MHD thermogravitational convection and thermal radiation of a micropolar nanoliquid in a porous chamber M. Izadi, M. A. Sheremet, S. A. Mehryan [et al.]
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ArticleContent type: Текст Media type: электронный Subject(s): магнитное поле | наножидкости | локальное тепловое равновесие | термогравитационная конвекция | МГД-конвекцияGenre/Form: статьи в журналах Online resources: Click here to access online
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International communications in heat and mass transfer Vol. 110. P. 104409 (1-10)Abstract: This work studies the thermogravitational transmission and thermal radiation of micropolar nanoliquid within a
porous chamber in the presence of the uniform magnetic influence. The model includes the single-phase nanofluid
approach, local thermal equilibrium approximation and Darcy law for the processes within the porous
structure. The Galerkin finite element method with the structured non-uniform mesh is used to calculate the
formulated equations. The key characteristics are the Darcy–Rayleigh number Ra = 10–1000, Darcy number
Da = 10−5–10−1, porosity ε = 0.1–0.9, nanoparticles concentration φ = 0–0.04, radiation parameter
Rd=0–2, vortex viscosity characteristic Δ=0–2, and Hartmann number Ha=0–50. It has been ascertained the
energy transport intensification with thermal radiation parameter, Darcy–Rayleigh number, porosity and nanoparticles
concentration. Also, the results indicate that the average Nusselt number reduces with an increment
of the Hartmann number for high values of the Rayleigh number, while for low magnitudes of the Rayleigh
number a weak change of the average Nusselt number can be found.
Библиогр.: 77 назв.
This work studies the thermogravitational transmission and thermal radiation of micropolar nanoliquid within a
porous chamber in the presence of the uniform magnetic influence. The model includes the single-phase nanofluid
approach, local thermal equilibrium approximation and Darcy law for the processes within the porous
structure. The Galerkin finite element method with the structured non-uniform mesh is used to calculate the
formulated equations. The key characteristics are the Darcy–Rayleigh number Ra = 10–1000, Darcy number
Da = 10−5–10−1, porosity ε = 0.1–0.9, nanoparticles concentration φ = 0–0.04, radiation parameter
Rd=0–2, vortex viscosity characteristic Δ=0–2, and Hartmann number Ha=0–50. It has been ascertained the
energy transport intensification with thermal radiation parameter, Darcy–Rayleigh number, porosity and nanoparticles
concentration. Also, the results indicate that the average Nusselt number reduces with an increment
of the Hartmann number for high values of the Rayleigh number, while for low magnitudes of the Rayleigh
number a weak change of the average Nusselt number can be found.
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