تحلیل عددی تأثیر چیدمان دو استوانه چرخان بر افزایش انتقال حرارت جریان نانوسیال ترکیبی درون یک محفظه باز

نوع مقاله : مقاله پژوهشی

نویسنده

دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

چکیده

در مقاله حاضر، تأثیر چیدمان‌های مختلف دو استوانه چرخان درون یک محفظه باز دارای دریچه‌های ورودی و خروجی بر الگوی جریان و افزایش انتقال حرارت جابجایی اجباری نانوسیال ترکیبی اکسید آلومینیوم-مس با پایه آب در محدوده رژیم آرام به صورت عددی مورد مطالعه قرار گرفته است. در این مطالعه، تأثیر پارامترهایی از قبیل چیدمان استوانه‌ها (A، B، C و D)، و همچنین سرعت زاویه‌ای چرخش استوانه‌ها (10- الی 10+)، عدد رینولدز (100 الی 500) و کسر حجمی نانوذرات 0/5 الی 3 درصد) بر الگوی جریان و انتقال حرارت بررسی شده است. نتایج حاکی از آن است که چیدمان D نسبت به سایر چیدمان‌ها، دارای بیشترین مقدار افزایش انتقال حرارت و شاخص ارزیابی عملکرد می‌باشد. همچنین نتایج نشان می‎دهد که با افزایش سرعت زاویه‌ای استوانه‌ها، عدد رینولدز جریان ورودی به محفظه و کسر حجمی، شاخص ارزیابی عملکرد افزایش می‌یابد. همچنین با چرخش استوانه‌ها در جهت پادساعتگرد نسبت به چرخش ساعتگرد، شاخص ارزیابی عملکرد افزایش چشمگیری یافته و حدو1/30 برابر می‌شود. همچنین نتایج نشان می‌دهد که نانوسیال ترکیبی اکسید آلومینیوم-مس با پایه آب، موجب افزایش عدد ناسلت متوسط نسبت به نانوسیال مس با پایه آب و همچنین افزایش شاخص ارزیابی عملکرد نسبت به نانوسیال اکسید آلومینیوم با پایه آب می‌شود.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Analysis of the Effect of Configurations of Double Rotating Cylinders on Heat Transfer Enhancement Hybrid Nanofluid Flow in a Vented Cavity

نویسنده [English]

  • Hesam Moayedi
Thermo-Fluids Department, Faculty of Mechanical Engineering, University of Guilan, Iran
چکیده [English]

In this paper, the effect of configurations of rotating cylinders in a vented cavity with inlet and outlet port on the flow field and heat transfer enhancement of forced convection of Al2O3/Cu-water hybrid nanofluid flow in the laminar regime is numerically investigated. In this study, the influence of parameters as configurations of cylinders (A, B, C, and D), as well as the rotational velocity of cylinders (from -10 to +10), Reynolds number (from 100 to 500), and the volume fraction of nanoparticles (from 0.5% to 3%) on the flow field and heat transfer are studied. Results indicate that the average Nusselt number and the Performance Evaluation Index for configuration D are higher than other configurations. Also, it is obvious that by increasing the rotational velocity of cylinders, Reynolds number, and the volume fraction of nanoparticles, the Performance Evaluation Index increases. Also, by rotating the cylinders in the counterclockwise rotation direction with respect to the clockwise rotation direction, the η increases about 1.30. The results show that Al2O3/Cu-water hybrid nanofluid causes heat transfer enhancement compared to the Cu-water nanofluid and it increases the Performance Evaluation Index compared to the Al2O3-water nanofluid.

کلیدواژه‌ها [English]

  • Numerical analysis
  • Vented cavity
  • Hybrid nanofluid
  • Rotating cylinders
  • Heat transfer
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