Abstract
A numerical analysis was performed to study free convection in a stationary laminar regime in a partially heated cube filled with ionanofluid. To numerically solve the dimensionless equations, we applied the finite volume method using the SIMPLEC algorithm for pressure correction. All walls are adiabatic, except for the left and right side walls which are partially heated differently. At the end of this simulation, several results are given in the form of current lines, isotherms, and variations in the Nusselt number. These results are obtained by analyzing the effect of a set of factors such as Rayleigh number, particle volume fraction, cold and source position on the dynamic and thermal fields, and heat transfer. It has been shown that the percentage of nanoparticles and high Rayleigh numbers significantly increase heat transfer by ionanofluid. Two comparisons have been made, between ionic fluid and ionanofluid at isotherms and streamlines, and between nanofluid and ionanofluid at Nusselt number, which show the advantage of using ionanofluid in heat transfer.
Highlights
Introduction e low thermal conductivity of conventional fluids used in free convection has led physicists to replace them with another, that is, with a high thermal conductivity called nanofluid. is new fluid invented by Choi and Eastman [1] is a colloidal solution composed of nanoparticles suspended in a base fluid
Mehryan et al [6] numerically analyzed the free convection inside porous enclosures filled with water/Ag-MgO nanofluids with Darcy and LTNE conditions. e results indicate that the dissipation of MgO-Ag in the base fluid significantly reduces heat transfer. ey found that increasing the concentration of the nanoparticles significantly improves the heat transfer for the nanofluid CuO-water
Selimefendigil and Oztop proposed the use of nanofluid jets for cooling an isothermal surface under the influence of a rotating cylinder [18], which affects the fluid flow and heat transfer characteristics. e same researchers [19] used the same technique for cooling an isothermal surface in a partially porous medium under the impact of an inclined magnetic field. ey observed that the characteristics of the magnetic field and the porous medium have significant impacts on the variation of the flux and thermal patterns for the thermal configuration
Summary
Mehryan et al [6] numerically analyzed the free convection inside porous enclosures filled with water/Ag-MgO nanofluids with Darcy and LTNE conditions. Ey found that increasing the concentration of the nanoparticles significantly improves the heat transfer for the nanofluid CuO-water. Alsabery et al [16] studied free convection in a cavity with elastic walls; it was observed that the elastic walls affect the fluid flow and heat transfer characteristics. In the presence of a uniform magnetic field, a numerical study was carried out by Selimefendigil and Oztop [17] of the laminar flow of nanofluid on a corrugated plate. Zhou et al [21], using the Boltzmann method, have created a 3D model to analyze the heat transfer and flow dynamics of the mixed convection of the nanofluid water-Al2O3 in a cube in the existence of a magnetic field. The findings show that the external magnetic field applied has the effect of removing the convection state of heat transfer within the enclosure
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