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، تابستان 2026، صفحه 193-206 اصل مقاله (1.55 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 | ||
| 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 | ||
| مراجع | ||
|
| ||
|
آمار تعداد مشاهده مقاله: 801 تعداد دریافت فایل اصل مقاله: 236 |
||
| تعداد نشریات | 22 |
| تعداد شمارهها | 723 |
| تعداد مقالات | 10,402 |
| تعداد مشاهده مقاله | 72,894,922 |
| تعداد دریافت فایل اصل مقاله | 64,573,496 |