View in EDS

Modeling the Natural Convection Flow in a Square Porous Enclosure Filled with a Micropolar Nanofluid under Magnetohydrodynamic Conditions

Saved in:
Bibliographic Details
Title: Modeling the Natural Convection Flow in a Square Porous Enclosure Filled with a Micropolar Nanofluid under Magnetohydrodynamic Conditions
Authors: Nikolaos P. Karagiannakis, George C. Bourantas, Eugene D. Skouras, Vassilios C. Loukopoulos, Karol Miller, Vasilis N. Burganos
Source: Applied Sciences, Vol 10, Iss 5, p 1633 (2020)
Publisher Information: MDPI AG
Publication Year: 2020
Collection: Directory of Open Access Journals: DOAJ Articles
Subject Terms: meshfree point collocation method, magnetohydrodynamics, micropolar, nanofluids, natural convection, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Description: The laminar, natural convective flow of a micropolar nanofluid in the presence of a magnetic field in a square porous enclosure was studied. The micropolar nanofluid is considered to be an electrically conductive fluid. The governing equations of the flow problem are the conservation of mass, energy, and linear momentum, as well as the angular momentum and the induction equations. In the proposed model, the Darcy−Brinkman momentum equations with buoyancy and advective inertia are used. Experimentally obtained forms of the dynamic viscosity, the thermal conductivity, and the electric conductivity are employed. A meshless point collocation method has been applied to numerically solve the flow and transport equations in their vorticity-stream function formulation. The effects of characteristic dimensionless parameters, such as the Rayleigh and Hartmann numbers, for a range of porosity and solid volume fraction of Al 2 O 3 particles in a water-based micropolar nanofluid on the flow and heat transfer in the cavity are investigated. The results indicate that the intensity of the magnetic field significantly affects both the flow and the temperature distributions. Moreover, the addition of nanoparticles deteriorates the heat-transfer efficiency under specific conditions.
Document Type: article in journal/newspaper
Language: English
Relation: https://www.mdpi.com/2076-3417/10/5/1633; https://doaj.org/toc/2076-3417; https://doaj.org/article/9644bb4b685849f5ae027979a2546a5c
DOI: 10.3390/app10051633
Availability: https://doi.org/10.3390/app10051633
https://doaj.org/article/9644bb4b685849f5ae027979a2546a5c
Accession Number: edsbas.F245AA3
Database: BASE
Description
Abstract:The laminar, natural convective flow of a micropolar nanofluid in the presence of a magnetic field in a square porous enclosure was studied. The micropolar nanofluid is considered to be an electrically conductive fluid. The governing equations of the flow problem are the conservation of mass, energy, and linear momentum, as well as the angular momentum and the induction equations. In the proposed model, the Darcy−Brinkman momentum equations with buoyancy and advective inertia are used. Experimentally obtained forms of the dynamic viscosity, the thermal conductivity, and the electric conductivity are employed. A meshless point collocation method has been applied to numerically solve the flow and transport equations in their vorticity-stream function formulation. The effects of characteristic dimensionless parameters, such as the Rayleigh and Hartmann numbers, for a range of porosity and solid volume fraction of Al 2 O 3 particles in a water-based micropolar nanofluid on the flow and heat transfer in the cavity are investigated. The results indicate that the intensity of the magnetic field significantly affects both the flow and the temperature distributions. Moreover, the addition of nanoparticles deteriorates the heat-transfer efficiency under specific conditions.
DOI:10.3390/app10051633