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Transactions of FAMENA, Vol. 46 No. 3, 2022.

Original scientific paper

https://doi.org/10.21278/TOF.463036021

Electro-Magnetoconvection of Conductive Immiscible Pure Fluid and Nanofluid

Jelena Petrović orcid id orcid.org/0000-0001-6768-9779 ; Faculty of Mechanical Engineering, Niš, Serbia
Živojin Stamenković ; Faculty of Mechanical Engineering, Niš, Serbia
Jasmina Bogdanović-Jovanović ; Faculty of Mechanical Engineering, Niš, Serbia
Milica Nikodijević orcid id orcid.org/0000-0002-6031-1666 ; Faculty of Occupational Safety, Niš, Serbia
Miloš Kocić orcid id orcid.org/0000-0002-6216-5113 ; Faculty of Mechanical Engineering, Niš, Serbia
Dragiša Nikodijević ; Faculty of Mechanical Engineering, Niš, Serbia

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Abstract

This paper discusses the magnetohydrodynamic flow and heat transfer in a horizontal channel whose top and bottom halves have different or the same permeability. The top half of the channel is saturated with oil and the bottom half with a water-based nanofluid. The channel is under the influence of an external homogeneous vertical magnetic field and an external homogeneous electric field perpendicular to the vertical longitudinal plane of the channel. The Darcy model is used to determine the fluid flow and heat transfer. Expressions for velocity and temperature distributions are defined and presented graphically for different values of the dimensionless parameters. The Nusselt numbers are determined and given in a table. The paper also investigates the influence of the Hartmann number, the porosity factor, the electrical load factor and the volume fraction of the nanofluid on velocity and temperature distributions in the channel as well as the Nusselt numbers. It has been shown that an increase in the volume fraction of nanoparticles leads to a decrease in the temperature in the channel. Increasing the porosity factor reduces the fluid velocity in the channel and increases the temperature. The Hartmann number increases the temperature in the channel. Higher absolute values of the load factor correspond to higher temperatures. By changing the value of this factor, the direction of fluid flow can also be changed.

Keywords

nanofluid; magnetic field; electric field; porous medium; heat transfer

Hrčak ID:

283760

URI

https://hrcak.srce.hr/283760

Publication date:

20.10.2022.

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