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Open AccessArticle

Magnetic Field Effect on the Double Diffusive Natural Convection in Three-Dimensional Cavity Filled with Micropolar Nanofluid

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Physics Department, College of Sciences Abha, King Khalid University, Abha 61421, Saudi Arabia
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Research Unit of Metrology and Energy Systems, National Engineering School, Energy Engineering Department, Monastir University, Monastir City 5000, Tunisia
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Mathematics Department, College of Science Abha, King Khalid University, Abha 61421, Saudi Arabia
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Mechanical Engineering Department, College of Engineering Abha, King Khalid University, Abha 61421, Saudi Arabia
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Energetic Laboratory of Thermal and Mass Transfers (LETTM), Faculty of Science Tunis, El Manar University, Tunis 2092, Tunisia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2342; https://doi.org/10.3390/app8122342
Received: 15 September 2018 / Revised: 11 November 2018 / Accepted: 15 November 2018 / Published: 22 November 2018
(This article belongs to the Special Issue Nanofluids and Their Applications)
This article presents a three-dimensional numerical investigation of heat and mass transfers and fluid flow in a cavity filled with an Al2O3/water micropolar fluid under uniform magnetic field. To solve the governing non-dimensional equations, Finite Volume Method (FVM) based on 3-D vorticity-vector potential formulation has been employed. The effects of various parameters such as buoyancy ratio (−2 ≤ N ≤ 0), Rayleigh number (103 ≤ Ra ≤ 105), Hartmann number (0≤ Ha≤ 60), nanoparticles volume fraction (0 ≤ φ ≤ 0.06) and micropolar material parameter (0≤ K≤ 5) on flow structure and on heat and mass transfers are presented. The results illustrate that for the micropolar nanofluid model, both heat and mass transfer rates and three-dimensional character of the flow are smaller when compared with the pure nanofluid model. It is also observed that increase and decrease in heat and mass transfer rates is experienced due to increase in Rayleigh number and Hartmann number, respectively. It is also noted that increase in vortex viscosity parameter reduces the average heat and mass transfer rates and is more evident when the magnetic field is imposed. Combined effects of magnetic field and nanoparticles volume fraction on heat and mass transfers are also explored. View Full-Text
Keywords: magnetic field; double-diffusion; natural convection; three-dimensional cavity; micropolar nanofluid magnetic field; double-diffusion; natural convection; three-dimensional cavity; micropolar nanofluid
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MDPI and ACS Style

Abidi, A.; Raizah, Z.; Madiouli, J. Magnetic Field Effect on the Double Diffusive Natural Convection in Three-Dimensional Cavity Filled with Micropolar Nanofluid. Appl. Sci. 2018, 8, 2342.

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