A two-dimensional modeling of the warm-up phase of a high-pressure mercury discharge lamp

Araoud, Zouhour; Ahmed, Rafiuddin; Hamida, Mohamed Bechir Ben; Franke, St.; Stambouli, Moncef; Charrada, K.; Zissis, Georges

doi:10.1063/1.3436597

Cited by 19 publications

(8 citation statements)

References 23 publications

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“…Heat transfer performance is a very important topic due to it being present in different engineering domains like plasma manufacture, 1‐12 the improvement of thermal system performance such as solar collectors, 13 condensing and evaporating systems, 14 bubble absorber system, 15‐18 LED lamps, 19,20 heat exchanger, 21‐23 nano–encapsulated phase change materials (NEPCMs), 24‐27 and geothermal and nuclear energies. Currently, due to technological development the cooling of microelectronics devices has become a crucial topic, which attracts the interest of researchers.…”

Section: Introductionmentioning

confidence: 99%

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

Massoudi

Hamida

2020

Heat Trans

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This study aims to study numerically the free convection and thermal radiation of an Ag‐water nanofluid inside an L‐shaped inclined microelectronic module under inclined Lorentz forces and uniform heat generation/absorption effects. The study is established using the software COMSOL Multiphysics based on the finite element method. The main results obtained show that convection heat flow enhances by increasing the Rayleigh number, radiation parameter and nanoparticles shape factor, however, it reduces with increasing the Hartmann number and the aspect ratio. In addition, the presence of uniform heat absorption improves the convection heat flow, by contrast, the presence of uniform heat generation damages this. Besides this, the Lorentz forces' directional impact on the convection heat flow is linked to module inclination. The average Nusselt reaches a maximum for module inclination γ = 45 °.

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Section: Introductionmentioning

confidence: 99%

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

Massoudi

Hamida

2020

Heat Trans

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“…The topic of this work is to examine the performance of the warm-up model including 2D convection processes 8,14 by an extended and consistent set of experimental parameters. This has not been done in previous papers.…”

Section: Comparison Of Model and Experimental Datamentioning

confidence: 99%

Experimental and theoretical investigations on the warm-up of a high-pressure mercury discharge lamp

Zalach¹,

Araoud²,

Charrada³

et al. 2011

Physics of Plasmas

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Modern high-pressure discharge lamps are forced to provide instant light and hot relight capabilities-if possible at lower power units. A detailed understanding of the warm-up of high-pressure discharge lamps is therefore required. Complex fluid model codes were developed for the past years including more and more processes like two-dimensional treatment of convection trying to provide a more comprehensive and consistent description of high-pressure discharge lamps. However, there is a lack of experimental data to examine the performance of these models. This work provides a very complete set of geometrical, electrical, spectroscopic, and thermographic data according to the warm-up of a high-pressure mercury discharge lamp that is compared to the results of a state of the art fluid code. Quantitative agreement is achieved for single parameters like wall temperatures. But the paper also reveals the need for further investigations and improvements of the code.

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“…Free convection heat transfer inside cavities under magnetic field effect is an important topic that attracted the interest of many researchers due to it is importance value in many technological and engineering applications like plasma manufacturies (Ben Hamida and Charrada, 2012, 2014aStevanovi et al, 2003;Ben Hamida et al, 2011Liu et al, 2019;Araoud et al, 2010;Ferjani and Ben Hamida, 2019), crystal formation procedure, geothermal energy extraction, the melting phase change process (Izadi et al, 2020a), squeeze casting processes (Cruchaga et al, 2004;Lewis et al, 2007) and nuclear energy reactor.…”

Section: Introductionmentioning

confidence: 99%

Free convection and thermal radiation of nanofluid inside nonagon inclined cavity containing a porous medium influenced by magnetic field with variable direction in the presence of uniform heat generation/absorption

Massoudi

Hamida

Almeshaal

2020

HFF

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Purpose The purpose of this paper is to study the natural convection and radiation heat transfer inside Nonagon inclined cavity with variable heated source length, which contains a porous medium saturated with nanofluid in the presence of uniform heat generation or absorption under the effect of uniform magnetic field with variable direction. The shape factor of nano particles is taking account for the model of nanofluid. Design/methodology/approach This study is established in two-dimensional space. The 2D numerical study is effectuated with Comsol Multiphysics based on the on the finite element method. The 2D equation system is exposed on dimensionless form taking into account the boundary conditions. Findings Results obtained show that the convection heat transfer is ameliorated with the augmentation of heated source length. The convection heat transfer is enhanced by increasing Rayleigh, Darcy numbers and the heated source length; however, it is reduced by rising Hartmann number. The presence of radiation parameter lead to improve the convection heat transfer in the presence of both uniform heat generation/absorption. The average Nusselt number reaches a maximum for an inclination of cavity γ = 45° and a minimum for γ = 60°. Both the increase of the shape factor of nano particles and the solid fraction of nano particles improve the convection heat transfer. Originality/value Different studies have been realized to study the heat transfer inside cavity contains porous medium saturated with nanofluid under magnetic field effect. In this work, the Nonagon geometric of cavity studied has never been studied. In addition, the effect of radiation parameter with relation of the shape factor of nanoparticles in the presence of uniform heat generation/absorption on the heat transfer performance have never been investigated. Also, the effect of magnetic field direction with relation of the inclination cavity on heat transfer performance.

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A two-dimensional modeling of the warm-up phase of a high-pressure mercury discharge lamp

Cited by 19 publications

References 23 publications

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

Experimental and theoretical investigations on the warm-up of a high-pressure mercury discharge lamp

Free convection and thermal radiation of nanofluid inside nonagon inclined cavity containing a porous medium influenced by magnetic field with variable direction in the presence of uniform heat generation/absorption

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