Numerical Study of Natural Convection of Nanofluid in a Square Enclosure in the Presence of the Magnetic Field
Youness El Hammami1, Mohamed El Hattab2, Rachid Mir3, Touria Mediouni4
1Youness El Hammami, Mechanics, Process of Energy and Environment Laboratory, ENSA, Ibn Zohr University, Morocco.
2Mohamed El Hattab, Mechanics, Process of Energy and Environment Laboratory, ENSA, Ibn Zohr University, Morocco.
3Rachid Mir, Mechanics, Process of Energy and Environment Laboratory, ENSA, Ibn Zohr University, Morocco.
4Touria Mediouni, Mechanics, Process of Energy and Environment Laboratory, ENSA, Ibn Zohr University, Morocco.
Manuscript received on 15 April 2015 | Revised Manuscript received on 25 April 2015 | Manuscript Published on 30 April 2015 | PP: 230-239 | Volume-4 Issue-4, April 2015 | Retrieval Number: D3971044415/15©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: .This article reports a numerical study on natural convection in an enclosure that is filled with a water–Cu nanofluid and is influenced by a magnetic field. Side walls are the heated surfaces (hot and cold walls). Top and bottom walls of the cavity are assumed to be adiabatic. Theoretical models of Maxwell–Garnetts (MG) and Brinkman are employed to predict the thermal conductivity and viscosity of the nanofluid respectively. The transport equations for continuity, momentum and energy are solved with finite volume approach using the SIMPLE algorithm. This study is carried out to predict the effect of Rayleigh number, Hartmann number and the solid volume fraction of nanoparticles on the flow and heat transfer rate. Results show, There is an opposite effect of Ra and Ha on flow regime, by increasing the magnetic force (higher Hartmann number), the conduction heat transfer becomes the dominate mechanism in heat transfer; this increment causes thermal dissipation in the flow of nanofluid to be enhanced. When the Rayleigh number is high and the Hartmann number is low, the streamlines and isotherms are distributed strongly in the enclosure domain and the heat is transferred due to convection.
Keywords: Copper-Water Nanofluid; Magnetic Field; Heat Transfer; Natural Convection; Numerical Study
Scope of the Article: Heat Transfer