Numerical investigation of mixed convection in an anchor-stirred tank filled with an Al2O3-water nanofluid

Mokhefi, Abderrahim; Bouanini, Mohamed; Elmir, Mohammed; Guettaf, Yacine; Spitéri, Pierre

doi:10.1007/s11696-021-01914-2

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…Given the importance of mixing in various industrial processes, numerous studies consisted of experimental design and computational studies to develop the effectiveness of hydro-dynamic compositions and the operating constraints. Several studies were reported in the mechanical agitation literature by many authors; Bertrand et al 1 , Rahmani et al 2 , Ameur et al [3][4][5] , Kamla 6,7 , Driss et al 8 , Mokhefi 9 , and Jaszczur et al 10 .…”

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confidence: 99%

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Benhanifia

Redouane

Rahmani

et al. 2022

Sci Rep

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In process engineering as chemical and biotechnological industry, agitated vessels are commonly used for various applications; mechanical agitation and mixing are performed to enhance heat transfer and improve specific Physico-chemical characteristics inside a heated tank. The research subject of this work is a numerical investigation of the thermo-hydrodynamic behavior of viscoplastic fluid (Casson–Papanastasiou model) in a stirred tank, with introducing a new anchor impeller design by conducting some modifications to the standard anchor impeller shape. Four geometry cases have been presented for achieving the mixing process inside the stirred vessel, CAI; classical anchor impeller, AI1; anchor impeller with added horizontal arm blade, AI2 and AI3 anchor impeller with two and three added arm blades, respectively. The investigation is focused on the effect of inertia and plasticity on the thermo-hydrodynamic behavior (flow pattern, power consumption, and heat transfer) by varying the Reynolds number (Re = 1, 10, 100, 200), Bingham number (Bn = 1, 10, 50), in addition to the effect of geometry design in the overall stirred system parameters. The findings revealed an excellent enhancement of flow pattern and heat transfer in the stirred system relatively to the increase of inertia values. Also, an energy reduction has been remarked and the effect of anchor impeller shape. AI3 geometry design significantly improves the flow pattern and enhances heat transfer by an increased rate of 10.46% over the other cases.

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Section: List Of Symbolsmentioning

confidence: 99%

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Benhanifia

Redouane

Rahmani

et al. 2022

Sci Rep

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show abstract

“…In this regard, numerical and experimental investigations on these nanofluids have been carried out to enlarge the understanding on the heat transfer rate improvement in different applications [22,23]. Moreover, the addition of nanoparticles marks its positive effect in different processes, in the case of natural convection [24,25], in forced and mixed convection in several industrial applications such as stirred tanks [26,27], cavities [28][29][30][31] and downward-facing straight ducts [32,33].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Magnetohydrodynamic Mixed Convection inside an Extended Curved Duct in the Presence of a Nanofluid of Different Metallic Oxides Nanoparticles

Derbal,

Bouzit,

Mokhefi

et al. 2024

DDF

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The numerical work presented in this paper focuses on the influence of the magnetic field and the nanoparticles metallic nature on the hydrodynamic and thermal behavior of a nanofluid flowing in an extended curved duct. It deals with a semi-toroidal curved duct with an expanded circular section. The narrowed part of this duct from which the nanofluid enters with a cold temperature, is considered to be thermally insulated. However, the extended part is kept at a constant hot temperature. The nanoparticles used in the present study respectively are Alumina (Al2O3), copper oxide (CuO) and iron trioxide (Fe3O4). In this study, the effects of inertia, buoyancy and Lorentz forces as well as the metallic nature of the nanoparticles suspended in the pure water have been highlighted on the thermal, hydrodynamic and economic levels. The study is based on the resolution of the classical monophasic equations governing the non-isothermal flow of nanofluids by the use of finite element method, namely: the mass, momentum and energy equations. The obtained results have shown that the buoyancy and inertia forces strongly favor the global heat exchange rate. Moreover, the magnetic force acts negatively on these thermal exchanges. Furthermore, the CuO nanoparticles have demonstrated a better heat transfer rate, approximately 7% higher than that of pure water. Nevertheless, according to the economic needs, we suggest we suggest using alumina nanoparticles, as their transfer rate is comparable to that of CuO nanoparticles. It should be noted, that this study provides important insights for many industrial applications where the curved ducts are strongly presented.

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“…Heshmati and Mohammed [42] add the effect of four-geometry baffles at different inclinations and positions, and different parameters were considered. Mokhefi et al [43][44][45][46] performed numerical simulations to study the laminar flow behavior of anchor-induced nanofluids in stirred vessels using the singlephase nanofluid model, where heat transfer is significant with the progressive addition of alumina nanoparticles with an increase in stirring power consumption.…”

Section: Introductionmentioning

confidence: 99%

Effect of the inclination angle of finned cylinder over a BFS on the MHD behavior in the presence of a nanofluid

Derbal

Bouzit

2022

Metall Mater Eng

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The present numerical study is based on the forced magnetohydrodynamic (MHD) convection of a ferrofluid through a backward facing step (BFS). A cylinder with two fixed fins and fixed dimensions is implanted inside fluid. The dimensionless governing equations have been solved using the multigrid finite element method. Several parameters were considered, such as the Hartmann number 0≤ Ha ≤100, the magnetic field inclination angle 0°≤ ɣ ≤90°, the Reynolds number 10≤ Re ≤200, the nanoparticle volume fraction 0%≤ φ ≤10%, and the fins inclination angle 0°≤ a ≤180°. The results have shown that the presence of the fins improves the heat transfer, especially at the position a = 90° where the Nuave number increases with a ratio of 113% for Re = 200.

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Numerical investigation of mixed convection in an anchor-stirred tank filled with an Al2O3-water nanofluid

Cited by 8 publications

References 38 publications

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Investigation of mixing viscoplastic fluid with a modified anchor impeller inside a cylindrical stirred vessel using Casson–Papanastasiou model

Numerical Investigation of the Magnetohydrodynamic Mixed Convection inside an Extended Curved Duct in the Presence of a Nanofluid of Different Metallic Oxides Nanoparticles

Effect of the inclination angle of finned cylinder over a BFS on the MHD behavior in the presence of a nanofluid

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