اثر مدل توربولانس بر شبیه سازی عددی جریان آشفته نانوسیال در یک لوله افقی

نوع مقاله: مقاله مکانیک

نویسندگان

1 گروه مکانیک، دانشکده فنی مهندسی، دانشگاه صنعتی قم، قم، ایران.

2 گروه مکانیک، دانشکده فنی- مهندسی، دانشگاه صنعتی قم، قم، ایران

چکیده

با توجه به کاربرد روز افزون استفاده از نانوسیال به عنوان سیال عامل خنک کننده و همچنین گسترش مدل سازیهای عددی به منظور کاهش زمان و هزینه طراحی، در این پژوهش، جریان مغشوش نانوسیال آب- اکسید سیلیسیم و آب- اکسید مس برای دو شرایط مختلف در یک لوله افقی تحت شار حرارتی ثابت به صورت عددی شبیه سازی شده است. برای مدلسازی جریان آشفته، چندین مدل توربولانس دو معادله ای و یک مدل تنش رینولدز موجود در نرم افزار فلوئنت با هدف بررسی عملکرد آنها مورد استفاده قرار گرفته است. همچنین تخمین خواص ترموفیزیکی نانوسیال با استفاده از رویکرد تک فاز انجام گرفته است. برای آگاهی از مقادیر خطای حاصل از شش مدل توربولانس مورد استفاده، نتایج به دست آمده در مطالعه حاضر با داده های آزمایشگاهی مقایسه شده اند تا بتوان در نهایت مدل توربولانسی که تطابق بهتری با داده های آزمایشگاهی در طیف وسیع تری از شرایط جریان دارد را مشخص کرد. به همین منظور بیش از 500 اجرا در اعداد رینولدز مختلف، کسر حجمی های مختلف برای دو عدد بدون بعد ناسلت و ضریب اصطکاک انجام شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Turbulence Model on Numerical Simulation of Turbulent Flow of Nanofluids in a Horizontal Pipe

نویسندگان [English]

  • Sajjad Eslami 1
  • Mahdi Mohseni 2
1 Department of Mechanical Engineering, Qom University of Technology, Qom, Iran.
2 Department of Mechanical Engineering, Qom University of Technology, Qom, Iran
چکیده [English]

One of the main techniques in the enhancement of heat transfer during recent decades is utilization of nanofluids. In this study, the forced convective turbulent flow of CuO-H2O and SiO2-H2O nanofluids have been numerically investigated. The results obtained for two different conditions in a horizontal tube under constant wall heat flux. In order to investigate the performance of turbulence models, various two-equation turbulence models as well as one Reynolds stress model, exist in ANSYS-FLUENT package, are used to modeling the turbulent flow. The single phase approach also, is used to estimte the thermo physical properties of the nanofluids. The Nusselt number or equivalently the heat transfer coefficient, and the friction factor are calculated in fully developed region of the flow. The experimental data are also used for the sake of comparison and to find which turbulence models has the best performance. To accomplish this, more than 500 runs have been carried out for various Reynolds number as well as different volume fractions up to 4 percent for two dimensionless number of Nusselt and friction factor.

کلیدواژه‌ها [English]

  • Nanofluid
  • turbulent flow
  • turbulence model
  • convective heat transfer
  • Numerical Solution

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