Immersed boundary method for MHD unsteady natural convection around a hot elliptical cylinder in a cold rhombus enclosure filled with a nanofluid
| العنوان: | Immersed boundary method for MHD unsteady natural convection around a hot elliptical cylinder in a cold rhombus enclosure filled with a nanofluid |
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| المؤلفون: | Amir H. Roohi, Ali Akbar Hosseinjani |
| المصدر: | SN Applied Sciences. 3 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Natural convection, Materials science, General Chemical Engineering, 0211 other engineering and technologies, General Engineering, General Physics and Astronomy, 02 engineering and technology, Rayleigh number, Mechanics, Immersed boundary method, Hartmann number, 01 natural sciences, Nusselt number, 010406 physical chemistry, 0104 chemical sciences, Nanofluid, General Earth and Planetary Sciences, Cylinder, General Materials Science, Streamlines, streaklines, and pathlines, 021108 energy, General Environmental Science |
| الوصف: | In this study, the numerical investigation of the natural convection heat transfer around a hot elliptical cylinder inside a cold rhombus enclosure filled with a nanofluid in the presence of a uniform magnetic field is conducted. An immersed boundary method as a computational tool has been extended and applied to solve the problem. The influence of various parameters such as cylinder diameters (a, b), Hartmann number (Ha = 0, 50 and 100), nanofluid volume fraction ($$\varphi = 0 , 2.5\% and 5\%$$ φ = 0 , 2.5 % a n d 5 % ), and Rayleigh number (Ra = 103, 104, 105, 106, and 107) has been studied. Streamlines and isotherms contours as well as average Nusselt number have been specified for different modes. An equation for the average Nusselt number as a function of mentioned parameters is presented in this paper. The results show that at lower Ra numbers of Ra = 103 and 104, the magnetic field effect is negligible. However, at higher Rayleigh numbers, the average Nusselt number (Nuave) decreases with the increasing Ha number. The maximum decrease in Nuave at Ra = 105, 106 and 107are calculated −8.15%, −23.4% and −27.3%, respectively. An asymmetry-unsteady flow is observed at $${\text{Ra}} = 10^{7}$$ Ra = 10 7 for Ha = 0. However, at higher Ha numbers a steady-symmetrical flow is formed. |
| تدمد: | 2523-3971 2523-3963 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::8c5451b3218d87e590c8c398ef822fc1 https://doi.org/10.1007/s42452-021-04221-3 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........8c5451b3218d87e590c8c398ef822fc1 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 25233971 25233963 |
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