MHD natural convection and entropy analysis of a nanofluid inside T-shaped baffled enclosure

Abstract

Purpose The purpose of this paper is to numerically study MHD natural convection and entropy generation of Al2O3-water alumina nanofluid inside of T-shaped baffled cavity which is subjected to a magnetic field. Design/methodology/approach Effect of various geometrical, fluid and flow factors such as aspect ratio of enclosure and baffle length, Rayleigh and Hartmann number of nanofluid have been considered in detail. The hydrodynamics and thermal indexes of nanofluid have been described using streamlines, isotherms and isentropic lines. Findings It is found that by enhancing Hartmann number, symmetrical streamlines gradually lose symmetry and their values decline. It is found that by enhancing Hartmann number, symmetrical streamlines gradually lose symmetry and their values decline. The interesting finding is an increase in the impact of Hartmann number on heat transfer indexes with augmenting Rayleigh number. However, with augmenting Rayleigh number and, thus, strengthening the buoyant forces, the efficacy of Hartmann number one, an index indicating the simultaneous impact of natural heat transfer to entropy generation increases. It is clearly seen that the efficacy of nanofluid on increased Nusselt number enhances with increasing aspect ratio of the enclosure. Based on the results, the Nusselt number generally enhances with the larger baffle length in the enclosure. Finally, with larger Hartmann number and lesser Nusselt one, entropy production is reduced. Originality/value The authors believe that all the results, both numerical and asymptotic, are original and have not been published elsewhere.

MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al2O3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

“…They found that the promotion of the aspect ratio improved the circulation of dynamic flow and the Nusselt number; by contrast, an increase of the Hartmann number reduces these factors. In the same way, other studies, such as that by Armaghani et al [32], investigated the effect of the addition of a baffle to the T-shaped enclosure. They discovered that the addition of a baffle significantly enhanced the heat transfer performance inside the cavity.…”

Free Convection of Hybrid Nanofluids in a C-Shaped Chamber under Variable Heat Flux and Magnetic Field: Simulation, Sensitivity Analysis, and Artificial Neural Networks

“…host liquid (pure water) and nano-sized particles Fe 3 O 4 -MWCNT are in thermal equilibrium; -nanoliquid is an incompressible and Newtonian liquid; -the liquid circulation is considered to be stable and 2D; -thermal transmission is done by thermogravitational convection and the radiation influence is assumed negligible. -According to these assumptions mentioned in the physical modelling, three equations of fluid conservation, namely, conservation of mass, momentum conservation in the horizontal and vertical directions, and energy conservation are shown as follows [10,14,40]:…”

Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field

“…The effectiveness of fins has been confirmed in forced convection. However, due to reduced velocity in natural convection, the size and shape of the fin determine whether it improves or diminishes HTR, particularly in cavities [18][19][20][21][22][23][24]. Alnaqi et al [25] placed a fin of constant thermal conductivity in an inclined square cavity to investigate its effect on natural convection heat transfer.…”