Study of heat transfer by natural convection of nanofluids in a partially heated cylindrical enclosure

Guestal, Mabrouk; Kadja, Mahfoud; Hoang, Mai Ton

doi:10.1016/j.csite.2018.01.008

Cited by 40 publications

(12 citation statements)

References 15 publications

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“…The obtained results indicate that the heat transfer improves and convective flow reduces when the distance between the heater and the cold vertical wall decreases. Guestal et al [14] carried out a numerical study on heat transfer by natural convection of two nanofluids in a partially heated horizontal cylindrical enclosure. The Nusselt number was correlated in terms of the Rayleigh number, the heated length and the nanoparticles volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Moutaouakil¹,

Boukendil²,

Zrikem³

et al. 2020

IJHT

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This study investigates the effect of thermal radiation on natural convection of several water-based nanofluids H2O-(Cu, Al2O3, Ag, TiO2) in a partially heated cubical cavity where the left vertical side is heated by three identical and parallel elements. The right vertical side is totally cooled, and the other ones are kept adiabatic. A developed code based on the finite volume method and the Rosseland approximation is used to solve the governing equations. Calculations were performed for three inclination angles of the rectangular heating elements 0°, 45° and 90°. The effect of governing parameters, namely, Rayleigh number, solid volume fraction, radiation parameter, dimensionless spacing of the three heating elements, their aspect ratio and different type of nanoparticles on the velocity contours, isotherms as well as local and average Nusselt number were considered. The results indicate that the inclination angle has a considerable effect on the dynamic and thermal fields, but its effect on the average heat transfer is insignificant. The total Nusselt number increases with the volume fraction of nanoparticles, the radiation parameter and the aspect ratio of the heated elements. The numerical results also revealed that the Cu and Ag-water nanofluid offer a better heat exchange.

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Section: Introductionmentioning

confidence: 99%

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Moutaouakil¹,

Boukendil²,

Zrikem³

et al. 2020

IJHT

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“…Dogonchi et al 2018, [35] concluded that reduction the radius of the hot semicircle bottom wall of triangular cavity filled with Cu-water-nanofluid enhances the heat transfer rate at the absence of the magnetic field. Mabrouk et al 2018, [36] used Cu-water and TiO2-water nanofluids in a partially heated horizontal cylindrical enclosure to prove that the length of heat source affects strongly the natural convection heat transfer. Sadia et al 2018, [37] showed that the thicknesses of momentum and thermal boundary layers flow of a nanofluid past a sinusoidal semi-infinite vertical surface increase significantly as the amplitude of the wavy surface increases.…”

Section: Introductionmentioning

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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“…One of the common methods to enhance the thermal properties of fluids is to mix nano-particles with the particle size of less than 100 nm to fluids to reach the desired properties [11]. Usually, nano-particles include particles of pure metals such as Cu, Au, Ag or metal oxides like Al 2 O 3 , SiO 2 or Fe 2 O 3 , which can enhance the thermal conductivity and heat capacity [12][13][14][15][16][17][18][19][20][21]. Choi et al introduced nano-particle usage in utilizing heat transfer for the first time and showed that the usage of nanofluid could enhance thermal conductivity by 7 percent [22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mixed Convection in a Cylindrical Lid Driven Cavity Filled with Water-Cu Nanofluid

et al. 2019

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The present numerical research studies the effect of nano-materials in a lid-driven cylindrical cavity with rotation of circumferential top wall. The heat is transferred from two lateral walls to the domain by constant temperature conditions while other walls are kept isolated. The non-dimensional equations are solved by Finite Volume Method (FVM) and SIMPLEC method. The effect of Reynolds (Re = 100, 400, 1000), Ryleigh (Ra = 104, 105, 106) numbers are studied. In addition, the effect of concentration of nano materials (ϕ = 0%, 1%, 5%), the Height Ratio (HR = 1, 0.5, 2) on Nusselt number, isotherm lines and streamlines are studied. The results show that Reynolds number also can change the effect of nano particles on the heat transfer rate. It is observed that the height ratio increase can improve the Nusselt number since the number and the size of vortices inside the cavity changes. In addition, increase of Ra number can change the flow structure inside the cavity which can help in increasing of Nusselt number.

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Study of heat transfer by natural convection of nanofluids in a partially heated cylindrical enclosure

Cited by 40 publications

References 15 publications

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

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

Investigation of Mixed Convection in a Cylindrical Lid Driven Cavity Filled with Water-Cu Nanofluid

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