Effect of material and geometric parameters on natural convection heat transfer over an eccentric annular-finned tube

Fourar, Issam; Benmachiche, Abdelmoumène Hakim; Abboudi, Saïd

doi:10.1080/01430750.2019.1573757

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…Tey showed that for an inline arrangement, the pressure drop increases with increasing tube diameter, the heat transfer coefcient decreases with increasing tube diameter, and an increase in fn height also causes a signifcant increase in pressure drop but a decrease in heat transfer coefcient. Fourar et al [12] numerically studied the performance of eccentric annular fnned-tube heat exchangers under natural convection conditions and showed that the eccentricity efect is stronger for small-diameter fnned tubes with materials that have high thermal conductivity. Liu et al [13] conducted a numerical study on open-hole corrugated fnned-tube heat exchangers in air conditioners and found that simultaneously optimizing fn spacing and corrugation parameters improved the heat transfer coefcient by 23.4% and opening holes at the top of corrugated fns improved the heat transfer coefcient by 6%.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

Wang,

Li,

Liu

et al. 2023

International Journal of Chemical Engineering

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The finned-tube heat exchanger is the core part of an air conditioning system. Its heat exchange performance directly affects the energy consumption and efficiency of the air conditioner. The shortage and rising price of copper have led to increasing replacement of copper tubes with aluminum tubes in finned-tube heat exchangers. This paper studies two kinds of such heat exchangers, one consisting of copper tubes and aluminum fins and the other consisting of aluminum tubes and aluminum fins. The influences of the different base tube materials on heat transfer are compared and analyzed in terms of heat transfer strength and cost per unit heat transfer. The results show that the heat transfer and heat transfer coefficient increase with increasing inlet wind speed. Under different inlet wind speeds, the heat transfer and heat transfer coefficient of the finned-tube heat exchanger with aluminum tubes are 4%–12% and 7%%–9% lower than those of an identically structured heat exchanger with copper tubes, respectively. The aluminum-aluminum exchanger achieves 67% higher heat transfer than that of the copper-aluminum exchanger at only 8% of the cost. These results are significant for guiding the development and application of finned-tube heat exchangers.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

Wang,

Li,

Liu

et al. 2023

International Journal of Chemical Engineering

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“…A number of studies have used CFD to predict the heat transfer and flow behavior around heated cylinder and to obtain optimum design. Fourar, Benmachiche, and Abboudi [21] presented a CFD simulation to analyze the heat transfer from the horizontal cylinder surrounded by fins. The results displayed that the eccentricity effect is appeared with small fin diameter having high thermal conductivity materials and thick fins produce best heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of convection heat transfer from a horizontal cylinder in a vented square enclosure with variation of lower opening size

2022

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Natural and mixed convection heat transfer from a horizontal cylinder placed in a vented square enclosure has been investigated using numerical method with ANSYS Fluent 16.1 software for laminar and turbulent flow. Navier- Stokes equations and energy equation with standard k-? transport equation turbulence model have been used to simulate both flow and thermal behaviors. The operating conditions covered a range of the Rayleigh number from 103 to 106 and the Richardson number range between 0.1 and 100 at variable sizes of the lower open vent with constant upper opening size. The Nusselt numbers, velocity lines and isotherms are presented to display the flow and thermal behaviors. The results displayed that the average Nusselt number is affected by Rayleigh number, Richardson number, enclosure width and lower opening size. The Nusselt number is enhanced by controlling the lower opening size. The maximum enhancement range for Nusselt number is between 20-85% depending on the Rayleigh number, Richardson number, enclosure width to cylinder diameter, and lower opening size. The velocity lines and isotherms are directly affected by the Rayleigh number, Richardson number, enclosure width to cylinder diameter, and lower opening size.

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“…The flow and thermal fields of natural convection heat transfer in enclosed cylinders have been a subject of interest, because of their wide engineering applications such as in electronic components cooling, solar collectors, insulation of the aircraft cabin, systems of the thermal storage, and nuclear reactors cooling systems [1]. There are many studies that deal with the enhancement of the heat transfer from single cylinder using different methods such as the influence of fins arrangements, geometrics, dimensions and numbers [2], material, and geometric parameters effect [3], and using different mediums surrounded the cylinder such as porous media [4], nanofluid [5][6][7][8][9] non-Newtonian fluid [10]. Experimental results showed the enhancement of heat transfer from the horizontal cylinder by situating it between two vertical walls or inside a vented enclosure [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Horizontal Spacing on Natural Convection Heat Transfer from Two Aligned Horizontal Cylinders in a Vented Enclosure

Ali

2021

Arab J Sci Eng

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Natural convection heat transfer from horizontally aligned two heated cylinders placed inside a square vented enclosure has been investigated numerically for laminar flow. The Navier-Stokes equations and energy equations have been employed to simulate the flow and thermal behaviors with a finite volume (SIMPLE) method to represent and evaluate the partial differential equations in the form of algebraic equations using ANSYS-FLUENT 16.1 Package. The study has employed a range of Rayleigh numbers from 10 3 to 10 7 with the variation of horizontal spacing between two cylinders and symmetrical open vent size with constant enclosure width. The results displayed that the average Nusselt number is increased with the increase of the Rayleigh number, spacing between cylinders, and opening size. The maximum enhancement range for average Nu is between 50 and 100% for low Ra and 20-30% for high Ra with full opening size and large spacing size. The variation of the local Nusselt numbers, streamlines, and isotherms displayed the effect of the Rayleigh number, opening size, and spacing between cylinders on the flow and thermal behaviors.

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Effect of material and geometric parameters on natural convection heat transfer over an eccentric annular-finned tube

Cited by 7 publications

References 24 publications

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes

Augmentation of convection heat transfer from a horizontal cylinder in a vented square enclosure with variation of lower opening size

Effect of Horizontal Spacing on Natural Convection Heat Transfer from Two Aligned Horizontal Cylinders in a Vented Enclosure

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