نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی مکانیک، واحد علی آباد کتول، دانشگاه آزاد اسلامی، علی آباد کتول، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
One of the most widely used subjects in mechanical engineering science is the investigation of the flow and natural convection heat transfer in enclosures. The main purpose of this paper is to investigate an angled external magnetic field on fluid flow characteristics, natural convection heat transfer and entropy production in a cavity - an enclosed space between a square and cylindrical channel - which is filled with water-aluminum oxide (Al2O3) nanofluid. To achieve this goal, first the governing equations of the problem - conservation of mass, momentum and energy - are written in dimensionless form and then they are solved numerically using the finite element-based control volume method (CVFEM). The effect of important dimensionless parameters such as Rayleigh number, Hartmann number, magnetic field angle, amount and shape of nanoparticles and aspect ratio on flow and temperature fields, average Nusselt number and entropy production number are investigated. The results show that when the Rayleigh number increases from 103 to 105, the value of the average Nusselt number increases by 44.7% and the value of the entropy generation number increases by about 5.4 times. For Rayleigh 105, when the Hartmann number increases from zero to 20, the average Nusselt number and entropy generation number decrease by 9.2% and 6%, respectively. In Hartmann 20, when the nanoparticle shape changes from a spherical cube to a platelet, the average Nusselt number and the entropy generation number increase by 7.6% and 4.1%, respectively
کلیدواژهها [English]
)