ارزیابی عددی میزان آنتروپی تولید شده تحت اثر میدان مغناطیسی و جذب/تولید گرما به واسطه انتقال حرارت دوگانه نانوسیال ترکیبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه یزد، یزد ، ایران

2 دانشکده مهندسی مکانیک دانشگاه یزد، یزد ، ایران

چکیده

در مطالعه حاضر، میزان آنتروپی تولید شده ناشی از انتقال حرارت دوگانه نانوسیال ترکیبی درون محفظه K شکل تحت اثر میدان مغناطیسی یکنواخت و غیریکنواخت و جذب/تولید گرما یکنواخت بررسی شده است. شبیه‌سازی با نوشتن کد رایانه‌ای به زبان فرترن و با استفاده از روش شبکه بولتزمن صورت پذیرفته است. تغییرات عدد رایلی، عدد هارتمن، ضریب جذب/تولید گرما، نسبت هدایت حرارتی، نسبت ابعاد محفظه و نوع اعمال میدان مغناطیسی و کسر حجمی نانوذرات به عنوان متغیرهای اصلی این بررسی مورد ارزیابی قرار گرفته‌اند. نتایج نشان داد می‌توان قدرت جریان، میزان انتقال حرارت و آنتروپی تولید شده را با اعمال میدان مغناطیسی کاهش داد. کاهش کمتر عدد ناسلت متوسط با غیر یکنواخت اعمال کردن میدان مغناطیسی حاصل می‌شود. افزایش ضریب جذب/تولید گرما به دلیل افزایش دمای مجموعه منجر به کاهش عدد ناسلت متوسط می‌شود که این اثر با افزایش عدد هارتمن، بیشتر می‌شود. افزودن نانوذرات به سیال پایه در حالتی که هدایت پدیده غالب است، موجب افزاش میزان انتقال حرارت می‌شود. انتقال حرارت تابعی از نسبت ضریب هدایت حرارتی و عدد رایلی بوده و افزایش این دو پارامتر اثرات جابجایی را افزایش می‌دهد و در این شرایط، اثر افزایش عدد هارتمن نمایان‌تر است. افزایش نسبت ابعاد محفظه منجر به کاهش عدد ناسلت متوسط و آنتروپی شده ولی اثر افزودن نانوذرات در این حالت بیشتر است. آنتروپی تولیدی با افزایش عدد هارتمن کاهش و با افزایش عدد رایلی و ضریب جذب/تولید گرما افزایش می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of Amount the Entropy Production Due to MHD Hybrid Nanofluid Conjugate Heat Transfer with Heat Absorption/Generation

نویسندگان [English]

  • Mohammad Nemati 1
  • mohammad sefid 2
1 Faculty of mechanical engineering, Yazd university
2 departmen of mechanical engineering
چکیده [English]

In the present study, the entropy production due to the conjugate heat transfer of the hybrid nanofluid inside the K-shaped chamber under a uniform and non-uniform magnetic field under impact of a uniform heat absorption/generation is evaluated. Variations in the Rayleigh number, volumetric fraction of nanoparticles, Hartmann number, heat absorption/generation coefficient, thermal conductivity ratio, chamber aspect ratio and type of  applied  magnetic field have been studied. The outcomes showed that the flow strength and the amount of heat transfer could be reduced by about 55% and 21% by applying a magnetic field, respectively. By applying a non-uniform magnetic field compared to uniform mode, the flow strength can be increased up to about 38 and the average Nusselt number up to about 16%. Increasing the heat absorption/generation coefficient due to increasing the set temperature leads to decreasing the mean Nusselt number, which this influence increases with increasing the Hartmann number. Addition of nanoparticles to the base fluid in which the conduction of the phenomenon is predominant increases the rate of heat transfer. Heat transfer is a function of the ratio of thermal conductivity and Rayleigh number that increasing these two parameters increases the convection effects, and in this case, the effect of increasing the Hartmann number is more pronounced. Increasing the thermal conductivity ratio from 0.5 to 10 increases the amount of heat transfer by 21 times. Increasing the chamber aspect ratio leads to a decline in the mean Nusselt number and entropy production, but the effect of adding nanoparticles is greater in this case. Entropy production decreases with increasing Hartmann number and increases with Rayleigh number and heat absorption/generation coefficient.

کلیدواژه‌ها [English]

  • Conjugate heat transfer
  • Hybrid Nanofluid
  • Non Uniform Magnetic Field
  • Variation of Aspect Ratio
  • Entropy Production
  • Uniform Heat Absorption/Generation
  • Lattice Boltzmann Method

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  • تاریخ دریافت: 10 دی 1400
  • تاریخ بازنگری: 04 بهمن 1400
  • تاریخ پذیرش: 07 اسفند 1400
  • تاریخ انتشار: 01 اسفند 1400

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