اندرکنش سیال-جامد و انتقال حرارت درون محفظۀ شیب‌دار با پرۀ ارتجاعی

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

عضو هیئت علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.

10.48301/kssa.2023.395506.2538

چکیده

در این مطالعه اثرات برهم­کنش دوطرفه سیال هوا با یک پرۀ ارتجاعی لاستیکی در یک محفظۀ شیب‌دار به روش عددی مدل­‌سازی شده است. دیوار­های بالا و پایین محفظه عایق، دیوار سمت چپ گرم و دیوار سمت راست محفظه، سرد است. هدف این است که به بررسی نرخ انتقال حرارت از دیوار گرم با محاسبۀ عدد ناسلت و تنش فون‌میزز در ریشۀ پره در شیب‌های مختلف محفظه بپردازیم. بدین منظور هندسۀ حل در محیط نرم‌افزار ورکبنچ مدل‌سازی شد. برای حل جریان جابجایی مغشوش (Ra>107) از مدل k-ɛ استفاده‌ شده است. در گام نخست تأثیر وجود پرۀ ارتجاعی در مقایسه با پرۀ صلب بررسی شد و مشخص شد که مقادیر عدد ناسلت به‌عنوان نرخ انتقال حرارت از دیوار گرم برای پرۀ ارتجاعی ۵ درصد بیشتر از پرۀ صلب است. سپس تأثیر شیب محفظه بر میزان انتقال حرارت و عدد و تنش فون­‌میزز در ریشۀ پره بررسی شد. نتایج به‌دست‌آمده حاکی از آن است انتقال حرارت در دیوارۀ گرم با افزایش شیب محفظه از a=0.01 تا a=0.035 حدود ۴ درصد افزایش می‌یابد، حداکثر عدد ناسلت در شیب a=0.035 به‌دست آمد که مقدار بیشنه آن ۴۰ است. همچنین دیده شد که مقدار تنش فون­‌میزز در ریشۀ پره در محفظه با شیب a=0.035 ۴۰ درصد بیشتر از تنش فون‌میزز در ریشۀ پره در محفظه با شیب a=0.01  است. مقدار تنش فون­‌میزز ریشۀ پرۀ نوسانات شدیدی متحمل می‌شود و به سمت یک عدد ثابت میل می‌کند و بعد از چند ثانیه به یک حالت پایا می‌رسد.

کلیدواژه‌ها

عنوان مقاله [English]

Transient Fluid-Solid Interaction and Heat Transfer in an Inclined Cavity with Elastic Baffle

نویسندگان [English]

  • Ayoub Khosravi Farsani
  • Behroz Asadi Borujeni
Instructor, Department of Mechanical Engineering, Technical and Vocational Univercity (TVU), Tehran, Iran.
چکیده [English]

In this study, the effects of fluid-solid interaction with an elastic rubber baffle in an inclined cavity were modelled numerically. In the upper and lower walls of the insulated chamber, the left wall is hot and the right wall is cold. The goal of the present research was to investigate the rate of heat transfer from the hot wall by calculating the Nusselt number and the von Mises stress at the root of the baffle at different slopes of the cavity. For this purpose, the solution geometry was modelled in the workbench software environment. k-ɛ method was used to solve the turbulent displacement flow (Ra>107). First, the effect of the presence of an elastic baffle compared to a rigid baffle was investigated. The values of the Nusselt number as the heat transfer rate from the hot wall for the elastic Baffle were 5% higher than the rigid Baffle. Then, the effect of the Inclined Cavity on the heat transfer rate, Nusselt number and von Mises stress in the root of the baffle was investigated. The heat transfer in the hot wall increased by approximately 4% with an increase in the slope of the cavity from a=0.01 to a=0.035. The maximum Nusselt number was obtained at slope a=0.035, and its maximum value was 40. It was also observed that the von Mises stress in the vane root in the cavity with a slope of a=0.035 was 40% higher than the von Mises stress in the vane root in the cavity with a slope of a=0.01. The Von Mises stress value of the root of the baffle underwent severe fluctuations tending towards a constant number and reaching a steady state after a few seconds.

کلیدواژه‌ها [English]

  • Natural Convection
  • Fluid-Solid Interaction
  • Heat Transfer
  • Elastic Baffle
  • Inclined Cavity

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فصلنامه علمی کارافن
دوره 20، شماره 3
فنی و مهندسی
آذر 1402
صفحه 107-128

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سابقه مقاله

  • تاریخ دریافت: 19 اردیبهشت 1402
  • تاریخ بازنگری: 05 تیر 1402
  • تاریخ پذیرش: 08 شهریور 1402

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