Numerical solution of heat transfer and flow of nanofluids in annulus with fins attached on the inner cylinder under the influence of magnetic field

Subject Areas : Nano

Ahad Abedini ^{1 *} , siamak zolfaghari ²

1 - استادیار، مرکز تحقیقات انرژی و توسعه پایدار، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران
2 - Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran

Received: 2023-09-24 Accepted : 2025-12-21 Published : 2026-01-09

Keywords: Magnetic field, Concentric cylinders, Natural convection, numerical study, Fin,

Abstract :

In the present study, the flow and heat transfer of free-moving nanofluid of water-aluminum oxide in two two-dimensional concentric cylinders when an external magnetic field is applied to the problem were numerically investigated. The flow is monitored slowly, steadily and symmetrically. All simulations are performed for Hartmann numbers from 0 to 30 and for Riley less than 105 and volume fraction (φ) 2%. The equations used are polar and are separated in two-dimensional mode by finite volume method. The simple algorithm is used to communicate the velocity and pressure terms, and all results are obtained with Fluent commercial software. Examination of the results shows that for geometry with an angle of 0 degrees in all different sizes of blades (S) 4 vortices are created symmetrically on both sides, which become thinner by increasing the length of the blade (S) in the blade throat. . Increasing the Hartmann number decreases the Nusselt number. Because they reduce the intensity of the vortices inside the cylinder.