Coupled natural convection heat transfer inside and outside a closed cylindrical cavity with a uniform temperature heat source

Zhang, Li; Chen, Chen; Li, You-Rong

doi:10.1016/j.csite.2023.103659

Case Studies in Thermal Engineering

2023

DOI: 10.1016/j.csite.2023.103659

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Coupled natural convection heat transfer inside and outside a closed cylindrical cavity with a uniform temperature heat source

Li Zhang,

Chen Chen,

You-Rong Li

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Cited by 3 publications

References 25 publications

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Characteristics of natural convection heat transfer in composite cavity

Lei,

Zhu,

Qiu

et al. 2024

Case Studies in Thermal Engineering

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Characteristics of natural convection heat transfer in composite cavity

Lei,

Zhu,

Qiu

et al. 2024

Case Studies in Thermal Engineering

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Entropy generation analysis of MHD convection flow of hybrid nanofluid in a wavy enclosure with heat generation and thermal radiation

Hussain,

Parveen,

Katbar

et al. 2024

Reviews on Advanced Materials Science

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This work examines the behaviour of flow and heat transmission in the presence of hybrid nanofluid in thermal radiation, heat generation, and magnetohydrodynamics. The hybrid state in this model is represented by two different fluids, TiO2 (titanium dioxide) and Ag (silver). The enclosure is wavy and slanted, with curving walls on the left and right. The finite difference approximation method was utilized to resolve the fundamental equations after they were non-dimensionalized, which are further reduced to a fourth-order bi-harmonic equation and are numerically solved based on the biconjugate gradient-stabilized approach method. The simulations are performed with various Rayleigh numbers, Hartmann numbers, an inclination angle of the enclosure, radiation parameters, heat generation parameters, inclination angle of the magnetic field, and volume fraction of hybrid nanoparticles. The streamlines, isotherms, and average Nusselt number contours are used to depict the thermo-fluid patterns. The findings show that the average Nusselt number relies on ϕ and increases as ϕ rises. The investigation’s findings demonstrated that the transfer of heat on the heated bottom wall significantly increases with the Rayleigh number (Ra = 105 and 106). At a cavity inclination of 45°, interesting multi-vortex structures are observed. The results of this study may enhance the effectiveness of solar collectors, heat exchangers, and other similar systems that depend on convective heat transfer in nature.

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Numerical Study of Heat Transfer in a Differentially Heated Cavity

Konfe,

Sanembaye,

Bayala

et al. 2023

EPE

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Laminar natural convection is studied in a square cavity filled with air whose two vertical sides are subject to a temperature difference, while the other two horizontal sides are adiabatic. The hot and cold wall temperatures are kept constant. We have presented a dynamic and thermal study of pure natural convection for different values of the Rayleigh number. The numerical simulation was carried out for Rayleigh numbers ranging from 10 2 , 10 3 , …, 10 5 and the Prandtl number is Pr = 0.71. We used the COMSOL Multiphysic 5.1 software, which allows us to simultaneously solve the coupled physical phenomena in a square enclosure containing air under the Boussinesq approximation. For the coupling of natural convection with radiation from radiative surfaces, both horizontal faces are subjected to radiative flux, and the emissivity of the surfaces varies from Ԑ = 0.1 to 0.8. We have seen that a circulation process is involved. The fluid that is subjected to a high temperature near the hot wall rises to the ceiling and the fluid near the cold wall sinks. This movement continues until the fluid reaches thermal equilibrium. In a natural convection-surface radiation coupling, simulation results indicate that radiative exchange decreases as a function of the Rayleigh number. Surface radiation reduces the flow in the cavity.

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Coupled natural convection heat transfer inside and outside a closed cylindrical cavity with a uniform temperature heat source

Cited by 3 publications

References 25 publications

Characteristics of natural convection heat transfer in composite cavity

Characteristics of natural convection heat transfer in composite cavity

Entropy generation analysis of MHD convection flow of hybrid nanofluid in a wavy enclosure with heat generation and thermal radiation

Numerical Study of Heat Transfer in a Differentially Heated Cavity

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