مطالعه عددی انتقال حرارت و افت فشار در جریان اجباری نانوسیال داخل لوله‌‌ دندانه‌دار

نوع مقاله: پژوهشی

نویسندگان

1 دانشگاه اصفهان

2 دانشگاه شهرکرد

چکیده

انتقال حرارت و افت فشار در جریان نانوسیال آب- اکسید آلومینیم در لوله‌ای با دندانه‌های داخلی به صورت عددی مورد مطالعه قرار گرفته است. معادلات حاکم بر جریان آرام سیال تراکم‌ناپذیر به همراه روابط مربوط به تغییرات خواص نانوسیال به کمک روش حجم محدود با استفاده از الگوریتم سیمپل حل شده‌اند. اثر پارامترهای مختلف جریان و همچنین تاثیر فاصله بین دندانه‌های لوله و کسرحجمی نانوذرات بر انتقال حرارت در این لوله‌ها مورد مطالعه قرار گرفته است. نتایج بدست آمده نشان می‌دهد که با افزایش میزان نانوذرات در سیال پایه، توسعه‌ یافتگی حرارتی سریعتر اتفاق افتاده و درنتیجه انتقال حرارت افزایش می‌یابد. مشاهده شد که افزایش 5 درصدی کسرحجمی نانوذرات، منجر به افزایش عدد نوسلت موضعی نانوسیال به میزان حداکثر 28 درصد و نوسلت متوسط به میزان 11 درصد شده است. در همین حالت، ضریب اصطکاک روی دیوار لوله نیز در حدود 5/1 برابر شده است. نتایج همچنین نشان می‌دهد که با افزایش پنج برابری فاصله بین دندانه‌های داخلی لوله، نوسلت متوسط در عدد رینولدز 100 به میزان 45/2 برابر افزایش داشته است.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical Study of Heat Transfer and Pressure Drop in Forced-convection Nanofluid flow through an internally ribbed pipe

نویسندگان [English]

  • Masoud Ziaei-Rad 1
  • Maryam Beigi-Harchegani 2
چکیده [English]

Heat transfer and pressure drop in Al2O3-water nanofluid flow through an internally ribbed pipe is studied numerically. The governing conservation equations in cylindrical coordinates for laminar incompressible flow are solved using well-known SIMPLE algorithm based on finite-volume method. The effects of flow parameters, the distance between the pipe ribs, and the volume fraction of nanoparticles, on heat transfer and friction coefficient are investigated. The obtained results illustrate that increasing nanoparticles volume fraction makes the thermal entrance length decrease, and consequently, the heat transfer gets increased. It also reveals that 5% of increment in nanoparticles volume fraction may lead to 28-percent rise in local Nusselt number and about 11-percent rise in average Nusselt number. In this case, the friction factor will also increase about 1.5 times in comparison with the pure fluid ones. The results also show that increasing the pipe ribs distance by five times in Re=100, will make the average Nusselt number increase by 2.45 times.

کلیدواژه‌ها [English]

  • Internally ribbed pipe
  • Nanofluid flow
  • Force convection
  • Heat transfer
  • Numerical Solution


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