Radiation effects on natural convection in a vertical channel with an auxiliary plate

Andreozzi, Assunta; Manca, Oronzio

doi:10.1016/j.ijthermalsci.2015.05.013

Cited by 13 publications

(3 citation statements)

References 51 publications

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“…In fact, the majority of the literature on heating by discrete sources is restricted to the one-dimensional approach. When dealing with natural convection, one must be aware of the importance of radiative effects [25]. Most of the works described in the following have been declined for mixed or forced convection, as for instance in [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

et al. 2016

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Abstract:Heat sources, such as power electronics for offshore power, could be cooled passively-mainly by conduction and natural convection. The obvious advantage of this strategy is its high reliability. However, it must be implemented in an efficient manner (i.e., the area needs to be kept low to limit the construction costs). In this study, the placement of multiple heat sources mounted on a vertical plate was studied experimentally for optimization purposes. We chose a regular distribution, as this is likely to be the preferred choice in the construction process. We found that optimal spacing can be determined for a targeted source density by tuning the vertical and horizontal spacing between the heat sources. The optimal aspect ratio was estimated to be around two.

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Section: Introductionmentioning

confidence: 99%

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

et al. 2016

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“…The radiation effects on natural convection in a vertical channel with an auxiliary plate was presented in [8]. The vertical channel in this article was symmetrically heated and a uniform heat flux along the principal walls of the channel was assumed.…”

Section: Introductionmentioning

confidence: 99%

“…Findings of this study showed that the lowest maximum channel wall temperatures could be attained for the auxiliary plate placed at the channel exit for high channel Rayleigh numbers and heat flux values. Correlations for the average Nusselt number, global average Nusselt number and dimensionless maximum wall temperature in terms of channel Rayleigh number and auxiliary plate-to-channel height ratio were presented in the study [8].…”

Section: Introductionmentioning

confidence: 99%

Investigations of Couette Flow Unsteady Radiative Convective Heat Transfer in a Vertical Channel Using the Generalized Method of Lines (MOL)

Sowayan

2022

International Journal of Applied Mechanics and Engineering

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This study describes a very efficient and fast numerical solution method for the non-steady free convection flow with radiation of a viscous fluid between two infinite vertical parallel walls. The method of lines (MOL) is used together with the Runge-Kutta ODE Matlab solver to investigate this problem numerically. The presence of radiation adds more stiffness and numerical complexity to the problem. A complete derivation in dimensionless form of the governing equations for momentum and energy is also included. A constant heat flux condition is applied at the left wall and a transient numerical solution is obtained for different values of the radiation parameter (R). The results are presented for dimensionless velocity, dimensionless temperature and Nusselt number for different values of the Prandtl number (Pr), Grashof number (Gr), and the radiation parameter (R). As expected, the results show that the convection heat transfer is high when the Nusselt number is high and the radiation parameter is low. It is also shown that the solution method used is simple and efficient and could be easily adopted to solve more complex problems.

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Oscillatory slip flow of Fe₃O₄ and Al₂O₃ nanoparticles in a vertical porous channel using Darcy's law with thermal radiation

et al. 2020

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The heat transfer phenomena and oscillatory flow of an electrically conducting viscous nanofluid (NF) in a channel with porous walls and saturated porous media exposed to the thermal radiation are studied. The nanoparticles (NPs) Fe3O4 and Al2O3 are taken with water as base fluid along with nonuniform temperature and velocity slip at the wall of channel (y′ = 0). The basic laws of momentum and energy conservation are converted into the dimensionless system of the partial differential equations (PDEs) using similarity variables. Closed‐form solutions of these coupled PDEs are constructed for all values of time by taking the oscillatory pressure gradient. The physical insight of involved parameters on the fluid velocity, temperature profile, heat transfer rate, and surface friction is studied and analyzed graphically. It is noted from this study that the fluid velocity shows a decreasing behavior with the volume fraction of NPs. Furthermore, the amplitude of the oscillatory motion in case of skin friction decreases for a large magnetic field.

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Radiation effects on natural convection in a vertical channel with an auxiliary plate

Cited by 13 publications

References 51 publications

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

Investigations of Couette Flow Unsteady Radiative Convective Heat Transfer in a Vertical Channel Using the Generalized Method of Lines (MOL)

Oscillatory slip flow of Fe₃O₄ and Al₂O₃ nanoparticles in a vertical porous channel using Darcy's law with thermal radiation

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Radiation effects on natural convection in a vertical channel with an auxiliary plate

Cited by 13 publications

References 51 publications

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

Experimental Optimization of Passive Cooling of a Heat Source Array Flush-Mounted on a Vertical Plate

Investigations of Couette Flow Unsteady Radiative Convective Heat Transfer in a Vertical Channel Using the Generalized Method of Lines (MOL)

Oscillatory slip flow of Fe3O4 and Al2O3 nanoparticles in a vertical porous channel using Darcy's law with thermal radiation

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Oscillatory slip flow of Fe₃O₄ and Al₂O₃ nanoparticles in a vertical porous channel using Darcy's law with thermal radiation