Natural convection in enclosures with localized heating from below and symmetrical cooling from sides

Aydın, Orhan; Yang, Wen‐Jei

doi:10.1108/09615530010338196

Cited by 179 publications

(98 citation statements)

References 16 publications

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“…In particular the very interesting problem is natural convection produced by a localized heat source. In technological processes such flows are commonly observed in heat exchangers, cooling systems of modern electronic equipment and nuclear reactors [1,2]. Concerning atmospheric boundary layer some studies were motivated by processes of impurity propagation from a strong thermal source (for example oil ignition) [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of geometrical parameters on convective flows in non-uniformly heated cylindrical fluid layers

Evgrafova

Sukhanovskii

Kuchinskii

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Convection in a fluid layer with a free surface in a cylindrical container nonhomogeneously heated from below was studied experimentally. The heater has a circular form and was placed in the center of the vessel. Such a system in the presents of rotation is very promising for studying the nature of tropical cyclones. In current paper we considered the influence of different geometric parameters on the dynamics of convection flows. For it two experimental setups of different sizes were used. Measurements were done for fluids with different values of Prandtl number and heating powers. It was shown that the structure and intensity of mean flow producing by a horizontal temperature gradient are defined by Rayleigh number Ra. The basic flow leads to unstable temperature stratification over the heating area and the formation of a system of secondary flows. The formation of secondary flows depends on characteristics of thermal boundary layer and is described by local Rayleigh number Ra δ .

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Section: Introductionmentioning

confidence: 99%

Influence of geometrical parameters on convective flows in non-uniformly heated cylindrical fluid layers

Evgrafova

Sukhanovskii

Kuchinskii

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In their work, which was complemented by experiments, a constant temperature heated strip of fixed width was placed on the bottom wall of the enclosure. (Aydin and Yang, 2000) simulated numerically the natural convection heat transfer of air in a two-dimensional, square enclosure with localized heating applied by a strip placed at the bottom wall center and symmetric cooling from the side walls. Their analysis included the influence of the heated strip width and Rayleigh number on the fluid flow and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Method for Natural Convection Flows in a Full Scale Cavity Heated from Below

Abouricha¹,

Alami²,

Kriraa³

et al. 2017

AJHMT

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In this work, we use the lattice Boltzmann method (LBM) to simulate High Rayleigh number natural convection flows in a cavity filled with air and heated from below. One of the vertical walls has a cold portion, while the other walls are adiabatic. This cavity simulates a living space with under-floor heating and fitted with a glass door (single glass). Computations are made in two dimensions for high values of Rayleigh number. The model uses the double populations approach to simulate hydrodynamic and thermal fields. The traditional LBM with a non-uniform grid has high grid requirements at higher Rayleigh number values. The results are presented in terms of streamlines and isotherms. Variation of the local Nusselt number on the walls is shown and discussed. Global heat transfer has been studied in terms of average Nusselt number which is correlated with Rayleigh number. Dimensionless profiles of temperature and velocity along the vertical and horizontal centerline are illustrated.

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“…Four different stable convective structures were recognized. Orhan Aydin and Wen-jei Yang [7] studied natural convection in a two-dimensional rectangular enclosure with localized heating from below and symmetrical cooling from the sides. Four dimensionless heat source length of 1/5, 2/5, 3/5, 4/5 were taken for numerical simulation at Ra from 10 3 to 10 6 .…”

Section: Introductionmentioning

confidence: 99%

Contaminant spreading by natural convection in a box

Tran

Thang²,

Thuy

2016

Vietnam J. Mech.

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Abstract. In this paper the spreading of a contaminant accompanied with natural convection in a box is numerically simulated. The box may be considered as a cooking room or a working place where some sources of heat and contaminant are in the simultaneous action. The box floor is supposed to be divided into several domains with different boundary conditions for temperature or heat flux. Here the purpose of the simulation is to understand the contaminant spreading process in the box under the influence of a convective motion. The model can be also applied for an enclosure with separated parts differentially heated by the sunlight on its boundaries. A good knowledge of this process is very useful for setting an efficient ventilation scheme. In this paper the finite difference method based on the Samarski scheme with ADI technique is applied for numerical simulation. Here the box floor is divided into two domains of equal sizes but with different temperature or heat flux. The contaminant source locates in the middle of the box bottom. The simulation shows that over the part of the floor where temperature or heat flux is greater the contaminant concentration is lager. That result is in the accordance with the experiment done in the framework of this investigation.

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Natural convection in enclosures with localized heating from below and symmetrical cooling from sides

Cited by 179 publications

References 16 publications

Influence of geometrical parameters on convective flows in non-uniformly heated cylindrical fluid layers

Influence of geometrical parameters on convective flows in non-uniformly heated cylindrical fluid layers

Lattice Boltzmann Method for Natural Convection Flows in a Full Scale Cavity Heated from Below

Contaminant spreading by natural convection in a box

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