Numerical analysis of flow and natural convection heat transfer in a circular enclosure heated from bottom utilizing porous layer

Document Type : Research Article

Authors

1 صنعتی ارومیه-مهندسی مکانیک

2 Department of Mechanical Engineeing, Iran University of Science and Technology, Tehran, Iran

Abstract

In the present paper, laminar flow and heat transfer of /water nanofluid in a circular enclosure have been numerically carried out using the Buongiorno’s model. A porous layer is attached to the hot wall of the enclosure and an applied uniform external magnetic field generates magnetohydrodynamic effect in the cavity. The simulations are performed utilizing a two-phase model and nano particle concentration distribution is presented. All of the equations are solved in dimensionless form. The control parameters in this study are Darcy number , angle of the applied magnetic field , Hartmann number , effective conductive heat transfer coefficient of the porous layer , Rayleigh number , geometrical parameters like porous layer thickness  , and central angle of the cavity . The gained results which are derived in form of plots, contours, and also streamlines show the dependency of Nusselt number to control parameters. According to the results, any changes in Darcy number cause Nusselt number variations, and also there is a specified Darcy number that heat transfer reduces by an increase of Darcy number. Moreover, by an increment of Hartmann number, leading to higher Lorentz force, the average Nusselt number will reduce because the momentum of fluid flow and consequently convective heat transfer decrease inside the enclosure.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3 (Special Issue)
June 2021
Pages 1937-1962

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