The effects of discrete conductive blocks on the natural convection in side-heated open cavities

Franco, A.; Santos, Paulo R.M.; Lugarini, Alan; Loyola, Leonardo T.; Lai, Fernando Cesar De; Junqueira, Silvio L. M.; Nardi, Vanessa Glück; Ganzarolli, Marcelo Moreira; Lage, José Luis Caramés

doi:10.1016/j.applthermaleng.2022.119613

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…It can be seen that when A i /A o > 1 is greater than 1, the accuracy of flow rate prediction may be compromised due to its strong dependence on the inlet area, particularly when the inlet area significantly exceeds the outlet area. However, over 80% of the predicted results have an error within 15%, which closely aligns with the fitting results of relevant studies [66,67] and is considered acceptable. Therefore, within their validity conditions these correlations can correctly describe the convective exchange in channel.…”

Section: Middle Channelsupporting

confidence: 84%

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Pu,

Zhu,

et al. 2024

Buildings

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The installation of successional heating devices in industrial buildings will result in thermal corridors. To improve the thermal environment in and around these corridors, buoyancy-driven ventilation is commonly utilized to dissipate heat, which is based on the natural convection design for buildings. However, the flow and heat exchange patterns of natural convection related to thermal corridors have not been clearly clarified, and no relevant correlations have been established to quantify them. The conducted numerical study aimed to analyze the flow and heat transfer characteristics of natural convection within thermal corridors in industrial buildings. Experimental data were utilized to validate a computational fluid dynamics (CFD) model developed for this purpose. The study considered the influence of various parameters on the results obtained. In the side corridor, the prevalence of reverse flow dominates much of the channel, while in the middle corridor, reverse flow near the bottom corner is observed. The ambient air temperature significantly impacts the temperature distribution in both corridors. Increasing the ambient air temperature at the inlet from 22 to 28 °C results in a substantial temperature rise within the corridor, by approximately 6–7 °C. When the outlet size is constant and the inlet size drops by 30%, the air temperature in the corridor increases by 3 °C. Finally, correlations were established based on the simulation data to predict the surface-averaged Nu¯ of the heated wall and the induced mass flow rate, m˙, of the natural convection. The correlations have relative errors of less than 16% when compared to the simulation data.

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Section: Middle Channelsupporting

confidence: 84%

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Pu,

Zhu,

et al. 2024

Buildings

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“…An extended computational domain referring to the reservoir was applied to move the boundary away from the opening. Numerical tests were carried out for the choice of the extended domain; the aim was to relate great results with a good computational time through the boundary conditions imposed on the external reservoir [ 7 , 28 ].. At the boundaries of the extended domain, the terms of velocity, temperature, and pressure are not specified and therefore are considered null [ 7 ].…”

Section: Physical Problem and Mathematical Modelmentioning

confidence: 99%

“…The effect of boundary layer interference is also noticed with block growth. Using a similar geometry, Franco et al [ 28 ] investigate the natural convection process by varying the total number of blocks N within the cavity, the Rayleigh number Ra and the solid-fluid thermal conductivity ratio κ. With the variation of N , they noticed that the blocks affect the convection process in three ways: via channeling, flow interference, and discontinuous fin-shaped diffusion.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of viscoplastic fluids on natural convection in open cavities with solid obstacles

Santos,

Franco,

Junqueira

2024

Heliyon

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“…They investigated the influence of variable magnetic field with the impact of ferrohydrodynamic and MHD and concentration of ferroparticles on natural convective heat transfer. Recently, Franco et al (2023) numerically reported the effect of the HFF 34,2 solid blocks on the naturel convection process inside a side open cavity. The results indicate that a rise in the number of blocks prevents natural convection in the cavity.…”

Section: Hff 342mentioning

confidence: 99%

Baffle effects on enhancing cooling performance of electronic components by nanofluid in a horizontal channel

Armou

Hssain

Nouari

et al. 2023

HFF

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Purpose The purpose of this study is to investigate the impact of varying baffle height and spacing distance on heat transfer and cooling performance of electronic components in a baffled horizontal channel, using a Cu-H2O nanofluid under mixed convection and laminar flow. Design/methodology/approach The mathematical model is two-dimensional and comprises a system of four governing equations, such as the conservation of continuity, momentum and energy. To obtain numerical solutions for these equations, the finite volume method was used for discretization. A validation process was performed by comparing this study’s results with those of previously published studies. The comparison revealed a close agreement. The numerical study was performed for a wide range of key parameters: The baffle height (0 ≤ h ≤ 0.7), the spacing distance between baffle and blocks (0.25 ≤ w ≤ 3), the Grashof and Reynolds numbers are kept equal to 104 and 75, respectively, the channel aspect ratio is L/H = 10, and the volume fraction of Cu nanoparticles is fixed at φ = 5%. Findings The results of the study reveal a significant improvement in heat transfer in terms of total Nusselt number of the top and bottom hot components, which exhibited an improvement of 16.89% and 17.23% when the baffle height increases from h = 0 to h = 0.7. Additionally, the study found that reducing the distance between the baffle and the electronic components up to a certain limit can improve the heat transfer rate. Therefore, the optimal height of the baffle was found to be no lower than 0.6, and the recommended distance between the heaters and the baffle was 0.5. Originality/value This study provides valuable insights into the optimization of the design of baffled channels for improved heat transfer performance. The findings of study can be used to improve heat exchangers and cooling systems in various applications. The use of Cu-H2O nanofluid under mixed convection and laminar flow conditions in channel with baffle and electronic components is also unique, making this study an original contribution to the field.

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The effects of discrete conductive blocks on the natural convection in side-heated open cavities

Cited by 14 publications

References 36 publications

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Numerical investigation of viscoplastic fluids on natural convection in open cavities with solid obstacles

Baffle effects on enhancing cooling performance of electronic components by nanofluid in a horizontal channel

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