Influence of the variable thermophysical properties on the turbulent buoyancy-driven airflow inside open square cavities

Parra, Blas Zamora; Kaiser, Antonio Sánchez

doi:10.1007/s00231-011-0838-0

Cited by 21 publications

(5 citation statements)

References 31 publications

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“…Based on the effectiveness of temperature distribution, they concluded that the best position for the air outlet gap was at the right side of the upper horizontal wall. Zamora and Kaiser (2012) investigated numerically the influence of the air variable properties on the buoyancy-driven flow of ventilated square cavities. Three walls of the cavity were adiabatic and the vertical left wall was considered with two conditions: a constant wall temperature and a uniform heat flux.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of convective heat transfer in a ventilated rectangular cavity

Macías-Melo

Aguilar-Castro

Xamán

et al. 2018

Journal of Building Physics

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This work presents the design, construction, and evaluation of a rectangular ventilated cavity. The cavity has a heated wall, a fixed air inlet port, and an air outlet port that can change in four different configurations: C-1, the outlet gap is on the upper side of the left wall; C-2, the outlet is on left of the top wall; C-3, the outlet is in the middle of the top wall; and C-4, the outlet is on right of the top wall of the cavity. The experimental tests were carried out with a heating power of 200 and 400 W. The measured indoor air temperatures in nine points, the wall surface temperatures, and heat flows are reported for validation of computer codes. Then, the numerical modeling for the ventilated cavity was done with an in-house code based on the finite volume method to show the relevance of the experimental data. From experimental result for a heating power of 400 W, the configuration C-4 presented the smallest air temperature increment of 3.3°C and the lower average indoor air temperature. In addition, configuration C-4 was more efficient to remove heat than the other configurations, with a maximum percentage of heat removed being 4.75%, 4.32%, and 2.11% more than configurations C-1, C-2, and C-3, respectively. From the validation, the maximum error was 9.9% and 11.5% for the test of 400 and 200 W, respectively. In general, most comparison points had an error smaller than 5%. From both comparisons, it can be concluded that numerical results have an acceptable quantitative approximation.

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Section: Introductionmentioning

confidence: 99%

Experimental study of convective heat transfer in a ventilated rectangular cavity

Macías-Melo

Aguilar-Castro

Xamán

et al. 2018

Journal of Building Physics

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“…These devices provide potential mechanism to reduce environmental impact of greenhouse-gas emissions (Chan et al, 2010;Zamora and Kaiser, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Sustainable design based on passive solar technique reduces annual heating demand by 25% (Liu and Feng, 2012) through the use of various architectural instrumentality such as solar chimneys (Asnaghi and Ladjevardi, 2012), solar roofs (Fiaschi and Bertolli, 2012), solar walls (Albanese et al, 2012; Kundakci Koyunbaba and Yilmaz, 2012; Quesada et al, 2012) and many others. These devices provide potential mechanism to reduce environmental impact of greenhouse-gas emissions (Chan et al, 2010; Zamora and Kaiser, 2012).…”

Section: Introductionmentioning

confidence: 99%

A state of the art review of solar walls: Concepts and applications

Saadatian

Haw

Sopian

et al. 2013

Journal of Building Physics

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Sustainable energy system design offers credible and innovative strategies to overcome environmental energy crises. Solar walls offer feasible technique for the exploitation of directional flow of heat in buildings. This article reviewed state-of-the-art concepts, applications and significance of solar walls for energy savings in buildings. Detailed operational framework of various solar-wall configurations, technology and efficiency as building component was discussed. Need for this sustainable energy design in buildings and constraints associated with their realisation were reported to aid proposed future research work.

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“…Thereby, these heat and concentration gradients are considered to assist or oppose the performance of a system, depending on the boundary conditions of a problem. Many researchers tried to analyze extensively solutions on the heat transfer flow within closed or open cavities [10][11][12][13][14][15][16][17]. Some studies used heat flux or temperature gradient fields to the cavity walls as boundary conditions [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Moist Air Flow Analysis in an Open Enclosure. Part A: Parametric Study

Chati

Rahmani

Naas

et al. 2021

Eng. Technol. Appl. Sci. Res.

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Heat and mass transfer in many systems are widely accomplished applying natural convection process due to their low cost, reliability, and easy support. Typical applications include different mechanisms in various fields such as (solar energy, solar distiller, stream cooling, etc…). Numerical results of turbulent natural convection and mass transfer in an open enclosure for different aspect ratios (AR = 0.5, 1, and 2) with a humid-air are carried out. Mass fraction and local Nusselt number were proposed to investigate the heat and mass transfer. A heat flux boundary conditions were subjected to the lateral walls and the bottom one make as an adiabatic wall, while the top area was proposed as a free surface. Effect of Rayleigh numbers (106≤????????≤108) on natural convection and mass flow behavior are analyzed. The governing equations are solved using CFD Fluent code based on the SIMPLE algorithm. The results showed that the cavity with an aspect ratio of AR = 2 has a significant enhancement to raise the rates of both heat and mass transfer. When the Rayleigh number increases, maximum heat transfer rates were observed due to the fluid flow becomes more vigorous. However, mass transfer improves as the Rayleigh number decreases.

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Influence of the variable thermophysical properties on the turbulent buoyancy-driven airflow inside open square cavities

Cited by 21 publications

References 31 publications

Experimental study of convective heat transfer in a ventilated rectangular cavity

Experimental study of convective heat transfer in a ventilated rectangular cavity

A state of the art review of solar walls: Concepts and applications

Moist Air Flow Analysis in an Open Enclosure. Part A: Parametric Study

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