تحلیل میزان اثرگذاری عوامل داخلی و خارجی بر تولید آنتروپی و انتقال حرارت نانوسیال غیرنیوتنی از طریق روش شبکه بولتزمن

نوع مقاله : گرایش پیشرانش و انتقال حرارت

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه یزد، یزد، ایران

2 استاد، دانشکده مهندسی مکانیک، دانشگاه یزد، یزد، ایران

3 دانشیار، گروه مهندسی مکانیک، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، ایران

چکیده

ارزیابی مقدار تولید آنتروپی طی انتقال حرارت جابجایی طبیعی درون محفظه‌ای دوبعدی حاوی نانوسیال غیرنیوتنی، هدف از انجام این پژوهش با استفاده از روش شبکه بولتزمن است. محفظه در معرض جذب/تولید حرارت یکنواخت و میدان مغناطیسی یکنواخت و غیریکنواخت در زوایای مختلف قرار دارد. ویژگی کار حاضر، بررسی اثر تشعشع حجمی و شکل دیواره سرد محفظه در سه شکل صاف، منحنی و مورب بر مشخصات جریان است. کاربرد در طراحی خنک‌کننده‌های الکترونیکی و کلکتورهای خورشیدی ازجمله موارد عملی این تحقیق است. تطابق قابل‌قبول نتایج حاصل‌شده با مطالعات مرتبط قبلی، صحت نتایج ارائه‌شده را تأیید کرد. بر اساس نتایج، وجود پارامتر تشعشع منجر به بهبود انتقال حرارت می‌شود که این اثر به ازای افزایش شاخص توانی سیال مشهودتر است. علاوه بر کاهش عدد ناسلت به ازای افزایش شاخص توانی سیال، اثربخشی وجود میدان مغناطیسی در کاهش مقدار آنتروپی و نرخ انتقال حرارت به ازای کاهش شاخص توانی سیال افزایش می‌یابد. دستیابی به قدرت جریان و عدد ناسلت بالاتر به ترتیب تا حدود 40٪ و 61٪، به ازای اعمال میدان مغناطیسی عمودی و غیریکنواخت امکان‌پذیر است. اگرچه به ازای تولید حرارت، پایین‌ترین مقدار شاخص عملکرد حرارتی و عدد ناسلت وجود خواهد داشت، اما بیشترین اثرگذاری میدان مغناطیسی در حالت تولید حرارت مشاهده می‌شود. با طراحی دیواره به شکل صاف علاوه بر افزایش شاخص عملکرد حرارتی، کاهش عدد بجان نیز مقدور است.

تازه های تحقیق

  • دستیابی به بالاترین مقدار شاخص عملکرد با طراحی دیواره به شکل صاف
  • افزایش میزان اثرگذاری وجود تشعشع حرارتی با افزایش شاخص توانی سیال
  • اثرگذاری کمتر میدان مغناطیسی بر مشخصات حرارتی سیستم با اعمال به‌صورت عمودی و غیریکنواخت

کلیدواژه‌ها

عنوان مقاله [English]

Analysis of Entropy and Heat Transfer of Non-Newtonian Ferrofluid Under the Effect of Various External and Internal Factors

نویسندگان [English]

  • Mohammad Nemati 1
  • Mohammad Sefid 2
  • Arash Karimipour 3
1 Ph.D. Student, Faculty of Mechanical Engineering, Yazd University, Yazd, Iran
2 Corresponding author: Professor, Faculty of Mechanical Engineering, Yazd University, Yazd, Iran
3 Associate Professor, Faculty of Mechanical Engineering, Islamic Azad University, Najafabad Branch, Iran
چکیده [English]

The target of this research is to investigate the amount of entropy production during natural convection inside a 2D chamber containing a non-Newtonian nanofluid using the lattice Boltzmann method. The chamber is exposed to uniform heat absorption/production and uniform and non-uniform magnetic field at different angles. The feature of the present work is to evaluate the effect of thermal radiation and the shape of the cavity cold wall in three shapes: smooth, curved and diagonal on the flow characteristics. Application in the design of electronic coolers and solar collectors is one of the practical cases of this numerical research. Acceptable agreement of the obtained results with previous related studies confirmed the validity of the presented results. Based on the results, the presence of radiation parameter leads to the improvement of heat transfer, which is more evident due to the increase of fluid power-law index. In addition to reducing the Nusselt value for enhancing the fluid power-law index, the effectiveness of the presence of the magnetic field in reducing the entropy and heat transfer rate enhances as the fluid power-law index decreases. It is feasible to attain the flow strength and the Nusselt value up to 40% and 61% more, respectively, by applying a vertical and non-uniform magnetic field. Although for heat production mode, there will be the lowest value of thermal performance index and the Nusselt value, the greatest influence of the magnetic field is observed in the heat production mode. By designing the wall in a smooth shape, in addition to increase the thermal performance coefficient, it is possible to decline the Bejan value.

کلیدواژه‌ها [English]

  • Natural convection
  • Non-Newtonian nanofluid
  • Volumetric radiation
  • Entropy production
  • Uniform heat absorption/production
  • Non-uniform magnetic field

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مراجع

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مکانیک هوافضا
دوره 20، شماره 1 - شماره پیاپی 75
شماره پیاپی 75، فصلنامه بهار
فروردین 1403
صفحه 1-25

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سابقه مقاله

  • تاریخ دریافت: 08 بهمن 1402
  • تاریخ بازنگری: 02 اسفند 1402
  • تاریخ پذیرش: 25 اسفند 1402
  • تاریخ انتشار: 27 فروردین 1403

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