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Improvement of Energy, Exergy Efficiency and PEC Index in a Heat Exchanger Equipped with Turbulators under the Effect of a Magnetic Field | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 13، شماره 2 - شماره پیاپی 26، شهریور 2026، صفحه 193-206 اصل مقاله (1.87 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2025.36432.1672 | ||
| نویسندگان | ||
| Alireza Aghaei* ؛ Alireza Mirzaei؛ Abolfazl Fattahi | ||
| Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran | ||
| تاریخ دریافت: 15 دی 1403، تاریخ بازنگری: 16 فروردین 1404، تاریخ پذیرش: 30 تیر 1404 | ||
| چکیده | ||
| A double-tube heat exchanger equipped with vortex generators is simulated under the influence of a magnetic field. The internal tube of this heat exchanger is equipped with blade-type vortex generators with various geometrical shapes. A magnetic field is employed to enhance thermal efficiency in the double-tube heat exchanger, with Hartmann numbers ranging from 35 to 155. The applied hybrid nanofluid is composed of Syltherm 800, iron oxide, and graphene oxide at volume fractions (φ) of 0, 1.75, and 3.75%. The study is conducted under steady-state conditions using a two-phase model with Reynolds number ranging from 25,000 to 55,000, utilizing the k-epsilon turbulence model. The results indicate that as the Re increases, the convective heat transfer coefficient rises. The maximum increase in the Nusselt number is observed in the heat exchanger equipped with vortex generators of Sample 3, whereas the minimum value occurs in the bare heat exchanger. Additionally, as the Hartmann number increases from 35 to 155, the exergy efficiency also rises. Exergy efficiency increases with Reynolds number up to 35,000 and then decreases. It is also found that the application of a magnetic field maximizes the exergy efficiency at a Re of 35,000 and Hartmann number of 155 for the heat exchanger equipped with Sample 3 vortex generators. | ||
| کلیدواژهها | ||
| Double-tube heat exchanger؛ vortex generator؛ Two-phase flow؛ Magnetic field, hybrid nanofluid؛ Exergy efficiency | ||
| عنوان مقاله [English] | ||
| بهبود بازده انرژی و اگزرژی و شاخص PEC در یک مبدل گرمایی مجهز شده به توربولاتور تحت تاثیر میدان مغناطیسی | ||
| چکیده [English] | ||
| مبدل حرارتی دو لوله ای یا همان مبدل حرارتی تک لوله ای از نظر نوع جریان به دو دسته جریان ناهمسو (جریان مخالف) و جریان همسو (موافق) تقسیم می شود. در نوع جریان ناهمسو سیالات جاری در خلاف جهت یکدیگر حرکت می کنند و نسبت به نوع جریان همسو که هر دو سیال در یک جهت حرکت می کنند، تبادل حرارتی بیشتری صورت می گیرد. مبدل حرارتی دولولهای مجهز به ورتکس ژنراتور تحت تاثیر میدان مغناطیسی در مطالعه حاضر به صورت سه بعدی شبیهسازی میگردد. لوله داخلی این مبدل حرارتی مجهز به ورتکس ژنراتورهای پرهای میباشد. هندسه ورتکس ژنراتورها در حالتهای مختلف هندسی مورد مدلسازی قرار گرفته و تاثیر آن بر عملکرد هیدرولیکی-حرارتی و بازده اگزرژی مورد بررسی قرار میگیرد. در این مسئله از میدان مغناطیسی با هدف بالا بردن راندمان حرارتی در مبدل حرارتی دولولهای استفاده شده است. میدان مغناطیسی در اعداد هارتمن 35 تا 155 مورد بررسی قرار میگیرد. همچنین نانوسیال هیبریدی سیلترم 800/اکسید آهن-اکسید گرافن در کسرحجمی صفر، 1.75 و 3.75 درصد به عنوان سیال کاری مورد استفاده قرار میگیرد. مطالعه به صورت پایا و در رژیم جریان آشفته در محدوده اعداد رینولدز 25000 تا 55000 و با استفاده از مدل توربولانسی کا-اپسیلون انجام میشود. علاوه بر این به منظور کوپل معادلات سرعت و فشار از الگوریتم سیمپل سی استفاده میشود. نتایج به دست آمده نشان میدهد با افزایش عدد رینولدز، ضریب انتقال حرارت جابهجایی افزایش پیدا کرده و در نتیجه انتقال حرارت زیاد میشود. در واقع با افزایش عدد رینولدز سرعت جریان نانوسیال هیبریدی زیاد شده و در نتیجه عدد ناسلت متوسط افزایش مییابد. حداکثر افزایش تغییرات عدد ناسلت درمبدل حرارتی مجهز به ورتکس ژنراتور با شکل هندسی Sample 3 و حداقل تغییرات مربوط به زمانی است که مبدل حرارتی خالی و بدون ورتکس ژنراتور میباشد.در کسرحجمی 3.75 درصد و عدد رینولدز 55000، افزودن ورتکس ژنراتور (حالت هندسی Sample 3) درون مبدل حرارتی دولولهای باعث میشود عدد ناسلت متوسط به میزان 60.18 درصد نسبت به زمانی که درون مبدل حرارتی دولولهای بدون ورتکس ژنراتور است، افزایش یابد. همچنین با افزایش عدد هارتمن از 35 تا 155، بازده اگزرژی افزایش پیدا میکند. همچنین با افزایش عدد رینولدز تا 35000 بازده اگزرژی افزایش و سپس کاهش پیدا میکند. در واقع میتوان نتیجه گرفت که استفاده از میدان مغناطیسی حداکثر بازده اگزرژی را در عدد رینولدز 35000 و عدد هارتمن 155 درون مبدل حرارتی دولولهای مجهز به ورتکس ژنراتور با حالت هندسی Sample 3 دارد | ||
| کلیدواژهها [English] | ||
| مبدل حرارتی دولولهای, ورتکس ژنراتور, جریان دوفازی, میدان مغناطیسی, نانوسیال هیبریدی, بازده اگزرژی | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 623 تعداد دریافت فایل اصل مقاله: 9 |
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