Regular Article

Magnetic field impact on nanofluid convective flow in a vented trapezoidal cavity using Buongiorno's mathematical model^★

¹ Laboratory of Transport Phenomena, Faculty of Mechanical and Process Engineering, USTHB, B.P. 32, El-Alia Bab-Ezzouar, 16111 Algiers, Algeria
² Sonatrach − Direction Centrale Recherche et Développement, Avenue du 1er novembre, Boumerdes 35000, Algeria
³ Université de Lorraine, LERMAB, IUT Longwy, 54400 Cosnes et Romain, France

^* e-mails: mehdi_benzema@yahoo.fr

Received: 19 August 2019
Received in final form: 26 October 2019
Accepted: 4 November 2019
Published online: 17 December 2019

Abstract

Numerical study for the effect of an external magnetic field on the mixed convection of Al₂O₃–water Newtonian nanofluid in a right-angle vented trapezoidal cavity was performed using the finite volume method. The non-homogeneous Buongiorno model is applied for numerical description of the dynamic phenomena inside the cavity. The nanofluid, with low temperature and high concentration, enters the cavity through the upper open border, and is evacuated through opening placed at the right end of the bottom wall. The cavity is heated from the inclined wall, while the remainder walls are adiabatic and impermeable to both the base fluid and nanoparticles. After validation of the model, the analysis was carried out for a wide range of Hartmann number (0 ≼ Ha ≼ 100) and nanoparticles volume fraction (0 ≼ ϕ₀ ≼ 0.06). The flow behavior as well as the temperature and nanoparticles distribution shows a particular sensitivity to the variations of both the Hartmann number and the nanofluid concentration. The domination of conduction mechanism at high Hartmann numbers reflects the significant effect of Brownian diffusion which tends to uniform the distribution of nanoparticles in the domain. The average Nusselt number which increases with the nanoparticles addition, depends strongly on the Hartmann number. Finally, a correlation predicting the average Nusselt number within such geometry as a function of the considered parameters is proposed.