Natural convective heat transfer and entropy generation of alumina/water nanofluid in a tilted enclosure with an elliptic constant temperature: Applying magnetic field and radiation effects

Abstract

In this work, the free convection of Al2O3/water nano-fluid in a tilted enclosure is investigated. The enclosure is under a magnetic field. A curved shape fin is placed in the lower part of the enclosure. The fin is at a higher temperature of Th, and the right wall is cooled with the temperature of Tc. The top, bottom, and left walls are insulated. The SIMPLE algorithm is used to solve the equations governing the nano-fluid flow. Finally, the effects of magnetic field strength, the variations of Rayleigh number (Ra), radiation parameter, nanoparticles concentration, inclination angle (IA), and aspect ratio (AR) are studied on the heat transfer rate (HTR) and irreversibilities. The findings show that the HTR and the maximum entropy generation augment 2.69 and 3.77 times, respectively, by augmenting the Ra from 103 to 105. Also, increasing Ha number from 0 to 40 causes 38% and 66% reductions for the HTR and entropy generation, respectively. Considering the radiation mode of heat transfer causes an increase of HTR and entropy generation and a decline of thermal irreversibilities. The average Nusselt number and the entropy generation increase by 10% and 12%, respectively for the concentration of 6% while disregarding the radiation phenomena. The HTR and entropy generation rise with the AR.