3D numerical study of natural convection heat transfer from a hollow horizontal cylinder placed on the ground

Dash, Manoj Kumar; Dash, Sukanta Kumar

doi:10.1016/j.ijthermalsci.2019.03.015

Cited by 30 publications

(4 citation statements)

References 22 publications

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“…The inline holed cylinder has less magnitude of

Nu

than the staggered holed cylinder case. Dash and Dash 23 have carried out a 3D numerical simulation using the FVM to study the free convective heat transfer characteristics in a hollow cylinder kept horizontally on the ground. The fluid considered is air, and the flow is considered laminar with a range of Rayleigh numbers of

10^{4} - 10^{8}

.…”

Section: Introductionmentioning

confidence: 99%

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

et al. 2022

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The present numerical study reports the combined effect of natural convection and radiation heat from a vertical cylinder with annular fins. The study involves simulation for laminar as well as turbulent regimes. For the present study, Rayleigh's number is varied in the range 108−1012, emissivity in the range 0.2−0.8, and the fin spacing ratio (s/d) in the range 0.1−10. The radiation heat transfer has been found to share a considerable amount in the total heat transfer of the system for the laminar regime, but in the turbulent regime, its effect is minimal and can be neglected. When the fin spacing ratio is reduced, the total heat transfer increases for both the turbulent and laminar flow conditions. But the radiation heat increases with a reduction in fin spacing ratio for laminar and in case of turbulent flow radiation heat rate reduces with a reduction in s/d ratio. For the range of Rayleigh numbers considered in the present study, the Nusselt number increases with the increment of the fin spacing ratio. Thus, it can be concluded that there is a remarkable enhancement in the heat transfer rate in laminar cases with the fins. For turbulent cases, the fin efficiency lies between 40% and 50%.

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“…The inline holed cylinder has less magnitude of

Nu

10^{4} - 10^{8}

.…”

Section: Introductionmentioning

confidence: 99%

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

et al. 2022

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“…Indeed, many experimental and numerical studies have been accomplished to analyze and determine quantitatively the rate of natural-convection heat transfer between two concentric cylinders [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Mack and Bishop [1] they performed the earlier study of natural-convection between two horizontal concentric cylinders of circular cross-sectional shape.…”

Section: Introductionmentioning

confidence: 99%

“…The work studied the effects of small square number and their arrangement, Rayleigh number on hydrodynamic and thermal behaviors. Dash and Dash [12] studied in 3-D the natural-convection from a thick hollow horizontal cylinder placed at the bottom of block which has a rectangular cross-section. The study is affected by varying the thermophysic parameters, Rayleigh number, and the geometrical dimensions (length of cylinder diameter, the thickness).…”

Section: Introductionmentioning

confidence: 99%

Natural-convection of Newtonian fluids between two concentric cylinders of a special cross-sectional form

et al. 2021

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In this paper, we performed a numerical simulation of natural convection of Newtonian fluids between two cylinders of different cross-sectional form. The inner cylinder is supposed to be hot and the outer cylinder is assumed to be cold. The diameter of inner cylinder to the diameter of outer cylinder defines the radii ratio (RR= 2.5). The governing equations describing the physical behavior of fluid flow and heat transfer are solved using finite volume method. The effects of Prandtl number (Pr = 0.71 to 100), Rayleigh number (Ra = 103 to 105) and inclination angle of inner cylinder (? = 0? to 80?) on streamlines, isotherms and dimensionless velocity are presented and discussed. Also, the mean average Nusselt number of inner cylinder is plotted versus the governing parameters. All present simulations are considered in two-dimensions for steady laminar flow regime. The obtained results showed that the flow between cylinders is more stable for the inclination angle ? = 0?. Increase in Rayleigh number increases the heat transfer rate for all values of inclination angle. Furthermore, the effect of Prandtl number on the mean average Nusselt number becomes negligible when Pr is over the value 7.01. For example at Pr = 0.71 and Ra =105, increase in inclination from 0? to 40?decreases the average Nusselt number by 5.4%. A new correlation is also provided to describe the average Nusselt number as function of Pr and Ra at ? = 0?.

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“…An approximate analytical solution has also been performed in their study. Laminar natural convection from a thick hollow horizontal cylinder placed on ground has been numerically investigated by Dash and Dash [8] by varying the length to outer diameter ratio (L/D) and inner to outer diameter ratio (d/D) in the range from 0.2-20 and 0.4-0.9, respectively. In their study, the average Nu was found to decrease with increase in thickness of the hollow cylinder at low L/D whereas, it was found to increase at higher L/D.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of laminar and turbulent natural convection from a stack of solid horizontal cylinders

Rath

Dash

2020

International Journal of Thermal Sciences

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Natural convection from a stack of isothermal solid horizontal cylinders has been investigated numerically in a three dimensional computational domain. Simulations were conducted in both laminar and turbulent flow regimes of Rayleigh number (Ra) spanning in the range (10 4 ≤Ra≤10 8 ) and(10 10 ≤Ra≤10 13 ), respectively. In the present study, the length to diameter ratio of the cylinders has been varied in the range 0.5 to 20. Three different stack arrangements were considered for the numerical simulations by arranging three, six and ten number of cylinders in a triangular manner. The present computational study is able to appraise very interesting thermo-buoyant plume structures around the stack of cylinders. The average Nusselt number (Nu) shows a positive dependence on Ra for all L/D. The average Nu for a stack of three-cylinders is marginally higher than that of six-cylinders followed by ten-cylinders. Furthermore, at a particular Ra, Nu is significantly higher for short cylinders (low L/D) and decreases with increase in L/D up to 10 or 15 and remain constant for long cylinders.In addition, the present numerical results are also compared with the stack of hollow cylinders. A new Nusselt number correlation has been developed for different stacks as a function of Ra and L/D, which would be useful to industrial practitioners and academic researchers.

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3D numerical study of natural convection heat transfer from a hollow horizontal cylinder placed on the ground

Cited by 30 publications

References 22 publications

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

Natural-convection of Newtonian fluids between two concentric cylinders of a special cross-sectional form

Numerical study of laminar and turbulent natural convection from a stack of solid horizontal cylinders

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