فصلنامه علمی کارافن

فصلنامه علمی کارافن

مطالعۀ عددی جریان و انتقال حرارت نانوسیال مغناطیسی در یک مجرا سه راهی در حضور میدان مغناطیسی متغیر

نوع مقاله : مقاله پژوهشی (نظری)

نویسنده
عضو هیئت علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.
چکیده
جریان نانوسیال مغناطیسی در یک مجرا سه راهی که تحت میدان مغناطیسی متغیر است، به صورت عددی با استفاده از مدل تک فازی مخلوط، مورد بررسی قرار گرفته است. هدف از بررسی این تحقیق، افزایش انتقال حرارت به کمک اعمال میدان مغناطیسی در یک مجرا سه راهی می‌باشد. در این مجرا سطح بیرونی قسمت مورب به صورت عایق است و هیچ گونه انتقال حرارتی با فضای بیرون انجام نمی‌دهد. قسمت صاف به صورت دما ثابت و با دمای کمتر از دمای نانوسیال مغناطیسی می‌باشد و میدان مغناطیسی عمود بر مجرا وارد شده است. آب به عنوان سیال پایه در نظر گرفته شده است و 4% نانو ذره اکسید آهن (〖Fe〗_3 O_4) به آن افزوده می‌شود. تغییر پارامترهایی نظیر عدد بی‌بعد شدت میدان مغناطیسی و عدد بی‌بعد رینولدز بر انتقال حرارت مورد بررسی قرار گرفته است. اثرات میدان مغناطیسی با نوشتن کدهایی به زبان C++، به معادلات حاکم بر جریان نانوسیال مغناطیسی در نرم افزار انسیس فلوئنت اضافه شده است. با توجه به نتایج به دست آمده، مقدار عدد ناسلت با افزایش عدد رینولدز، 72 درصد افزایش می-یابد و با اعمال میدان مغناطیسی نسبت به حالت بدون حضور میدان مغناطیسی، مقدار عدد ناسلت 63/48 درصد افزایش می‌یابد. زیرا در اثر اعمال میدان مغناطیسی باعث تشکیل یک جفت گردابه در نانوسیال مغناطیسی می‌شود که این گردابه باعث نفوذ لایۀ مرزی خنک در قسمت‌های مرکزی مجرا می‌شود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Study of Flow and Heat Transfer of Magnetic Nanofluid in a Tee Channel in the Presence of Variable Magnetic Field

نویسنده English

Seyed valiallah Mousavi
Faculty Member, Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده English

The The flow of magnetic nanofluid in a three-way duct under varying magnetic fields has been investigated numerically using the mixed single-phase model. This research aimed to increase heat transfer by applying a magnetic field in a tee duct. In this conduit, the outer surface of the diagonal part was insulated and did not conduct any heat transfer with the outside space. The smooth part was at a constant temperature and with a temperature lower than the temperature of the magnetic nanofluid, and the magnetic field was inserted perpendicular to the channel. Water was considered as the base fluid and 4% iron oxide nanoparticles ( ) were added to it. The change of parameters such as the dimensionless number of the magnetic field intensity and the dimensionless Reynolds number on heat transfer were investigated. Magnetic field effects were added to the governing equations of magnetic nanofluid flow in AnsysFluent software by writing codes in C++ language. According to the obtained results, the value of the Nusselt number increased by 72% with the increase of the Reynolds number, and with the application of a magnetic field, the value of the Nusselt number increased by 48.63% compared to the state without a magnetic field. The application of the magnetic field caused the formation of a pair of vortices in the magnetic nanofluid, which caused the penetration of the cool boundary layer in the central parts of the duct.The The flow of magnetic nanofluid in a three-way duct under varying magnetic fields has been investigated numerically using the mixed single-phase model. This research aimed to increase heat transfer by applying a magnetic field in a tee duct. In this conduit, the outer surface of the diagonal part was insulated and did not conduct any heat transfer with the outside space. The smooth part was at a constant temperature and with a temperature lower than the temperature of the magnetic nanofluid, and the magnetic field was inserted perpendicular to the channel. Water was considered as the base fluid and 4% iron oxide nanoparticles ( ) were added to it. The change of parameters such as the dimensionless number of the magnetic field intensity and the dimensionless Reynolds number on heat transfer were investigated. Magnetic field effects were added to the governing equations of magnetic nanofluid flow in AnsysFluent software by writing codes in C++ language. According to the obtained results, the value of the Nusselt number increased by 72% with the increase of the Reynolds number, and with the application of a magnetic field, the value of the Nusselt number increased by 48.63% compared to the state without a magnetic field. The application of the magnetic field caused the formation of a pair of vortices in the magnetic nanofluid, which caused the penetration of the cool boundary layer in the central parts of the duct.

کلیدواژه‌ها English

Magnetic Nanofluid
Ferrofluid
Tee Channel
Variable Magnetic Field
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دوره 21، شماره 1 - شماره پیاپی 66
فنی و مهندسی
بهار 1403
صفحه 453-481

  • تاریخ دریافت 28 شهریور 1402
  • تاریخ بازنگری 30 آذر 1402
  • تاریخ پذیرش 13 دی 1402