Natural convection of CNT-water nanofluid in an annular space between confocal elliptic cylinders with constant heat flux on inner wall

Tayebi, Tahar; Chamkha, Ali J.; Djezzar, Mahfoud

doi:10.24200/sci.2018.21069

Cited by 16 publications

(13 citation statements)

References 47 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Ramaiah¹,

Surekha

Gangadhar

et al. 2020

Heat Trans

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In the present work, the effects of the transfer of heat, as well as the mass phenomenon of a Maxwell fluid in revolving flow over a unidirectional stretching surface are discussed. The result of the magnetic field within the boundary layer is considered. In the energy equation, the heat flux model of non-Fourier Cattaneo-Christov is employed. The customized Arrhenius function for energy activation is used. By using the transformation strategy, nondimensional expressions are achieved. To predict the highlights of the current effort, the result of the emerging nonlinear differential structure is calculated with the aid of the shooting procedure as well as the Runge-Kutta Fehlberg procedure. The influence of velocity and temperature along with concentration profiles for various physical parameters is analyzed. The involvement of fluid relaxation and thermal retardation phenomena is unequivocally mentioned.The evolution of heat transfer, as well as the rate of mass in the flow of fluids, is illustrated by the use of graphs in addition to tables. Furthermore, the current effort is confirmed by examination with previously published results, which establishes a strategy for the execution of a numerical approach. It is observed that the concentration of a solute in dual combination is relative to both rotation parameters along with activation energy. Besides this, a diminishing pattern in the distribution of temperature is described within the existence of the Cattaneo-Christov flux law by association with the rate of heat transfer because of Fourier's law. The present investigation can be applied in numerous engineering and technical procedures including the development of thin sheets, modeling of plastic sheets, in the lubrication system industry related to polymers, compression, and injection shaping in the area of chemical production and bimolecular reactions. Inspired by those applications, the present work is undertaken. K E Y W O R D S Arrhenius activation energy, Cattaneo-Christov heat flux model, chemical reaction, Maxwell fluid, MHD, rotating frame

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Section: Introductionmentioning

confidence: 99%

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

Ramaiah¹,

Surekha

Gangadhar

et al. 2020

Heat Trans

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“…Also, they [45][46][47][48] studied the applications of hybrid nanofluids in solar energy and other heat transfer claims. One of the most important topics in this field is the magnetic effect on the nanofluid behaviors which is widely investigated by the Chamkha et al [49][50][51][52][53][54][55][56][57][58][59][60][61] in different geometries. Also, they [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78] investigated the other important parameters such as sinusoidal heating, porous media, wall thickness, entropy generation, hybrid nanofluids, flexible membrane, etc.…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection Heat Transfer of Sio2-Water and Alumina-Pao Nano-Lubricants Used in a Mechanical Ball Bearing

Hatami¹,

Ali²,

Alsabery³

et al. 2021

Journal of Thermal Engineering

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In this study, the mixed convection heat transfer in a mechanical ball bearing filled with nano-lubricants were investigated theoretically. In our case, the bearing including eight balls revolving in counter clockwise while the inner shaft rotates in clockwise direction and the inner and outer walls of bearing were kept at constant hot and cold temperatures, respectively. Two kinds of nano-lubricants SiO2-water and Alumina-Polyalphaolefin (PAO) with different shapes of nanoparticles were considered. The governing equations including velocity, pressure, and temperature formulation were solved based on the Galerkin finite element method. The governing parameters such as nanoparticle volume fraction, Reynolds and Rayleigh numbers, etc., were discussed. It turns out that the average Nusselt number increases by increasing the nanoparticle volume fraction (averagely 15% for each 0.02 increase) and the oil-based nano-lubricant has greater Nusselt number than the water based one. More importantly, the Nono-rod Alumina was found to show much greater heat transfer performance (averagely 5%) than the spherical alumina nanoparticles and nano-rod Alumina-PAO has the best performance and maximum Nusselt numbers for the heat transfer.

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“…Using nanoparticles in fluid flows for enhancement of heat transfer has been proposed by many researchers in recent years. Due to higher thermal conductivity (Abadi et al, 2020;Ahmadi et al, 2020;Alotaibi et al, 2020;Aramesh et al, 2020;Loni et al, 2018;Maddah et al, 2018;Sadeghzadeh et al, 2020), nanoparticles are able to manipulate the thermo-physical properties of the base fluid and eventually present a new fluid called nanofluid with the capability of higher rate of heat transfer (Aghayari et al, 2020;Aybar et al, 2015;Ghalandari et al, 2019;Ghodsinezhad et al, 2016;Sharma et al, 2020;Tayebi et al, 2019;Tshimanga et al, 2016;Williams et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Nanofluid flow and shear layers between two parallel plates: a simulation approach

Mahdavi

Sharifpur

Ahmadi

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The impact of presence of nano-scale particles inside a flow between two flat plates which known as Poiseuille flow is numerically analyzed. Nanofluids have been investigated in the past few years mainly by considering the heat transfer aspect in a fully developed section of internal flows, rather than detailing the hydrodynamic and thermal developing viewpoint of nanofluid. In other words, this research will focus on the fundamental understanding of developing nanoparticles flows in hydrodynamic and thermal boundary layers in the entrance region. Therefore, flow between two flat plates is numerically studied here by injecting and tracking nanoparticles from inlet to outlet of the channel. The flow is kept in the laminar regime with uniform heat flux applied on the plates. ANSYS Fluent 19.3 is used to numerically solve the continuity and momentum equations, as well as discrete phase modeling for particles. The results showed three major stages in vorticity development in the entrance region. It was found that Brownian motion plays an important role in nanoparticles migration, and close to the wall with the involvement of Thermophoresis. Also, nanoparticles can deviate from flow layers after merging boundary layers.

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Natural convection of CNT-water nanofluid in an annular space between confocal elliptic cylinders with constant heat flux on inner wall

Cited by 16 publications

References 47 publications

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

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

Mixed Convection Heat Transfer of Sio2-Water and Alumina-Pao Nano-Lubricants Used in a Mechanical Ball Bearing

Nanofluid flow and shear layers between two parallel plates: a simulation approach

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