Effect of differentially heated tubes on natural convection heat transfer in a space between two adiabatic horizontal concentric cylinders using nano-fluid

Ma, Yulin; Jamiatia, Mojtaba; Aghaei, Alireza; Sepehrirad, Mohammad; Dezfulizadeh, Amin; Afrand, Masoud

doi:10.1016/j.ijmecsci.2019.105148

Cited by 25 publications

(4 citation statements)

References 55 publications

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“…Finite element analysis with an evenly heated square cylinder in a magnetized curved channel was investigated by Abdelmalek et al [40], and in a magnetic frame of reference, the pressure is greatest on the left side of the square obstruction was concluded. The impact of employing nanofluid to heat naturally conventionally in the area between two isothermal horizontal cylinders that are concentric was investigated by Ma et al [41].…”

Section: Introductionmentioning

confidence: 99%

Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Mahmud,

Molla

2024

Phys. Scr.

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The Galerkin weighted residual finite element method (GFEM) has been used to numerically investigate the natural convection flow of two-phase Bingham hybrid nanofluid in a square cavity with a corrugated cylinder at the center. The base fluid here is water. The hybrid nanofluid is made of Fe$_3$O$_4$-CoFe$_2$O$_4$ nanoparticles. The flow inside the enclosure is considered laminar, non-Newtonian, and incompressible. The corrugated cylinder is taken heated. The top and bottom walls of the outer square are considered adiabatic, and the left and right walls are considered cold. Several non-dimensional parameters including the Rayleigh number ($Ra=10^4, 10^5, 10^6$), the Bingham number ($Bn=0, 0.5, 1$), the volume fraction ($\phi=0.00, 0.04$), the Brownian parameter ($Nb=0.1, 0.2, 0.3$), thermophoresis parameter ($Nt=0.1, 0.2, 0.3$), buoyancy ratio ($Nr=0.1, 0.2, 0.3$), corrugation ($N= 5, 6, 7$), the Prandtl number ($Pr=6.2$), and the Lewis number ($Le=1000$) have been numerically simulated. The results show that an upsurge in $Ra$ increases the extent of the upper two vortices and decreases the extent of the lower two vortices. All four vortices are seen to increase in dimension for an increase in $Bn$. The same observation is found for an increase in $\phi$. The lower vortices are growing, and the top ones are nearly eliminated for base fluid, while those are visible for nanofluid when corrugation is increased. A further expansion completely destroyed the higher ones and increased the size of the bottom ones. The average Nusselt number ($\overline{Nu}$) increases when $Ra$ is incremented. $\overline{Nu}$ rises with rise in $\phi$. An increment in $\phi$ to 0.04 results in $4.43\%$ gain in $\overline{Nu}$. An increase in $Bn$ is causing $\overline{Nu}$ to drop by $18.02\%$. For $Ra=10^5$ and $Bn=2$, $\phi=0.02$ has the maximum heat transfer enhancement between $0.00\le\phi\le0.04$

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Section: Introductionmentioning

confidence: 99%

Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Mahmud,

Molla

2024

Phys. Scr.

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“…Ma et al [40] inspected TTs efficacy in the space between a cylinder filled with copper/water-EG. The flow regime was turbulent, and the k − ε turbulence was employed along with SIMPLE approaches According to the results reported by the authors, due to the nanofluid flow through the twisted tubes, the disturbance is generated in the viscous sublayer, resulting in an enhancement in the average Nusselt number (Nu).…”

Section: Introductionmentioning

confidence: 99%

Improvement of the energy and exergy efficiencies of the parabolic solar collector equipped with a twisted turbulator using SWCNT-Cu/water two-phase hybrid nanofluid

Ibrahim

Abidi

Algehyne

et al. 2022

Sustainable Energy Technologies and Assessments

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“…They represented isotherms and streamline contours for the numerical domain, Local and average Nusselt numbers for the various parameters obtained and discussed as well. Maa and Jamiatia [23] studied the free convective flow between several differentially hot and cold tubes enclosed in a space between two horizontal adiabatic coaxial cylinders which filled with three different kinds of nano-fluids are investigated. The effects of influential aspects including; location of heat source/sink, number of tubes, Rayleigh number (Ra), volume concentration and type of the nanoadditives on the isotherms, streamline, stream function and average Nusselt number are explored.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fin Length on Free Convection Heat Transfer in Annular Space of Concentric Arrangement Using Shear-Thinning Fluids as a Thermal Medium

Guendouci

Laidoudi

Bouzit

2021

DDF

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The two-dimensional steady-state natural convection of shear-thinning fluids is studied numerically between two concentric horizontal cylinders with different constant temperatures. The inner cylinder was put eccentrically into the outer one. The inner cylinder are held at constant temperatures with the inner one heated isothermally at temperature (Th) and the outer cylinder have one fin cooled isothermally at temperature Tc (Th > Tc). The simulations have been taken for the parameters 102 ≤ Ra ≤ 104, = 0.71 ≤ Pr ≤ 10 and 0.6 ≤ n ≤1.The effects of Rayleigh number and Prandtl number on the dimensionless velocity and temperature are investigated for both shear-thinning and Newtonian fluids. Also the mean Nusselt number for various values of governing parameters is obtained and discussed. Although huge researches were conducted for natural convection in non-circular enclosures, researches for annular enclosures are very limited, especially finned enclosures. The length of the fin is also studied. The results show that increase in the length of fin increases the effectiveness of heat transfer. Also, the increase in Ra number increases the heat transfer effectiveness.

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Effect of differentially heated tubes on natural convection heat transfer in a space between two adiabatic horizontal concentric cylinders using nano-fluid

Cited by 25 publications

References 55 publications

Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Improvement of the energy and exergy efficiencies of the parabolic solar collector equipped with a twisted turbulator using SWCNT-Cu/water two-phase hybrid nanofluid

The Effect of Fin Length on Free Convection Heat Transfer in Annular Space of Concentric Arrangement Using Shear-Thinning Fluids as a Thermal Medium

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Effect of differentially heated tubes on natural convection heat transfer in a space between two adiabatic horizontal concentric cylinders using nano-fluid

Cited by 25 publications

References 55 publications

Natural convection and heat transmission of two-phase Bingham Fe3O4-CoFe2O4-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Natural convection and heat transmission of two-phase Bingham Fe3O4-CoFe2O4-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Improvement of the energy and exergy efficiencies of the parabolic solar collector equipped with a twisted turbulator using SWCNT-Cu/water two-phase hybrid nanofluid

The Effect of Fin Length on Free Convection Heat Transfer in Annular Space of Concentric Arrangement Using Shear-Thinning Fluids as a Thermal Medium

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Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder

Natural convection and heat transmission of two-phase Bingham Fe₃O₄-CoFe₂O₄-water hybrid nanofluid flow in an enclosure with a corrugated heated cylinder