期刊
SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41598-021-03477-4
关键词
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资金
- Deanship of Scientific Research at King Khalid University [R.G.P.2/110/41]
- Deputyship for Research & Innovation, Ministry of Education, in Saudi Arabia [IFP-KKU-2020/10]
This article discusses the natural convection heat transfer of Ag/Al2O3-water hybrid in an enclosure with a rotating cylinder and an inner undulated porous layer under a uniform magnetic field. Various thermo-physical parameters are investigated, showing that an increase in Rayleigh number and Darcy number enhances heat transfer convection within the enclosure, while porosity has minimal impact. Rotation speed in a positive direction also has a favorable influence on heat transfer dispersion across the cavity.
The current article aims to discuss the natural convection heat transfer of Ag/Al2O3-water hybrid filled in an enclosure subjected to a uniform magnetic field and provided with a rotating cylinder and an inner undulated porous layer. The various thermo- physical parameters are investigated such as Rayleigh number (100 <= Ra <= 100000), Hartmann number (0 <= Ha <= 100), and the nanoparticles concentration (0.02 <= phi <= 0.08). Likewise, the rotational speed of the cylinder (- 4000 <= omega <= + 4000), as well as several characteristics related to the porous layer, are examined li its porosity (0.2 <= epsilon <= 0.8), Darcy number (- 100000 <= Da <= - 100) which indicates the porous medium permeability and the number of undulations (0 <= N <= 4). The calculations are carried out based on the Galerkin Finite element method (GFEM) to present the streamlines, isotherms, entropy generation, and average Nusselt numbers in details. The main results proved that increment of Rayleigh number and Darcy number enhances heat transfer convection within the enclosure. Whilst, the porosity presents a minimal impact. Also, the rotational speed in a positive direction has a favorable influence on the heat transfer dispersion across the cavity.
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