Total pressure and atomic ratio effect on transport coefficients of HgTlI discharge plasma using a LTE chemical model

Hamida, Mohamed Bechir Ben; Salah, Soumaya Hadj; Charrada, K.

doi:10.1140/epjd/e2015-60303-5

Cited by 20 publications

(11 citation statements)

References 37 publications

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“…respectively, then utilized to determine the concentration aforementioned in equation (5). Table 2 shows the effect of the mercury concentration on the elastic power loss.…”

Section: Total Collision Frequency Modelingmentioning

confidence: 99%

“…External charge density ρ ext (r,t), is contained in the dielectric function to calculate the electronic. The discharge is called for any electric current process that flows through an ionizing gas, any process of ionization occurrence, and the property of electrical conductivity under the influence of an applied electric field [4,5]. Since the ionized gas mostly glows and the discharge is flame due to combustion [4].…”

Section: Introductionmentioning

confidence: 99%

“…Transfer coefficients were first studied theoretically or empirically for equilibrium plasma, such as pure hydrogen, nitrogen, oxygen, air and noble gases. The theory of transport properties of gas mixtures was developed by Chapman and Cowling, by Hirsch elder, Curtis, and Bird [5]. Many researchers have theoretically calculated electron transport coefficients using the Boltzmann Equation method.…”

Section: Introductionmentioning

confidence: 99%

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Simulation Analyses and Investigation of the Induced Electric Field and Ar-Hg Mixture on the Gas Discharge Processes

Hadi

Ali

Al-Rubaiee

2020

MJS

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In this work, theoretical calculations and simulated data were presented to investigate the effect of the Ar: Hg mixture on electronic plasma coefficients, in addition to study the influence of the electric field and focus on electronic coefficients. The low electric field was chosen in the range (1-1000) Td, and concentrations in a limited range (0.01-0.09) mol. The results showed a clear effect of the electric field on electronic transactions, especially at low levels. These parameters values are higher for high concentrations due to the effect of the electric field on the excitation and ionization energy. In compare to elastic and inelastic collision, and cross-section collision of gas discharges. The results showed good agreement between the original data (using BOLSIG +) and the estimated data in the current work.

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“…respectively, then utilized to determine the concentration aforementioned in equation (5). Table 2 shows the effect of the mercury concentration on the elastic power loss.…”

Section: Total Collision Frequency Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation Analyses and Investigation of the Induced Electric Field and Ar-Hg Mixture on the Gas Discharge Processes

Hadi

Ali

Al-Rubaiee

2020

MJS

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“…The enhancement of heat transfer has been the objective of many research articles in different applications such as discharge lamps [1][2][3][4][5][6][7][8][9][10][11]. In the same research area, many studies have been established to examine the natural convection heat transfer inside a porous medium due to the importance of this scientific research in many engineering applications, such as in solar collectors, the cooling of micro-electromechanical systems (MEMS) and various industrial applications, as reported by Pop and Ingham [12], Bejan et al [13], Vafai [14], Sankar et al [15] and Ben Hamida et al [16].…”

Section: Introductionmentioning

confidence: 99%

MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al2O3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

et al. 2020

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In this paper, a 2D numerical study of natural convection heat transfer in a W-shaped inclined enclosure with a variable aspect ratio was performed. The enclosure contained a porous medium saturated with Ag/Al2O3 hybrid nanofluid in the presence of uniform heat generation or absorption under the effect of a uniform magnetic field. The vertical walls of the enclosure were heated differentially; however, the top and bottom walls were kept insulated. The governing equations were solved with numerical simulation software COMSOL Multiphysics which is based on the finite element method. The results showed that the convection heat transfer was improved with the increase of the aspect ratio; the average Nusselt number reached a maximum for an aspect ratio (AR) = 0.7 and the effect of the inclination was practically negligible for an aspect ratio of AR = 0.7. The maximum heat transfer performance was obtained for an inclination of ω = 15 and the minimum is obtained for ω = 30 . The addition of composite nanoparticles ameliorated the convection heat transfer performance. This effect was proportional to the increase of Rayleigh and Darcy numbers, the aspect ratio and the fraction of Ag in the volumetric fraction of nanoparticles.

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“…Today, light emitting diodes (LED) illumination is the most preferable light source. It succeeds mercury discharge lamp (Ben Hamida and Kamel, 2011, 2012, 2013, 2015a) and metal halide lamp (Ben Hamida et al , 2015b) owing to its immediate lighting, its low consummation and its high lifetime. However, it converts more than 80 per cent of the electric power into heat.…”

Section: Introductionmentioning

confidence: 99%

Alternate PCM with air cavities in LED heat sink for transient thermal management

Salah

Hamida

2019

HFF

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Purpose The purpose of this paper is to optimize the configuration of a heat sink with phase change material for improving the cooling performance of light emitting diodes (LED). Design/methodology/approach A numerical three-dimensional time-dependent model is developed with COMSOL Multiphysics to simulate the phase change material melting process during both the charging and discharging period. Findings The model is validated with previously published works. It found a good agreement. The difference between filled cavities with phase change materials (PCM) and alternate cavities air-PCM is discussed. The last-mentioned showed a good ability for reducing the junction temperature during the melting time. Three cases of this configuration having the same total volume of PCM but a different number of cavities are compared. The case of ten fins with five PCM cavities is preferred because it permit a reduction of 21 per cent of the junction temperature with an enhancement ratio of 2:4. The performance of this case under different power input is verified. Originality/value The use of alternate air-PCM cavities of the heat sink. The use of PCM in LED to delay the peak temperature in the case of thermal shock (for example, damage of fan) An amount of energy is stored in the LED and it is evacuated to the ambient of the accommodation by the cycle of charging and discharging established (1,765 Joule stored and released each 13 min with 1 LED chip of 5 W).

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Total pressure and atomic ratio effect on transport coefficients of HgTlI discharge plasma using a LTE chemical model

Cited by 20 publications

References 37 publications

Simulation Analyses and Investigation of the Induced Electric Field and Ar-Hg Mixture on the Gas Discharge Processes

Simulation Analyses and Investigation of the Induced Electric Field and Ar-Hg Mixture on the Gas Discharge Processes

MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al2O3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

Alternate PCM with air cavities in LED heat sink for transient thermal management

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