Natural Convection and Surface Radiation Heat Transfer in a Square Cavity with an Inner Wavy Body

Moutaouakil, Lahcen El; Boukendil, Mohammed; Zrikem, Z.; Abdelbaki, Abdelhalim

doi:10.1007/s10765-020-02688-7

Cited by 25 publications

(4 citation statements)

References 55 publications

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“…The effects of dimensionless time (τ), surface emissivity (ε), Rayleigh number (Ra) and inclination angle of the internal plate (φ) on fluid flow and heat transfer were investigated. The values of the parameters were given as 10 5 ≤ Ra ≤ 10 7 , 0º ≤ φ ≤ 90º, 0 ≤ ε ≤ 1, W/D = 1/8, L/D = 1/2, H/D = 1/2, P r = 0.71, which corresponds to a typical cooling problem [5,[11][12]15]. The reference temperature of air was set as T 0 = (T c + T h )/2 = 303.15 K, and the temperature difference between the cold cylindrical wall and the hot plate surface was kept at a constant value of 20 K, for which the Boussinesq approximation was valid.…”

Section: Resultsmentioning

confidence: 99%

“…Understanding combined natural convection and surface radiation in closed cavities has drawn tremendous interest due to its importance in substantial practical applications, including thermal cycling systems, nuclear reactors, chemical apparatus, data centre cooling, etc. Many of these applications can be simplified into physical models in which both natural convection and surface radiation heat transfer happen in a closed cavity containing or not an internal heat source [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Transient characteristics of coupled thermal radiation and natural convection in a 3-D cylindrical cavity containing a heated plate

Wang¹,

Qiu²,

Liu³

et al. 2023

THERM SCI

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In this study, a numerical study of transient combined natural convection and surface radiation in a cylindrical cavity with a heated plate placed inside is carried out using the open-source platform OpenFOAM. The effects of the Rayleigh number (105 ? Ra ? 107), inclination angle (0? ? ? ? 90?), and surface emissivity (0 ? ? ? 1) on the velocity components, temperature field, and Nusselt number are investigated in detail. Results show that the Rayleigh number has a greater effect on the radiative heat transfer than on natural convection. Radiative heat transfer increases monotonously with the increase of surface emissivity, and its contribution could be over 50% of the total heat transfer rate. The inclination angle of the plate affects the flow structure, but the difference in total Nusselt number is less than 10% for various inclination angles. Results in this study provide insights into the transient characteristics of coupled thermal radiation and natural convection in a three-dimensional cavity and will guide the optimal design of related devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient characteristics of coupled thermal radiation and natural convection in a 3-D cylindrical cavity containing a heated plate

Wang¹,

Qiu²,

Liu³

et al. 2023

THERM SCI

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show abstract

“…In order to manage the interaction between surface radiation and natural convection in the encountered irregular geometries in electronic component cooling, El Moutaouakil et al [13] developed a CFD model employing discrete ordinate approaches with the blocked zone idea. They demonstrated that the mean radius and amplitude of the corrugated wall have more influence on the rate of overall heat transfer than the number of corrugations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Natural Convection in a Cubical Enclosure with Various Protuberance Shapes

Bouguerne,

Rahal,

Brima

et al. 2024

IJHT

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Heat transfer by convection is widely used in many engineering applications such as in heat exchangers, combustion devices or gas processing. In Buildings, the use of rough surfaces allows enhancing heat transfer rates. Practically, in this study, a rough surface is obtained by using protuberances on the vertical left wall. In this perspective, the originality of this research is to study the influence of the protuberance geometric shapes on the heat transfer using 2D numerical simulations as a tool investigation. The homotopic transformation is used to reach a flat plate. The system of equations with the boundary conditions is solved using the finite volume method. A simple algorithm is chosen for the integration of algebraic equations. The governing equations are figured out using ANSYS FLUENT commercial software with SIMPLE algorithm in order to solve pressure-velocity coupling. The numerical simulations have been performed for different shapes of the protuberances (battlement, triangular and sinusoidal). The boundary conditions are based on a uniform heat flux applied to the vertical wall. On the other hand, the horizontal walls are subject to the adiabatic condition. It can be noticed that the effect of the wavy geometry induces a noticeable improvement of the heat transfer rate compared to an enclosure without protuberances. It can also conclude that the wavy configuration exhibits a Nusselt average slightly higher than that of the square cavity, particularly the triangular configuration, by approximately 20%.

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“…Consequently, engineers and researchers need to develop a suitable and less costly cooling system. These electronic devices are modeled as closed cavities (electronic packaging) containing heating bodies (electronic components) 4–8 . The considered problem (natural convection) gets quite complex when several components (heat sources) that generate different amounts of heat are assembled inside the same sealed cabinet.…”

Section: Introductionmentioning

confidence: 99%

Natural convection coupled to surface radiation in an air‐filled square cavity containing two heat‐generating bodies

et al. 2022

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The present numerical study focuses on the cooling by natural convection and surface radiation of two electronic components generating two different and uniform volumetric powers. These components are modeled by two square bodies placed inside a closed square cavity with a cold straight wall. Two configurations are analyzed based on the position of the two heat‐generating bodies. In the first one (horizontal position configuration), the two bodies are located at the same height of the cavity, while they are placed at different heights in the second case (vertical position configuration). The effects of two Rayleigh numbers (0 ≤ ( Ra 1 , Ra 2 ) ≤ 10 6 $0\le ({{Ra}}_{1},{{Ra}}_{2})\le {10}^{6}$), the conductivity ratio (0.01 ≤ K ≤ 100 $0.01\le K\le 100$), and the emissivity (0 ≤ ε ≤ 1 $0\le \varepsilon \le 1$) on the heat transfer characteristics and the flow structure are analyzed. The data is displayed as streamlines, isotherms, velocity, and maximum temperature profiles, and local heat transfer on the active wall. The obtained results indicate that the choice of the appropriate configuration depends mainly on the deviation between the two Rayleigh numbers. Furthermore, the maximum temperature of a specific block decreases as the quantity of heat generated by the other block rises. We can also see that the maximum temperature of the two blocks decreases by about 50 % $50 \% $ with the increase in the emissivity (from 0 $0$ to 1 $1$) or the conductivity ratio (from 0.1 $0.1$ to 1 $1$).

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Natural Convection and Surface Radiation Heat Transfer in a Square Cavity with an Inner Wavy Body

Cited by 25 publications

References 55 publications

Transient characteristics of coupled thermal radiation and natural convection in a 3-D cylindrical cavity containing a heated plate

Transient characteristics of coupled thermal radiation and natural convection in a 3-D cylindrical cavity containing a heated plate

Numerical Investigations of Natural Convection in a Cubical Enclosure with Various Protuberance Shapes

Natural convection coupled to surface radiation in an air‐filled square cavity containing two heat‐generating bodies

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