Analysis of entropy generation in combined buoyancy-Marangoni convection of power-law nanofluids in 3D heterogeneous porous media

Zhuang, Yijie; Zhu, Qunyi

doi:10.1016/j.ijheatmasstransfer.2017.11.013

Cited by 42 publications

(11 citation statements)

References 45 publications

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“…Non-homogeneous model has been used by few researchers to study natural convection of the nanofluids saturated porous cubic cavities. Zhuang and Zhu 36 , 37 studied the buoyancy Marangoni convection of non-Newtonian nanofluids with a heterogeneous porous medium, numerically, by applying the finite volume method. They found that the level of heterogeneity controls the entropy generation and decreases the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Impacts of the properties heterogeneity on 3D magnetic dusty nanofluids flow in porous enclosures with cylinders

Rashed

2022

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This paper examines the controlling of the three dimensional dusty nanofluid flow using the two circular cylinders having different thermal conditions. The cylinders are located in the middle area while the location of the right cylinder is changeable. The 3D (three dimensional) cubic flow domain is filled by a non-Darcy porous medium and a magnetic field in Z-direction is taken place. The non-homogeneous two phase model of the nanofluid is applied while the permeability and thermal conductivity of the porous medium are assumed heterogonous. The current situation is represented by two systems of the equations for the nanofluid and dusty phases. The solutions methodology is depending on the 3D SIMPLE scheme together with the finite volume method. Here, It is focused on the distance between the cylinders $$\delta\, (0.3\le \delta \le 0.6)$$ δ ( 0.3 ≤ δ ≤ 0.6 ) , the Darcy number $$Da\, ({10}^{-2}\le Da\le {10}^{-5})$$ D a ( 10 - 2 ≤ D a ≤ 10 - 5 ) , the dusty parameter $${\alpha }_{d}\,(0.001\le {\alpha }_{d}\le 0.1)$$ α d ( 0.001 ≤ α d ≤ 0.1 ) , the average nano-parameter $${\phi }_{av}\,(0.01\le {\phi }_{av}\le 0.03)$$ ϕ av ( 0.01 ≤ ϕ av ≤ 0.03 ) . The major outcomes indicating to that the flow can be well controlled using the inner isothermal cylinders. Also, the cases of the heterogeneity in $$X{-}Y$$ X - Y and $$X{-}Z$$ X - Z directions give the lowest values of $${Nu}_{av}$$ Nu av . Both the flow and heat transfer rate are enhanced as $$\delta $$ δ is increased.

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Section: Introductionmentioning

confidence: 99%

Impacts of the properties heterogeneity on 3D magnetic dusty nanofluids flow in porous enclosures with cylinders

Rashed

2022

Sci Rep

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“…The simulation results showed that the heat transfer coefficient improves by 83% compared to water, with an aspect ratio of 0.25 and with a 5% concentration of nanoparticles. The conjugate convection of Marangoni of a pseudoplastic nanofluid consisting of CMC/water with the addition of CuO particles is investigated by Zhuang and Zhu [4,5]. The simulation is carried out in a cubic cavity with a porous insert in order to study entropy generation [4] and the intensity of convective heat and mass transfer [5].…”

Section: Introductionmentioning

confidence: 99%

Thermogravitational convection of a pseudoplastic nanofluid with varying parameters in an enclosure having a thermally generating wall section

2022

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Researching new and optimizing existing methods of cooling electronic devices are the most important tasks in the modern world. Based on this, our work is devoted to the study of the possibility of intensifying the heat removal from a heated element using natural convective energy transport of a pseudoplastic nano liquid in a cavity. The problem is described by unsteady Oberbeck-Boussinesq differential equations and is solved on the basis of the finite difference method. To calculate the effective parameters of a nanofluid, three sets of different models are used, including temperature dependences. The work also studied the effect of nanoparticles' various types and their volume fraction on flow structure and heat transfer. The results showed that the use of copper oxide as nanoparticles and the correlations of Guo et al. and Jang & Choi can lead to intense cooling of the bottom wall heated section.

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“…Examples of this significance are vaporizing droplets, crystal growth, drying silicon wafers, stabilizing the soap films, glass manufacturing, liquid melting and re‐solidifying, welding, and so forth. The finite volume scheme is applied by Zhuang and Zhu 6 to study the Marangoni convection within three‐dimensional (3D) Marangoni convection and entropy of nanofluids of type power‐law fluids. Heterogeneous properties of the included porous medium are assumed.…”

Section: Introductionmentioning

confidence: 99%

Thermosolutal Marangoni convection of Bingham non‐Newtonian fluids within inclined lid‐driven enclosures full of porous media

2021

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Multiconvection modes together with the entropy generation due to Marangoni effects, movement of the side walls, and double‐diffusive convection within lid‐driven enclosures filled by a porous medium are examined. The current flow domain is an inclined non‐Darcy porous geometry having a top free surface where linear expressions in terms of the temperature and concentration are presented for the surface tension. The dynamic viscosity of the suspension has an exponential profile and the convective boundary conditions are taken into account. The finite volume method in which values of the pressure are computed using the SIMPLE algorithm is applied to solve the governing system. The non‐Newtonian Bingham fluids are applied for different governing parameters, such as Grashof number, Reynolds number, Marangoni number, Darcy number, inclination angle of the cavity, Biot number, Bingham number, and geometrical parameters. It is observed that a rise in the Bingham number from 0 to 0.5 causes a decrease in the average Bejan number up to 4.77%. Also, the averaged and mixing temperatures are augmented as the inclination angle is altered, regardless values of the Biot number.

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Analysis of entropy generation in combined buoyancy-Marangoni convection of power-law nanofluids in 3D heterogeneous porous media

Cited by 42 publications

References 45 publications

Impacts of the properties heterogeneity on 3D magnetic dusty nanofluids flow in porous enclosures with cylinders

Impacts of the properties heterogeneity on 3D magnetic dusty nanofluids flow in porous enclosures with cylinders

Thermogravitational convection of a pseudoplastic nanofluid with varying parameters in an enclosure having a thermally generating wall section

Thermosolutal Marangoni convection of Bingham non‐Newtonian fluids within inclined lid‐driven enclosures full of porous media

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