عملکرد هیدرولیکی- حرارتی پره ذوزنقه‌ای مجهز به مولد گردابه و حفره: بررسی اثر موقعیت مولد گردابه و حفره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه کاشان، کاشان،ایران

2 دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

3 دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد شاهرود، شاهرود، ایران

4 دانشیار مهندسی مکانیک دانشکده مهندسی مکانیک دانشگاه کاشان کاشان ایران

چکیده

امروزه موضوع افزایش انتقال حرارت، توجه زیادی از محققین را برای توسعه انواع مبدل‌های حرارتی به‌ منظور دستیابی به راندمان بالا، هزینه پایین، وزن سبک و ابعاد کوچکتر، به خود جلب کرده است، در مقاله حاضر با تعبیه مولد گردابه و حفره و جایابی مناسب موقعیت آن‌ها روی پره ذوزنقه‌ای، ضریب انتقال حرارت و افت فشار مورد بررسی قرار گرفته است. به این منظور مدل‌سازی عددی جریان سیال آب در یک کانال مستطیلی در دو رژیم آرام و آشفته و برای 5 مدل با موقعیت‌های مختلف قرارگیری مولد گردابه و حفره برای پارامترهای هندسی در اندازه ثابت صورت گرفته است. نتایج نشان داد که در هر دو رژیم جریان، با قرارگرفتن حفره در بالا و پایین، افت فشار افزایش می‌یابد. به منظور انجام مقایسه بهتر بین این موقعیت‌ها، نسبت ضریب کالبرن به ضریب اصطکاک به دو صورت ساده و توانی تعریف و به کار برده شد و بهترین عملکرد هیدرولیکی- حرارتی برای پره ذوزنقه‌ای با وجود مولد گردابه در راست و همزمان حفره در وسط، به دست آمد به طوری‌که در رژیم جریان آشفته، بیشترین مقدار برای نسبت ضریب کالبرن به ضریب اصطکاک (نسبت ساده و نسبت توانی آن) به ترتیب برابر با 0539/0 و 01504/0 برای این موقعیت گزارش شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Hydrothermal performance of trapezoidal fin equipped with vortex generator and hole: Investigation of the effect of vortex generator and hole position

نویسندگان [English]

  • faezeh nejati barzoki 1
  • Ghanbar Ali Sheikhzadeh 2
  • morteza khoshvaght Aliabadi 3
  • Ali Akbar Abbasian Arani 4
1 Department of Mechanical Engineering, University of Kashan, Kashan, Iran.
2 Heat and Fluids Department, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
3 Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran
4 Associate Professor Mechanical Engineering Department University of Kashan Kashan Iran
چکیده [English]

Today, the issue of increasing heat transfer has attracted a great deal of attention from researchers for the development of a variety of heat exchangers to achieve high efficiency, low cost, lightweight. In this paper, the hydrothermal performance is investigated by incorporating vortex generator and hole and their proper positioning on trapezoidal fin. For this purpose, numerical modeling of water flow in a rectangular channel is performed in two laminar and turbulent flow regimes and for 5 models with different positions of vortex generator and hole in constant size geometric parameters. The results showed that in both flow regimes, the pressure drop was increased by inserting the hole on top and bottom. To create a better comparison, the ratio of the Colburn factor to friction factor was defined and applied in two simple and powerful ways and the best hydraulic-thermal performance was obtained for the trapezoidal fin with the vortex generator on the right and the hole in the middle, so that in the turbulent flow regime, the highest value for the ratio of Colburn factor to friction factor (simple ratio and power ratio) was reported as 0.0539 and 0.01504 for this position, respectively.

کلیدواژه‌ها [English]

  • Trapezoidal fin
  • Vortex generator position
  • Hole position
  • Pressure drop
  • heat transfer coefficient
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