models, interactions between nanoparticles and base fluid is taken into consideration. Both models showed the identical prediction for the heat transfer behavior, however, the temperature distribution of nanofluid was different, since in two-phase model, the parameters affecting the heat transfer are considered in the model. At low concentrations of nanofluid, it is a logical assumption to ignore the influence of dispersed phase (nanoparticle) on the flow field (continuous phase). Thus, the single phase is suitable for low-concentration nanofluids, while two-phase model is appropriate for nanofluids with high concentrations. Overall, one can use single or two-phase models depending on the type of problem, available computational facilities and accuracy.

کلیدواژه‌ها [English]

  • Nanofluids
  • Computational Fluid Dynamics
  • Single-Phase Model
  • Two-phase Model
  • Heat Transfer

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