Impact of wall electrical conductivity on heat transfer enhancement in MHD hybrid nanofluid flow within an annulus
Authors: Ali Bendjaghlouli, Brahim Mahfoud, Hibet Errahmane Mahfoud
Volume 11, Issue 2, Paper No. 110204
AbstractÂ
A numerical investigation was conducted to explore the influence of magnetic field and the electric conductivity of container walls on the swirling flow of a hybrid nanofluid. In this study, a stationary inner wall and a rotating outer wall with a fixed Ω were considered within the annular between coaxial cylinders. Radial application of a magnetic field was utilized to assess its impact on the average Nusselt number. The mathematical model, formulated by differential equations, was solved using the finite volume method. The study examined the variations in azimuthal velocity, temperature, and Nusselt number with increasing magnetic intensity. Therefore, it can be concluded that the control of heat transfer efficiency increasingly relies on the combined influence of magnetic field intensity and the electrical conductivity of walls. The findings revealed that higher magnetic Hartmann numbers led to elevated temperature distribution and azimuthal velocity within the annulus center. Moreover, electromagnetic damping exhibited a more pronounced impact on heat transfer when all walls were electrically conductive, resulting in a 90% improvement in heat transfer with the hybrid nanofluid.
Keywords: Coaxial cylinders, heat transfer, hybrid nanofluid, magnetic field, swirling flow
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