WITHDRAWN: Mathematical modelling of free convection in an ellipse-rectangular annulus filled with nanofluid using LBM

Surendar, Aravindhan; Muralidharan, Janani Srree; Saee, Ali Dehghan; Maseleno, Andino; Rudenko, A. A.; Ross, David

doi:10.1016/j.tsep.2019.100375

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Also, they showed that the heat transfer rate for Ag-water nanofluid is higher than CuOwater and Al2O3 -water nanofluids. Aravindhanet al 2019, [39] concluded that the heat transfer rate around rectangular cylinder enclosed by an elliptical cylinder filled with CuOwater nanofluid at curved boundary conditions enhances as the solid volume fraction of nanofluid increases. Ammar et al 2019, [40] used annulus with inner hot corrugated cylinder and outer cooled wavy-cylinder filled with two layers.…”

Section: Ravnik and šKerget 2015mentioning

confidence: 99%

Prediction of Natural Convection Heat Transfer Phenomena of Nanofluids in Corrugated Annulus

Aljobair¹,

Mohammed²,

Alesbe³

2020

Preprint

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Abstract The natural convection heat transfer and fluid flow characteristic of water based Al2O3 nano-fluids in a symmetrical and unsymmetrical corrugated annulus enclosure has been studied numerically using CFD. The inner cylinder is heated isothermally while the outer cylinder is kept constant cold temperature. The study includes eight models of corrugated annulus enclosure with constant aspect ratio of 1.5. The governing equations of fluid motion and heat transfer are solved using stream-vorticity formulation in curvilinear coordinates. The range of solid volume fractions of nanoparticles extends from PHI=0 to 0.25, and Rayleigh number varies from 104 to 107. Streamlines, isotherms, local and average Nusselt number of inner and outer cylinder has been investigated in this study. Sixty-four correlations have been deduced for the average Nusselt number for the inner and outer cylinders as a function of Rayleigh number have been deduced for eight models and five values of volume fraction of nano particles with an accuracy range 6-12 %. The results show that, the average heat transfer rate increases significantly as particle volume fraction and Rayleigh number increase. Also, increase the number of undulations in unsymmetrical annuli reduces the heat transfer rates which remain higher than that in symmetrical annuli. There is no remarkable change in isotherms contour with increase of volume fraction of nanofluid.

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Section: Ravnik and šKerget 2015mentioning

confidence: 99%

Prediction of Natural Convection Heat Transfer Phenomena of Nanofluids in Corrugated Annulus

Aljobair¹,

Mohammed²,

Alesbe³

2020

Preprint

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“…Natural convective heat transfer characteristics in enclosures have a great significance in industrial applications such as solar collectors, thermal storage systems, cooling of nuclear reactors, etc. In past years, different methods were used to augment the heat transfer in enclosures such as using porous media [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ] and nanotechnology [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. The corrugated annulus is a type of enhanced heat transfer techniques.…”

Section: Introductionmentioning

confidence: 99%

Natural convection heat transfer in corrugated annuli with H2O-Al2O3 nanofluid

Aljabair

Mohammed

Alesbe

2020

Heliyon

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The present work includes a numerical study of natural convection heat transfer in symmetrical and unsymmetrical corrugated annuli filled with H 2 O-Al 2 O 3 nanofluid. In this study, higher and lower temperatures were kept constant at inner and outer cylinders of the annulus; respectively. Eight mathematical models with an aspect ratio of 1.5 were developed to find the best model giving the highest heat transfer rates. The stream-vorticity formulation in curvilinear coordinates was used to solve the governing equations of heat transfer and fluid motion. The influences of Rayleigh number. ðð10 3 Ra 10 6 Þ and volume fraction of nanoparticles. (0 ϕ 0:25Þ on isotherms, streamlines, local and average Nusselt numbers on the inner and outer cylinder were investigated. The results show that the heat transfer rate is significantly increased with an increase in nanoparticles volume fraction and Rayleigh number. The activity of the heated surface is increased with an increase in the undulation number, but the flow motion tends to be most difficult in the spaces between active undulation walls. Moreover, the heat transfer rates in unsymmetrical annuli are relatively higher than the rates in the symmetrical annuli. There are no evident changes in isotherms with an increase in the nanofluid volume fraction. Correlations for the mean Nusselt number on the inner and outer walls of annulus were deduced as a function of Rayleigh number and nanoparticles volume fraction for eight models with an accuracy range of 8-15 %.

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Natural convection and surface radiation in an insulated square cavity with inner hot and cold square bodies

Boukendil

Moutaouakil

Zrikem

et al. 2021

Materials Today: Proceedings

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WITHDRAWN: Mathematical modelling of free convection in an ellipse-rectangular annulus filled with nanofluid using LBM

Cited by 4 publications

References 22 publications

Prediction of Natural Convection Heat Transfer Phenomena of Nanofluids in Corrugated Annulus

Prediction of Natural Convection Heat Transfer Phenomena of Nanofluids in Corrugated Annulus

Natural convection heat transfer in corrugated annuli with H2O-Al2O3 nanofluid

Natural convection and surface radiation in an insulated square cavity with inner hot and cold square bodies

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