Entropy generation analysis during MHD natural convection flow of hybrid nanofluid in a square cavity containing a corrugated conducting block

Abstract

Purpose The purpose of this paper is to study the influence of magnetic field on entropy generation and natural convection inside an enclosure filled with a hybrid nanofluid and having a conducting wavy solid block. Also, the effect of fluid–solid thermal conductivity ratio is investigated. Design/methodology/approach The governing equations that are formulated in the dimensionless form are discretized via finite volume method. The velocity–pressure coupling is assured by the SIMPLE algorithm. Heat transfer balance is used to verify the convergence. The validation of the numerical results was performed by comparing qualitatively and quantitatively the results with previously published investigations. Findings The results indicate that the magnetic field and the conductivity ratio of the wavy solid block can significantly affect the dynamic and thermal field and, consequently, the heat transfer rate and entropy generation because of heat transfer, fluid friction and magnetic force. Originality/value To the best of the authors’ knowledge, the present numerical study is the first attempt to use hybrid nanofluid for studying the entropy generation because of magnetohydrodynamic natural convective flow in a square cavity with the presence of a wavy circular conductive cylinder. Irreversibilities due to magnetic effect are taken into account. The effect of fluid–solid thermal conductivity ratio is considered.

MHD rotating flow of a Maxwell fluid with Arrhenius activation energy and non‐Fourier heat flux model

“…Ibrahim and Tulu 24 researched the MHD flow of a nanofluid with heat transfer treatment embedded in porous media. Recently, many researchers 25–39 have investigated with or without MHD effects on nanoparticles.…”

Improvement of Free Convection Heat Transfer in a Concentric Cylindrical Annulus Heat Exchanger Using Nanofluid

“…These works are carried out for a Rayleigh number Ra=47000 and a radii ratio C=R2/R1=2. 6. We observe that, for the four results, the change in temperature is comparable.…”

“…The references of these studies can be classified according to their character: experimental [1][2][3], theoretical [4,5] or numerical [3,. In this last case, solutions are in the steady or unsteady state [32][33][34] and the space is twodimensional [6][7][8][9][10][11][12][13][14][15][16][17][18][19][23][24][25][26][27][28][29][30][31][32][33][34] or tridimensional [20][21][22]25]. The enclosures have various geometries, rectangular or cubical [6-21, 32, 34], cylindrical [33], spherical [22] or also in the form of cylindrical annulus [23][24][25][26] and elliptical [27][28]…”

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

“…The phase change model could be involved with natural convection effects in the molten region, as discussed in [ 17 , 18 ]. Various aspects of natural convection heat transfer in enclosures have been investigated such as Magnetohydrodynamic effects [ 19 , 20 ], entropy generation [ 21 , 22 ], and nanofluids [ 23 ]. Despite some degree of natural convection heat transfer, which could improve the melting heat transfer in thermal energy storage containers, the low heat transfer performance of PCMs is a barrier for quick charging and discharging processes.…”