Turbulent natural convection in an enclosure with localized heating from below

Sharma, Anil Kumar; Velusamy, K.; Balaji, C.

doi:10.1016/j.ijthermalsci.2007.01.010

Cited by 49 publications

(22 citation statements)

References 11 publications

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“…Their findings indicated that gas radiation had a little influence on the flow structure, at least when considered alone (without wall radiation). The work of Sharma et al [18] was devoted to the turbulent thermogravitational convection in a rectangular enclosure with symmetrical cooling from the vertical side walls and localized heating from below. It should be noted that correlations have been Energies 2019, 12, 980 3 of 14 developed to evaluate the Nusselt number in terms of the Rayleigh number and the heated width.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element

2019

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Low-power electronic devices are suitably cooled by thermogravitational convection and radiation. The use of modern methods of computational mechanics makes it possible to develop efficient passive cooling systems. The present work deals with the numerical study of radiative-convective heat transfer in enclosure with a heat-generating source such as an electronic chip. The governing unsteady Reynolds-averaged Navier-Stokes (URANS) equations were solved using the finite difference method. Numerical results for the stream function-vorticity formulation are shown in the form of isotherm and streamline plots and average Nusselt numbers. The influence of the relevant parameters such as the Ostrogradsky number, surface emissivity, and the Rayleigh number on fluid flow characteristics and thermal transmission are investigated in detail. The comparative assessment clearly emphasizes the effect of surface radiation on the overall energy balance and leads to change the mean temperature inside the heat generating element. The results of the present study can be applied to the design of passive cooling systems.

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Section: Introductionmentioning

confidence: 99%

The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element

2019

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“…Moreover, only limited attention has been paid to the study of the turbulent flow by using advanced models such as LES [14] or URANS [15][16][17][18][19]. Sharma, et al [19] investigated numerically a 2D turbulent free convection in a closed cavity that was heated from the centre of the bottom wall and has a cooled sidewalls and adiabatic other walls. The standard k-ε model was utilized to model the turbulent natural convection.…”

Section: Introductionmentioning

confidence: 99%

Unsteady simulations of mixed convection heat transfer in a 3D closed lid-driven cavity

Kareem

Gao

Ahmed

2016

International Journal of Heat and Mass Transfer

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Unsteady mixed convection heat transfer in a 3D closed cavity with constant heat flux on the centre part of the bottom wall and isothermal sidewalls moving in the same vertical direction is investigated numerically in this research. The other remaining walls forming the geometry are kept stationary and adiabatic. This research is accomplished with different Reynolds number, Re = 5000, 10000, 15000 and 30000. Numerical methodology based on the finite volume method is utilized. The simulations and analysis have been carried out by evaluating the performance of two turbulence methods, Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large Eddy Simulation (LES), in terms of flow vectors, isotherm contours, turbulent kinetic energy, the average Nusselt number (Nuav) and the local Nusselt (Nulocal) number along the hot part of the bottom wall. The results show that by increasing the Reynolds number leads to enhanced Nusselt number and turbulent kinetic energy of the fluid in the domain. Moreover, both LES and URANS solutions captured the existence of the two primary vortexes (clockwise and anticlockwise). However, the comparisons have demonstrated clearly the ability and accuracy of the LES method in predicting the secondary vortexes in the corners of the cavity.

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“…While the other walls were insulated, the vertical side walls were kept at a uniform low l L (a) (b) (c) temperature. Sharma et al [14] reported numerical results of turbulent natural convection in a square enclosure with localized heating from below and symmetrical cooling of two vertical side walls. Their study pretended to simulate accidental heat generation due to fire.…”

Section: Introductionmentioning

confidence: 99%

Laminar natural convection heat transfer and air flow in three-dimensional cubic enclosures with a partially heated wall

Mellah

Ben–Cheikh

Ben-Beya

et al. 2015

J Appl Mech Tech Phy

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In the present study, a finite volume computational procedure and a full multigrid technique are used to investigate laminar natural convection in partially heated cubic enclosures. Effects of heated strip disposition in the enclosure on the heat transfer rate are studied. Results are presented in the form of flow lines, isotherms plots, average Nusselt numbers, and average temperature on the heat source surface. Statistical distributions of temperature and average velocity fields and their root-mean-square values are presented and discussed.

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Turbulent natural convection in an enclosure with localized heating from below

Cited by 49 publications

References 11 publications

The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element

The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element

Unsteady simulations of mixed convection heat transfer in a 3D closed lid-driven cavity

Laminar natural convection heat transfer and air flow in three-dimensional cubic enclosures with a partially heated wall

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