MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model

Abstract The problem of steady, laminar natural convection in a discretely heated and cooled square cavity filled by an alumina/water nanofluid with a centered heat-conducting solid block under the effects of inclined uniform magnetic field, Brownian diffusion and thermophoresis is studied numerical...

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Autores principales:	A. I. Alsabery, M. A. Sheremet, A. J. Chamkha, I. Hashim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cc74863aff87440dab8bca95f07d843f
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spelling	oai:doaj.org-article:cc74863aff87440dab8bca95f07d843f2021-12-02T15:05:02ZMHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model10.1038/s41598-018-25749-22045-2322https://doaj.org/article/cc74863aff87440dab8bca95f07d843f2018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25749-2https://doaj.org/toc/2045-2322Abstract The problem of steady, laminar natural convection in a discretely heated and cooled square cavity filled by an alumina/water nanofluid with a centered heat-conducting solid block under the effects of inclined uniform magnetic field, Brownian diffusion and thermophoresis is studied numerically by using the finite difference method. Isothermal heaters and coolers are placed along the vertical walls and the bottom horizontal wall, while the upper horizontal wall is kept adiabatic. Water-based nanofluids with alumina nanoparticles are chosen for investigation. The governing parameters of this study are the Rayleigh number (103 ≤ Ra ≤ 106), the Hartmann number (0 ≤ Ha ≤ 50), thermal conductivity ratio (0.28 ≤ k w ≤ 16), centered solid block size (0.1 ≤ D ≤ 0.7) and the nanoparticles volume fraction (0 ≤ ϕ ≤ 0.04). The developed computational code is validated comprehensively using the grid independency test and numerical and experimental data of other authors. The obtained results reveal that the effects of the thermal conductivity ratio, centered solid block size and the nanoparticles volume fraction are non-linear for the heat transfer rate. Therefore, it is possible to find optimal parameters for the heat transfer enhancement in dependence on the considered system. Moreover, high values of the Rayleigh number and nanoparticles volume fraction characterize homogeneous distributions of nanoparticles inside the cavity. High concentration of nanoparticles can be found near the centered solid block where thermal plumes from the local heaters interact.A. I. AlsaberyM. A. SheremetA. J. ChamkhaI. HashimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-23 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. I. Alsabery M. A. Sheremet A. J. Chamkha I. Hashim MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
description	Abstract The problem of steady, laminar natural convection in a discretely heated and cooled square cavity filled by an alumina/water nanofluid with a centered heat-conducting solid block under the effects of inclined uniform magnetic field, Brownian diffusion and thermophoresis is studied numerically by using the finite difference method. Isothermal heaters and coolers are placed along the vertical walls and the bottom horizontal wall, while the upper horizontal wall is kept adiabatic. Water-based nanofluids with alumina nanoparticles are chosen for investigation. The governing parameters of this study are the Rayleigh number (103 ≤ Ra ≤ 106), the Hartmann number (0 ≤ Ha ≤ 50), thermal conductivity ratio (0.28 ≤ k w ≤ 16), centered solid block size (0.1 ≤ D ≤ 0.7) and the nanoparticles volume fraction (0 ≤ ϕ ≤ 0.04). The developed computational code is validated comprehensively using the grid independency test and numerical and experimental data of other authors. The obtained results reveal that the effects of the thermal conductivity ratio, centered solid block size and the nanoparticles volume fraction are non-linear for the heat transfer rate. Therefore, it is possible to find optimal parameters for the heat transfer enhancement in dependence on the considered system. Moreover, high values of the Rayleigh number and nanoparticles volume fraction characterize homogeneous distributions of nanoparticles inside the cavity. High concentration of nanoparticles can be found near the centered solid block where thermal plumes from the local heaters interact.
format	article
author	A. I. Alsabery M. A. Sheremet A. J. Chamkha I. Hashim
author_facet	A. I. Alsabery M. A. Sheremet A. J. Chamkha I. Hashim
author_sort	A. I. Alsabery
title	MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
title_short	MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
title_full	MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
title_fullStr	MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
title_full_unstemmed	MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
title_sort	mhd convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/cc74863aff87440dab8bca95f07d843f
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MHD convective heat transfer in a discretely heated square cavity with conductive inner block using two-phase nanofluid model

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