شبیه‌سازی عددی انتقال حرارت و افت فشار سیال شبه‌پلاستیک در مبدل حرارتی لوله‌ای با نوار تابیده اصلاح‌شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، موسسه غیرانتفاعی اروندان، خرمشهر، ایران

2 دانشگاه آزاد اسلامی واخد اهواز، دانشکده فنی مهندسی، گروه مهندسی مکانیک

3 مکانیک، دانشگاه صنعتی قوچان، قوچان، ایران

چکیده

در مقاله حاضر، انتقال حرارت و جریان سیال غیرنیوتنی رقیق‌شونده در یک لوله دایره‌ای تحت شار حرارتی ثابت با نوار تابیده اصلاح‌شده به‌صورت عددی در رژیم آرام، پایا و سه‌بعدی موردبررسی قرارگرفته است. برای حل عددی معادلات حاکم، روش حجم محدود استفاده‌شده و در تحلیل وابستگی میان نرخ تنش و برش، مدل پاورلا اصلاح‌شده بکار رفته است. مدل فیزیکی مسئله یک لوله دایره‌ای دارای نوار تابیده استاندارد و کاهش عرض آن، همچنین یک لوله دایره‌ای با نوار تابیده توخالی و افزایش حفره مرکزی نوار است. کاهش عرض نوار در لوله با نوار تابیده ازنظر بازدهی حرارتی، نامناسب ارزیابی شد. برای بهبود بازدهی حرارتی بجای کاهش عرض نوار، از نوار تابیده توخالی با نسبت‌های مختلف استفاده گردید. همچنین نتایج تحلیل نشان می‌دهد که در نسبت حذف (بخش مرکزی نوار نسبت به عرض اولیه) برابر 3/0 می‌توان در سیالات ذکرشده، به ترتیب 95/17، 49/18 و 69/19 درصد افزایش عملکرد حرارتی نسبت به بهترین حالت عملکرد حرارتی نوار تابیده استاندارد (با نسبت کاهش عرض 9/0) به دلیل تولید آشفتگی و چرخش بیشتر در جریان به دست آورد؛ بنابراین حذف از بخش مرکزی نوار تابیده یک روش مناسب برای افزایش عملکرد حرارتی ارزیابی گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical simulation of heat transfer and pressure drop of pseudo-plastic fluid in a pipe heat exchanger equipped with a modified twisted tape

نویسندگان [English]

  • bahador fathipour 1
  • Ashkan Ghafouri 2
  • kazem mohammadzadeh 3
1 Department of Mechanical Engineering, Arvandan Nonprofit Higher Education Institute, khoramshahr, Iran
2 Departmant of Mechanical Engineering, Islamic Azad University Ahvaz branch, Ahvaz, Iran
3 department of energy engineering, quchan univercity of tecnology, quchan, iran, P.O. box 947771-67335
چکیده [English]

The present paper, heat transfer and flow of shear-thinning non-Newtonian fluids in a circular tube under constant heat flux with a modified twisted tape, have been numerically studied in a laminar, steady-state and three-dimensional regime. The finite volume method was used to numerically solve the governing equations, modified power-law model be used to describe the dependence between the stresses and shear rates. The physical model is a circular tube with a standard twisted tape with decreasing its width, also a hollow tape in circular tube with an increase in the central cavity of the tape. The heat transfer and the overall performance are unfavorable by cutting off the tape edge. Instead, a decrease in tape width ratio, hollow tape with different removal ratios was used to improve thermal efficiency. the numerical results show that the removal ratio (hollow width of the tape divided by the initial width) equal to 0.3 in the fluids with behavioral indexes 0.86, 0.55 and 0.41 can cause 17.95%, 18.49% and 19.69% increase in thermal performance compared to the best thermal performance mode, respectively. Therefore, the hollow twisted tape is a promising technique for laminar convective heat transfer enhancement.

کلیدواژه‌ها [English]

  • Pseudo-Plastics Fluid
  • Modified Twisted Tape
  • Heat transfer enhancement
  • Pipe Heat Exchanger
  • Modified power-law
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