Impact of periodic magnetic source on natural convection and entropy generation of ferrofluids in a baffled cavity

Abstract

Purpose This paper aims to exhibit a numerical study to analyze the influence of a periodic magnetic source on free convection flow and entropy generation of a ferrofluid in a baffled cavity. In this study, ferrofluid nanofluid was selected due to its ability to image magnetic domain structures within the cavity. The non-uniform magnetic source is considered as a sinusoidal distribution in the vertical direction. Design/methodology/approach The finite volume technique is used to evaluate the steady two-dimensional partial differential equations that govern the flow with its corresponding boundary conditions. Findings The obtained results indicate that a significant increase in the average Nusselt number can be achieved with the use of the periodic magnetic source instead of a uniform case. In addition, the effectiveness of the adiabatic baffle notably depends on its position and Rayleigh number. Regardless of the values of period and Hartmann numbers, the periodic magnetic source has a higher entropy generation and lower Bejan number than the uniform magnetic source. Originality/value The novelty of this research lies in applying a periodic magnetic source on the natural convection of ferrofluids in a baffled cavity.

Kaviteye Yerleştirilen Açılı Kare Silindirden Doğal Ve Zorlanmış Taşınım

“…The average Nusselt number was enhanced as 56.03% with an optimum configuration. Additionally, magnetic field were also implied to improve heat transfer in cavities [16,21]. Time-varied flow at the inlet of the cavity was applied to enhance the heat transfer rates in the literature [22,23].…”

Preferred location of the porous sleeve in a concentric annulus depending on the thermal insulation

“…[6][7][8] Among the problems associated with free convection, numerous researchers have directed their research on thermal-hydrodynamic characteristics through differentially heated boundaries in different geometric cavities. [9][10][11][12] For example, Varol et al 13 tested free thermal convection flow in a porous media-filled triangular cavity having a conducting fin placed on the heated wall. Barman and Rao 9 examined buoyancy-driven flow of nanofluids in a wavy cavity loaded by porous material.…”