فصلنامه علمی کارافن

فصلنامه علمی کارافن

شبیه‌سازی عددی جریان آرام نانو سیال در لوله‌های خمیده با مقطع مربعی

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان
عضو هیئت علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران
چکیده
در این مقاله انتقال حرارت جابه‌جایی اجباری جریان نانو سیال در لوله‌های خمیدۀ افقی با مقطع چهار وجهی، تحت شار حرارتی به روش عددی بررسی شده است. از نانو سیال همگن ذرات اکسید آلومینیوم و آب به‌عنوان سیال پایه استفاده شده است. معادلات پیوستگی، مومنتوم و انرژی و روش حجم کنترل برای حل عددی جریان به کار گرفته شده­اند. در این مطالعه اثرات جریان­های ثانویه و نیروی گریز از مرکز و شناوری بر میدان جریان در نظر گرفته شده است و همچنین به بررسی تأثیر عدد رینولدز، کسر حجمی ذرات جامد، اثر سطح خمیده در هندسه­های مختلف بر میزان انتقال حرارت و افت فشار پرداخته شده است. نتایج در قالب خطوط هم­تراز جریان و دما و همچنین نمودارهای عدد ناسلت و فشار ارائه گردیده است. انتقال حرارت و افت فشار در غلظت­های مختلف ذرات جامد و اعداد رینولدز مختلف با هم مقایسه شده است. نتایج بیانگر آن است که با افزایش کسر حجمی ذرات جامد از 0 تا 5 درصد انتقال حرارت تا 10 درصد و افت فشار 100 درصد افزایش می­یابد همچنین با افزایش عدد رینولدز از 100 تا 900 انتقال حرارت و افت فشار درون زانویی تا دو برابر افزایش می‌یابند. با توجه به نتایج سطح مقعر از داخل لوله تأثیر بیشتری در انتقال حرارت نسبت به سطح محدب ایفا می‌کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Simulation of Laminar Nanofluids Flow in a Curved Duct with a Square Cross-section

نویسندگان English

Behrooz Asadi Boroojeni
Ayoub Khosravi Farsani
Instructor, Department of Mechanical Engineering, Technical and Vocational Univercity (TVU),Tehran, Iran.
چکیده English

In this article, the forced displacement heat transfer of nanofluid flow in horizontal curved tubes with a four-sided cross-section, under heat flux, was numerically simulated. A homogeneous nanofluid of aluminium oxide particles and water was used as the base fluid. Continuity, momentum and energy equations and the control volume method were used to numerically solve the flow. In this study, the effects of secondary flows, centrifugal force, and buoyancy on the flow field were considered, and the effect of the Reynolds number, volume fraction of nanoparticles and the effect of the curved surface in different geometries on the amount of heat transfer and pressure drop were investigated. The results are presented in the contour of flow and temperature parallel lines as well as Nusselt number and pressure graphs. Heat transfer and pressure drop in different concentrations of solid particles and different Reynolds numbers were compared. The results demonstrated that by increasing the volume fraction of solid particles from 0 to 5%, the heat transfer increased by up to 10% and the pressure drop increased by 100%. In addition, by increasing the Reynolds number from 100 to 900, the heat transfer and pressure drop inside the elbow increased by up to two times. According to the results, the concave surface from inside the tube has a greater effect on heat transfer than the convex surface.

کلیدواژه‌ها English

Laminar Flow
Nusselt Number
Curved Tube
Pressure Drop
Heat Transfer
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دوره 21، شماره 1 - شماره پیاپی 66
فنی و مهندسی
بهار 1403
صفحه 411-433

  • تاریخ دریافت 20 آذر 1402
  • تاریخ بازنگری 05 بهمن 1402
  • تاریخ پذیرش 12 اسفند 1402