MHD mixed convection in an inclined cavity containing adiabatic obstacle and filled with Cu–water nanofluid in the presence of the heat generation and partial slip

Ahmed, Sameh E.; Mansour, M. A.; Hussein, Ahmed Kadhim; Mallikarjuna, B.; Almeshaal, Mohammed A.; Kolsi, Lioua

doi:10.1007/s10973-019-08340-3

Cited by 64 publications

(13 citation statements)

References 45 publications

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“…They concluded that the addition of nanoparticles contributes to the apparition of more complex flow structures. Ahmed et al (2019) investigated the effect of using an adiabatic obstacle on the mixed convective heat transfer of dispersed Cu in water by considering the effect of an external magnetic field. It was found that the obstacle and the magnetic effects collaborate in controlling the flow.…”

Section: Introductionmentioning

confidence: 99%

Control of the free convective heat transfer using a U-shaped obstacle in an Al2O3-water nanofluid filled cubic cavity

Al-Sayagh¹

2021

Int. j. adv. appl. sci.

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This paper deals with the study of free convection in a 3D enclosure filled with Al2O3-nanofluid and equipped with a U-shaped obstacle. The used U-shaped obstacle is considered perfectly conductive. The effect of the dimension and the orientation of the obstacle is investigated. In addition, the parameters governing the problem are varied as Rayleigh number (103 to 106), and nanoparticles volume fraction (0 to 7.5%). Results are depicted in terms of flow structures, temperature fields, and Nusselt number. Results show that the obstacle dimension and orientation can control the flow and optimize the heat transfer and the addition of nanoparticles enhances significantly Nusselt number.

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Section: Introductionmentioning

confidence: 99%

Control of the free convective heat transfer using a U-shaped obstacle in an Al2O3-water nanofluid filled cubic cavity

Al-Sayagh¹

2021

Int. j. adv. appl. sci.

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“…Al‐Rashed et al 34 performed three‐dimensional numerical modeling on a cubical enclosure applying finite volume method where entropy generation (thermal) escalated by mounting nanoparticles concentration for Ri , but the deviation of entropy generation (viscous) with concentrations depended on Richardson numbers. Mixed convective flow inside inclined/trapezoidal enclosures filled with Cu–water, micropolar nanofluids in the presence of insulated obstacle, heat generation, partial slip symmetry, MHD, and so forth, have been investigated by Ahmed et al 35,36 The authors found better heat transfer performance of nanofluid than water for weak magnetic field, but a considerable effect is observed in reverse process for strong magnetic field and partial slip symmetry. Kamel et al 37 focussed on boiling heat transport by nanofluids, reviewed current experimental articles, displayed newest results connected with this topic, and drew round to account the effect of few parameters related to operating circumstances and nanoparticles morphology on heat transport coefficient and critical heat flux.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of hybrid/single nanofluids on augmentation of heat transport in lid‐driven undulated cavity

et al. 2020

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This numerical study reveals the heat transfer performance of hybrid/single nanofluids inside a liddriven sinusoidal trapezoidal-shaped enclosure. The right and left inclined surfaces of the trapezium have been considered as insulated, whereas the bottom sinusoidal wavy and the flat top surfaces of the enclosure as hot and cold, respectively. The governing partial differential equations of fluid's velocity and temperature have been resolved by applying the finite element method. The implications of Prandtl number (4.2-6.2), Richardson number (0.1-10.0), undulation number (0-3), nanoparticles volume fraction (0%-3%), and nanofluid/base fluid (water, water-copper (Cu), water-Cu-carbon nanotube, water-Cu-copper oxide (CuO), water-Cu-TiO 2 , and water-Cu-Al 2 O 3) on the velocity and temperature profiles have been studied. Simulated findings have been represented by means of streamlines, isothermal lines, and average Nusselt number of above-mentioned hybrid nanofluids for varying the governing parameters. The comparison of heat transfer rates using hybrid nanofluids and pure water has been also shown. The heat transfer rate is increased about 15% for varying Richardson number from 0.1 to 10.0. Blending of two nanoparticles suspension in base fluid has a higher heat transfer rate-approximately 5% than a mononanoparticle. Moreover, a higher average Nusselt number is obtained by 14.7% using the wavy surface than the flat surface of the enclosure. Thus, this study showed that applying hybrid nanofluid may be beneficial to obtain expected thermal performance.

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“…In recent years, the use of nanofluids has taken on a new form, not only in academic applications such as microchannel is common, but also use in heat exchangers; solar energy is very popular, and throughout these articles the above points can be seen. [56][57][58][59][60][61][62]. In [63], they have provided several articles related to the two-phase approach, but the novelty of this study against them is that three main factors to enhance heat transfer rate are gathered to each other.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of different innovative turbulators on the turbulent flow field and heat transfer of a multi-phase hybrid nanofluid

Mahani

Ahmadi

Hezaveh

et al. 2020

J Therm Anal Calorim

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This study investigates the heat index by combining factors affecting the enhancement of heat transfer, including the modeling of three turbulators with 3D innovative geometries, hybrid nanofluid, including Cu and Al 2 O 3 , and high Reynolds numbers. Using the Eulerian method and the phase-coupled simple algorithm, a 3D tube in which turbulators with different sizes were embedded along with a hybrid nanofluid with a two-phase view were investigated. The geometry of rectangular turbulator is a = 1 cm, b = 3, 5, and 7 cm, and L = 40 cm, and geometry of twisted rectangular turbulator is like rectangular turbulator, and each part has a 5-cm length; also, the geometry of triangular turbulator is considered with b = 3, 5, and 7 cm, and L = 40 cm. In the two-phase view, because each phase can have a different velocity gradient and a different temperature gradient, the results were close to the experimental results. The results indicated that turbulators, hybrid nanofluid, and Reynolds number influenced heat transfer rate enhancement; for the rectangular turbulator, changing the turbulator size, volume fraction, and Reynolds number from the minimum values to the maximum values increased heat transfer by 49.17%. The same conditions increased heat transfer for the twisted rectangular and triangular turbulators by 44.28% and 45.19%, respectively. The proposed factors are practical and can be beneficial in heat transfer and fluid mechanics. Overall, at minimum conditions Re = 15,000 and φ = 0% up to maximum conditions Re = 25,000 and φ = 4% for rectangular, twisted rectangular, and triangular turbulators increasing heat transfer rates of 79.49%, 97.5%, and 82.45% have been observed, respectively.

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MHD mixed convection in an inclined cavity containing adiabatic obstacle and filled with Cu–water nanofluid in the presence of the heat generation and partial slip

Cited by 64 publications

References 45 publications

Control of the free convective heat transfer using a U-shaped obstacle in an Al2O3-water nanofluid filled cubic cavity

Control of the free convective heat transfer using a U-shaped obstacle in an Al2O3-water nanofluid filled cubic cavity

Performance analysis of hybrid/single nanofluids on augmentation of heat transport in lid‐driven undulated cavity

Investigating the effects of different innovative turbulators on the turbulent flow field and heat transfer of a multi-phase hybrid nanofluid

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