Abstract
In this research work, we present a study of the magnetic field impact on the flow of AL2O3-water nanofluid which results from natural convection that occurs inside a cavity having a particular shape. For this study a monophasic model is used. As resolution of the different equations which describe the physical phenomenon to be studied is difficult, the use of Ansys-Fluent software appears essential to do this task. An analysis of the impacts of Rayleigh numbers (7.68.104, 1.5.105 and 3.072.105) and Hartmann numbers (0 to 75) as well as the concentration of nanoparticles expressed as a percentage (0 to 5%) on heat transmission and entropy production was performed. Numerical results obtained confirm that mean Nusselt number and entropy production vary proportionally with Rayleigh number and the particles concentration and they are inversely proportional to Hartmann number. Based on the results obtained, improvement in thermal performance depends on the nanoparticles concentration. Correlations for Nusselt number expressed as an equation of two variables which are Hartmann and concentration of the nanoparticles have been proposed to predict the rate of heat transmission inside the enclosure.
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