Natural Convection and Irreversibility Evaluation in a Cubic Cavity with Partial Opening in Both Top and Bottom Sides

Öztop, Hakan F.; Almeshaal, Mohammed A.; Kolsi, Lioua; Rashidi, Majid; Ali, Mohamed

doi:10.3390/e21020116

Cited by 17 publications

(9 citation statements)

References 34 publications

(36 reference statements)

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“…Oztop et al [7] have used finite volume method in order to perform three-dimensional computational analysis of entropy generation due to natural convection in partially open enclosure. The study has been performed for different governing parameters such as opening ratio 0.…”

Section: The State Of the Art And Objectives Of This Studymentioning

confidence: 99%

Experimental Correlations Nu vs Gr.Pr at Varying Widths for Convective Heat Flow Through a Large Aperture in a Full Scale Enclosed Space

Youcef¹,

Belaïdi²

2021

IJHT

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Convective heat transfer through a large aperture has been studied theoretically and experimentally using reduced scale models for many years. This paper describes the effect of the width of a large opening on the convective heat flow in an enclosure for 5.6×108< Rayleigh number (Ra)<2.8×1010. In our case a full scale realistic calorimetric chamber (5.5m x 2.5m x 2.5m) was used in this study. This chamber contains two zones connected by a large aperture of height H. A hot and cold wall on each side of the aperture will create a temperature difference between the two zones. Empirical equations are expressed in terms of varying door aspect ratio ADS, i.e.: NuPr=(α+βWH)∗Grb, at various temperature differences between the two zones. It was clearly found that as the width decreases the convective flux increases substantially. The instability of the air flow due to the apparition of a small turbulence increased when the opening width gets larger. It was also noticed that the neutral axis (air velocity = 0) goes up when the width of the opening decreases resulting in an acceleration of the air flow above the neutral axis. The liability of these experimental results could be useful for the validation of simulation models.

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Section: The State Of the Art And Objectives Of This Studymentioning

confidence: 99%

Experimental Correlations Nu vs Gr.Pr at Varying Widths for Convective Heat Flow Through a Large Aperture in a Full Scale Enclosed Space

Youcef¹,

Belaïdi²

2021

IJHT

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“…The local entropy generation per unit area can be expressed by two quantities. That is, the local entropy generation subject to heat transference and due to fluid friction [ 24 , 25 , 26 , 27 , 28 ].

…”

Section: Entropy Generation Analysismentioning

confidence: 99%

“…It is an essential aspect of the 2nd law of thermodynamics [ 21 , 22 ]. The study of entropy generation in closed domain has been analyzed in several studies [ 23 , 24 , 25 ]. Ahmed et al [ 26 ] analyzed the entropy production due to doubly diffusive convection of Casson liquids in the occurrence of slip boundaries and chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Convection and Thermal Radiation of Casson Fluid in an Enclosure with Entropy Generation

Alzahrani

Sivasankaran

Bhuvaneswari

2020

Entropy

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The goal of the current numerical simulation is to explore the impact of aspect ratio, thermal radiation, and entropy generation on buoyant induced convection in a rectangular box filled with Casson fluid. The vertical boundaries of the box are maintained with different constant thermal distribution. Thermal insulation is executed on horizontal boundaries. The solution is obtained by a finite volume-based iterative method. The results are explored over a range of radiation parameter, Casson fluid parameter, aspect ratio, and Grashof number. The impact of entropy generation is also examined in detail. Thermal stratification occurs for greater values of Casson liquid parameters in the presence of radiation. The kinetic energy grows on rising the values of Casson liquid and radiation parameters. The thermal energy transport declines on growing the values of radiation parameter and it enhances on rising the Casson fluid parameter.

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“…Several works dealing with quantification of heat transfer by free convection have been carried out in both variable regime and steady state. Different fluids and flow regimes have been examined for cavities or spaces of various shapes [1][2][3][4][5][6]. The hemispherical geometry has been treated recently with experimental and numerical approaches, applied to some engineering fields, such as buildings and renewable energy.…”

Section: Introductionmentioning

confidence: 99%

Free Convective Heat Transfer in a Closed Gap between Concentric Semi-Hemispheres

et al. 2021

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Free convective heat transfer in the closed gap between concentric semi-hemispheres is quantified by means of a numerical approach based on the volume control method using the SIMPLE algorithm. The average Nusselt number is determined for several configurations obtained by varying the cavity’s aspect ratio between 0.15 and 1.5, while the Rayleigh number varies within the 5.33 × 103–4.50 × 108 range. The results show that the correlations available in the literature dealing with concentric whole spheres cannot be used for the configuration treated here. The new correlation between the Nusselt and Rayleigh numbers proposed in this work can be applied in various engineering sectors, such as in the electronic packaging considered in this present work, buildings, and architecture.

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Natural Convection and Irreversibility Evaluation in a Cubic Cavity with Partial Opening in Both Top and Bottom Sides

Cited by 17 publications

References 34 publications

Experimental Correlations Nu vs Gr.Pr at Varying Widths for Convective Heat Flow Through a Large Aperture in a Full Scale Enclosed Space

Experimental Correlations Nu vs Gr.Pr at Varying Widths for Convective Heat Flow Through a Large Aperture in a Full Scale Enclosed Space

Numerical Simulation on Convection and Thermal Radiation of Casson Fluid in an Enclosure with Entropy Generation

Free Convective Heat Transfer in a Closed Gap between Concentric Semi-Hemispheres

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