Free convection enhancement in an annulus between horizontal confocal elliptical cylinders using hybrid nanofluids

Tayebi, Tahar; Chamkha, Ali J.

doi:10.1080/10407782.2016.1230423

Cited by 137 publications

(30 citation statements)

References 41 publications

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“…The authors introduced a correlation for the mean Nusselt number versus the Rayleigh number, Prandtl number, the power law index and nanoparticles volume fraction. The influence of buoyancy on heated cylinder at mixed convection for Bingham plastic fluid [27] and effects of variable viscosity property of Al2O3-water nanofluid [28,29] on the heat transfer characteristics are studied numerically. The resultfroms said when increasing Re, Pr, Bn, Ri, the momentum and thermal boundary layers become thinner over the cylinder; also, the pressure coefficient, the drag coefficient, the volume fraction and the mean Nusselt numbers are discussed.…”

Section: Introductionmentioning

confidence: 99%

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

2021

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This work is about studying the natural convection of two-dimensional steady state non-Newtonian power law fluid numerically. The inner cylinder was put eccentrically into the outer one. The cylinders are held at constant temperatures with the inner one heated isothermally at temperature Th and the outer one cooled isothermally at temperature Tc (Th>Tc). The simulations have been taken for the parameters 10 3 ≤Ra≤10 5 , 10≤Pr≤10 3 , 0.6≤n≤1.4, 0≤ɛ≤0.9 and an inclination angle ϕ from 0° up to 90°. The average Nusselt numbers for the previous parameters are obtained and discussed numerically. The results revealed that the average Nusselt number has the highest values when n=0.6, Ra=10 5 at ϕ=0 which is a signal for the large transfer herein and has the lowest values for n=1.4, Ra=10 3 at ϕ=90° which is a signal that the transfer is by conduction more than convection. Furthermore, the increasing of eccentricity causes an increase in the Nusselt number for all the cases. Finally, the best case where we can get the best heat transfer is at ϕ = 0, ɛ=0.9 among them all. The results have compared with some precedent works and showed good agreement.

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Section: Introductionmentioning

confidence: 99%

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

2021

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“…Presently, Tassaddiqet al [11]investigated couple stress magneto-hydrodynamic nanofluid thin film flow over an exponential stretching sheet with joule heating and viscous dissipation. Tahar and Chamkha [12] discussed the flow of a hybrid nanofluid through horizontal and confocal elliptical cylinders with natural convection enhancement. Moreover, it has been determined that the key aim of including the nanomaterials in a transferor liquid is to augment its thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Darcy-Forchheimer MHD Hybrid Nanofluid Flow and Heat Transfer Analysis over a Porous Stretching Cylinder

et al. 2020

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This research work deals with investigation of the thermal characteristics of the Darcy–Forchheimer hydromagnetic hybrid nanofluid (Al2O3-Cu/H2O) flow through a permeable stretching cylinder. The model equations, which consist of continuity, momentum, and energy equations, are converted to a set of coupled ordinary differential equations through similarity variables transformations and appropriate boundary conditions. Brownian motion and Thermophoresis effects are mainly focused in this work. The impacts of some interesting parameters over velocity, temperature, and concentrations profiles are graphically studied. The present study will be helpful in understanding the thermal characteristics of heat transfer liquids.

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“…Bhargava et al [40] studied hybrid method on mixed convection flow of nanofluid on an inclined plane in a porous medium and shown that the concentration of nanoparticles decreases with increasing mixed convection parameter. Tayebi and Chamkha [41] analyzed natural convection in an annulus between two confocal elliptic cylinders filled with a Cu-Al 2 O 3 /water hybrid nanofluid and concluded that employing a Cu-Al 2 O 3 /water hybrid nanofluid is more efficient in heat transfer rate compared to the similar Al 2 O 3 /water nanofluid. S. Devi and A. Devi [42] discussed hybrid nanofluid flow over a three-dimensional stretching sheet and observed that heat transfer rate of Hybrid nanofluid (Cu-Al 2 O 3 /Water) is seemed to be higher than that of Nanofluid (Cu/Water).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat Transfer Enrichment in Hydromagnetic Flow of Hybrid Nanofluid Along Vertical Wavy Surface

Iqbal¹,

Mustafa²,

Ghaffari³

2019

JMAG

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The hybrid nanofluids are novel nanofluids and can be made by adding different types of nanoparticles in the plain fluid. The mathematical modeling of hybrid nanofluid under the magnetic influence over a vertical wavy surface is developed in the present theoretical investigation. The analysis is performed for hybrid nanofluid consisting of Al 2 O 3-SiO 2 nanoparticles and compared with SiO 2 nanoparticle. The theoretical results also indicate that Al 2 O 3-SiO 2 water hybrid nanofluid have higher heat transfer rate when compared with SiO 2-water nanofluid. In hybrid nanofluid, the choice of a suitable mixture of nanoparticles can lead to desire heat transfer phenomena. The implicit finite difference scheme is utilized for solution purposes. Results are presented in tabular and graphical form for the choice of suitable parameters.

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Free convection enhancement in an annulus between horizontal confocal elliptical cylinders using hybrid nanofluids

Cited by 137 publications

References 41 publications

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

Darcy-Forchheimer MHD Hybrid Nanofluid Flow and Heat Transfer Analysis over a Porous Stretching Cylinder

Analysis of Heat Transfer Enrichment in Hydromagnetic Flow of Hybrid Nanofluid Along Vertical Wavy Surface

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