Natural Convection in a Non-Uniformly Heated Vertical Annular Cavity

Sankar, M.; Kiran, S.; Ramesh, G.; Makinde, Oluwole Daniel

doi:10.4028/www.scientific.net/ddf.377.189

Cited by 23 publications

(15 citation statements)

References 11 publications

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“…Natural convection in porous media has applications in some engineering problems such as in cooling of MEMs, solar collectors, geothermal applications, building insulation materials and many others. Industrial application examples are given in [ 1 , 2 , 3 , 4 ]. In some industrial applications such as MEMs, coolers of nuclear reactors and many other magnetic field effects may be relevant [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

MHD Free Convection and Entropy Generation in a Corrugated Cavity Filled with a Porous Medium Saturated with Nanofluids

Chamkha

Selimefendigil

2018

Entropy

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MHD free convection inside a triangular-wave-shaped corrugated porous cavity with Cu-water nanofluid is numerically studied with the finite element method. The influences of the Grashof number ( 10 4 ≤ Gr ≤ 10 6 ), Hartmann number ( 0 ≤ Ha ≤ 50 ), Darcy number ( 10 − 4 ≤ Da ≤ 10 − 1 ) and solid volume fraction of the nanoparticle ( 0 ≤ ϕ ≤ 0.05 ) on the convective flow features are examined. It is observed that increasing the Grashof number and Darcy number enhances the heat transfer, while the effect is opposite for the Hartmann number. As the corrugation frequency of the triangular wave increases, the local and averaged heat transfer rates decrease, which is more effective for higher values of Grashof and Darcy numbers. Normalized total entropy generation increases as the Darcy number and solid volume fraction of the nanoparticles increase and decreases as the Hartmann number increases both for flat and corrugated wall configurations.

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Section: Introductionmentioning

confidence: 99%

MHD Free Convection and Entropy Generation in a Corrugated Cavity Filled with a Porous Medium Saturated with Nanofluids

Chamkha

Selimefendigil

2018

Entropy

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“…The Ri number was an important studied parameter. Other previous studies 11‐16 on convection over confined object entrenched in a square cavity have shown that the flow structure and thermal characteristics may depend on various factors such as the position of entry and exit ports, the induced velocity of buoyancy force, the position and number of obstacle cylinders, and fluid proprieties. Selimefendigil and Chamkha 17 investigated in three‐dimensional simulation the mixed convection of a nanofluid in a vented enclosure.…”

Section: Introductionmentioning

confidence: 98%

Computational study of thermal buoyancy from two confined cylinders within a square enclosure wifth single inlet and outlet ports

Laidoudi

Makinde

2020

Heat Trans

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This article is devoted to investigating the mixed convection arising from two equally hot circular cylinders embedded in a square cavity of adiabatic surfaces. This cavity is filled with an incompressible fluid and contains single entry and outlet orifices. The heated cylinders are assumed to be arranged side‐by‐side with a fixed gap within the square cavity. Based on some simplifying assumptions, the nonlinear governing equations that express the principle of conservation of mass, momentum, and energy are obtained and numerically solved using a Computational fluid dynamics package ANSYS‐CFX with finite volume technique. Pertinent results showing the roles of embedded parameters such as Richardson number (Ri = 0 to 1) and Reynolds number (Re = 1 to 40) at Prandtl number (Pr = 1) on the overall fluid flow and temperature patterns are graphically depicted in the form of representative streamlines and isotherms. The values of average Nusselt number and total drag coefficient (CD) for both representative cylinders are also computed and discussed. Generally, an increase in buoyancy force augments the effectiveness of heat transfer only of the down cylinder. Also, a rise in Re and/or Ri numbers augment the flow instability.

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“…The enhancement of heat transfer has been the objective of many research articles in different applications such as discharge lamps [1][2][3][4][5][6][7][8][9][10][11]. In the same research area, many studies have been established to examine the natural convection heat transfer inside a porous medium due to the importance of this scientific research in many engineering applications, such as in solar collectors, the cooling of micro-electromechanical systems (MEMS) and various industrial applications, as reported by Pop and Ingham [12], Bejan et al [13], Vafai [14], Sankar et al [15] and Ben Hamida et al [16]. Chamkha and Selimefendigil [17] examined the generation of entropy and the natural convection inside a square corrugated cavity filled with porous medium saturated with nanofluid under the magnetic field effect.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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In this paper, a 2D numerical study of natural convection heat transfer in a W-shaped inclined enclosure with a variable aspect ratio was performed. The enclosure contained a porous medium saturated with Ag/Al2O3 hybrid nanofluid in the presence of uniform heat generation or absorption under the effect of a uniform magnetic field. The vertical walls of the enclosure were heated differentially; however, the top and bottom walls were kept insulated. The governing equations were solved with numerical simulation software COMSOL Multiphysics which is based on the finite element method. The results showed that the convection heat transfer was improved with the increase of the aspect ratio; the average Nusselt number reached a maximum for an aspect ratio (AR) = 0.7 and the effect of the inclination was practically negligible for an aspect ratio of AR = 0.7. The maximum heat transfer performance was obtained for an inclination of ω = 15 and the minimum is obtained for ω = 30 . The addition of composite nanoparticles ameliorated the convection heat transfer performance. This effect was proportional to the increase of Rayleigh and Darcy numbers, the aspect ratio and the fraction of Ag in the volumetric fraction of nanoparticles.

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Natural Convection in a Non-Uniformly Heated Vertical Annular Cavity

Cited by 23 publications

References 11 publications

MHD Free Convection and Entropy Generation in a Corrugated Cavity Filled with a Porous Medium Saturated with Nanofluids

MHD Free Convection and Entropy Generation in a Corrugated Cavity Filled with a Porous Medium Saturated with Nanofluids

Computational study of thermal buoyancy from two confined cylinders within a square enclosure wifth single inlet and outlet ports

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

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