3D Numerical study of the effect of aspect ratio on mixed convection air flow in upward solar air heater

Boulemtafes-Boukadoum, A.; Abid, C.; Boutarfaïa, Ahmed

doi:10.1016/j.ijheatfluidflow.2020.108570

Cited by 19 publications

(5 citation statements)

References 39 publications

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“…Reducing the height of the channel can stabilize the flow. Nusselt shows large fluctuations and increases with the height of the channel [11].…”

Section: Airflow Types Used In Solar Air Heaters To Enhance Performancesmentioning

confidence: 99%

Better Efficiencies of Solar Air Heaters Achieved With Different Airflows - A Brief Review -

IFRIM,

POP

2024

JESR

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The use of solar air heater systems brings with it the convenience of having hot air at discretion for heating households with quite low prices compared to the use of conventional heating sources. The researchers desire to achieve the highest thermal efficiency of these systems has led to the emergence of different ways of improvement. The present work is focused on the available literature in the field of SAH systems made with different types of air flow. The paper also presents the different designs for the realization of airflow types used by researchers for high efficiency during the years 2017-2021.

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“…Reducing the height of the channel can stabilize the flow. Nusselt shows large fluctuations and increases with the height of the channel [11].…”

Section: Airflow Types Used In Solar Air Heaters To Enhance Performancesmentioning

confidence: 99%

Better Efficiencies of Solar Air Heaters Achieved With Different Airflows - A Brief Review -

IFRIM,

POP

2024

JESR

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“…Due to the complexity of modern problems and the need for a complete understanding of all processes occurring in the studied areas, it is necessary to conduct numerical studies as accurately and in as much detail as possible. As a result, special attention should be paid to the numerical modeling of mixed convection problems in spatial objects [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…That is why such works are the most valuable, but they are carried out much less. Thus, Boulemtafes-Boukadouma et al [27] have investigated the effect of the channel height on the mixed convection in a solar collector. Constant heat flux was applied to the lower plate range of 200 to 1000 W/m 2 , and the Reynolds number was also varied from 50 to 1000.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Conjugate Mixed Convection in 3D Channel with Heat-Generating Flat Element and Symmetrical Solid Two-Fin System

Gibanov

Sheremet

2023

Symmetry

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This paper presents the numerical simulation results of conjugate mixed convection in a three-dimensional channel with a heat-generating element and solid fins. It should be noted that the symmetrical location of fins has been studied. The system of partial differential equations, presented in dimensionless form using velocity and vorticity vectors, has been solved by the finite difference method on a uniform grid. The central difference schemes have been used to approximate diffusive terms. In contrast, for an approximation of convective terms, the monotonic Samarskii difference schemes have been applied to improve the stable properties of central differences of the second order of accuracy. Analysis has been performed on a wide range of governing parameters, including the Reynolds number (200 ≤ Re ≤ 1000), the material of the fins (aluminum, copper, and iron), and the location of the fins on the heater surface, taking into account the identical distances between the fins and the nearest walls. Water has been considered a working cooling medium. The obtained outcomes characterize the most efficient heat removal from the surface of the energy source using the considered fin system. For example, by using copper fins, the cooling efficiency of the heating element can be increased. The average heater temperature decreases significantly with an increase in the Reynolds number. The distance between the fins also makes a significant contribution to the cooling phenomenon. It is noted that with the most successful choice of location, it is possible to decrease the temperature of the heater by more than 12%.

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“…Therefore, scholars have conducted in-depth studies on heat transfer characteristics. Boulemtafes Boukadoum et al [4] found that the heat transfer in the solar air heater can be enhanced or weakened, depending on the aspect ratio. Taher et al [5] established a heat transfer correlation of Nusselt number in the fully developed zone of longitudinal roll of normal temperature water through experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

Zhu,

Wan,

2023

Preprint

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A series of three-dimensional numerical simulations of Poiseuille-Rayleigh-Benard (P-R-B) convection of cold water with different aspect ratios were carried out by using the finite volume method. The results indicate that the flow weakens gradually as the density inversion parameter increases, indicating that the density inversion parameter has a suppression effect on secondary flow. The average Nusselt number in the fully developed region increases with the increasing Rayleigh number and aspect ratio and the decreasing density inversion parameter. Based on the calculation results, a heat transfer correlation for the fully developed region of P-R-B convection was obtained.

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3D Numerical study of the effect of aspect ratio on mixed convection air flow in upward solar air heater

Cited by 19 publications

References 39 publications

Better Efficiencies of Solar Air Heaters Achieved With Different Airflows - A Brief Review -

Better Efficiencies of Solar Air Heaters Achieved With Different Airflows - A Brief Review -

Numerical Simulation of Conjugate Mixed Convection in 3D Channel with Heat-Generating Flat Element and Symmetrical Solid Two-Fin System

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

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