
Zouhour AraoudEcole Nationale d'Ingénieurs de Monastir
Zouhour Araoud
Doctor of Engineering
About
43
Publications
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Introduction
I am a lecturer-researcher at ENIM with two PhDs in energy engineering and plasma physics. My work mainly focuses on numerical simulation, particularly with COMSOL Multiphysics, for modeling thermal, fluidic, and electromagnetic phenomena. I have published several articles in renowned journals and contributed to international research projects in energy optimization and numerical modeling.
Publications
Publications (43)
In this work, we analyze numerically, using Comsol Multiphysics, the influence of four parameters (the power of the lamp, the ambient temperature, the angle of inclination of the lamp and the number of holes in the lamp cavity) on the evolution of the junction temperature of a LED lamp placed in a multi-hole cavity using a fractional factorial plan...
This paper presents the results of a numerical investigation by design of experiments of the thermal management of a symmetrical rectangular heat sink for LED lighting placed in a cavity with asymmetrical conditions at its opening. Our mathematical model is validated by an experiment we carried out for an LED placed in a cavity. According to the pr...
Recently, thermal management of LEDs lamps has become increasingly essential due to the widespread integration of LEDs in smart lighting applications. In this work, we focus on the thermal analysis of convective heat transfer using a honeycomb heat sink designed for LEDs lamp cooling. Three different heat sink geometries were examined: an aluminum-...
The objective of this study is to develop a digital twin of a street lighting pole, enabling remote control and monitoring according to a smart lighting framework. The project encompasses the creation of a DT-pole model for an entire street and the evaluation of its energy efficiency. A physical prototype is built, integrating sensors for data acqu...
This paper presents a CFD study of ion wind
generated airflow which is corona discharge induced flow at
the tip of a curved electrode and represents a new cooling
method for light emitting diodes (LEDs).The details of a
numerical study of the natural convection around the radial
radiator with a central pole for the 200 W LED have been
examined. The...
Ionic wind generation is a good candidate for cooling high power LED lights because it is both quiet, with no moving mechanical parts and very energy efficient. This preliminary work relates to a simulation of the corona discharge of a wire and two plates in air under atmospheric pressure. The results for the same structure are compared with previo...
In this work, we analyze numerically, using Comsol Multiphysics®, the influence of four parameters (the power of the lamp, the ambient temperature, the angle of inclination of the lamp and the number of holes in the lamp cavity) on the evolution of the junction of a LED heat sink placed in a multi-hole cavity using a fractional factorial plan. Taki...
LED lighting devices are today capable of replacing any light source, whatever its luminous power, with unequaled energy efficiency and a considerable lifespan. However, these are sensitive to heat, which is all the more important for high-power LEDs. The greater the power, the larger the heatsink. The active cooling device by ionic winds is a very...
This paper investigates the kinetic study in an inductive discharge lamp. Numerical simulation of electron density and other parameters that characterize the plasma are discussed and their values are compared with what is expected in inductive plasma and which show a good agreement considering the electron density and the electron temperature value...
Thermal management of light emitting diodes (LEDs) packages is indispensable to maintain lower operating temperature. The present paper reports a numerical analysis of 45W LEDs module. Two forms of substrate and chips are compared. Results show that circular chips mounted on circular substrate provide lower junction temperature of the package thank...
LED lighting still suffers from its thermal problem linked mainly to the increase in junction temperature. The situation becomes more and more aggravated when it comes to decorative lighting. Indeed, this type of lighting application sometimes requires that the heat sink of the LED lamp be integrated into a narrow space, such as false or sloped cei...
Despite the continuous progress of its technology, thermal management ofLight Emitting Diode packages (LEDs) still the key of their good performances and long lifetime. In this paper, a numerical analysis of 45W LEDs arrays developed using COMSOL Multiphysics®. The PCB LED Board and the heat sink have circular forms. Thirty-six chips are arranged o...
With LED lighting systems, 70% of the energy consumed is lost in thermal form. It would be possible to increase the efficiency of the system by converting this wasted thermal energy into light. Some proposals using Peltier modules have been made. This article is interested in the limits of these solutions by evaluating the drop in the luminous effi...
With LED lighting systems, 70% of the energy consumed is lost in thermal form. It would be possible to increase the efficiency of the system by converting this wasted thermal energy into light. Some proposals using Peltier modules have been made. This article is interested in the limits of these solutions by evaluating the drop in the luminous effi...
This work deals with a numerical study of natural convection heat transfer around rectangular heat sink in an inclined enclosure. The effects of the cavity orientation and its length on the thermal and dynamic behavior were carried out. Their effects on photometric properties of the LEDs lamp were also evaluated. Results showed that these parameter...
Reducing energy consumption in all areas is an ecological and economic necessity. The energy losses are manifested in most cases by a release of heat which reduces the energy efficiency of the system. The recovery of these thermal losses, if they are in sufficient quantity, can be a solution to reduce the overall energy consumption of the system an...
Light Emitting Diodes emits no IR and no UV and their spectrum is fully in the visible part. But LEDs are not cold and all energy losses are thermal losses. The aim of this paper is to prove the feasibility to reuse the thermal losses to produce light through a thermoelectric module. Papers where Peltier modules are included in LEDs systems are all...
The use of light emitting diodes (LEDs) for lighting requires high level of thermal management. In fact, the lamp is more efficient when operating under lower junction temperature. In this paper, we present a three dimensional analysis of 106 W multi-chip LEDs lamp using finite element method. A comparison between two different substrate designs wa...
An appropriate coupling of an arc plasma column in the state of local thermodynamic equilibrium to a refractory cathode necessarily involves the non-equilibrium boundary layer between them. A model has been developed that combines a model of an equilibrium direct current arc plasma in atmospheric pressure argon with the assembly of a cathode made o...
In this work an arc model is employed along with electric and spectroscopic measurements to study DC electric arcs in Ar and CO<sub>2</sub>. The model is aimed at describing the arc and the electrodes. Simulation and experimental results are shown for currents between 150 A and 210 A.
Light emitting diodes (LEDs) are fascinating a thermal problem due to the increase of their junction temperature. Thermal management of LED module is the key to improve the performances of LED. In this paper, a three dimensional thermal analysis of 3.5W multi-chip COB (chip-on-board) LED package was developed using COMSOL Multiphysics®. An optimiza...
This paper presents the details of a numerical study of the LEDs thermal conduction path deficiency. A three-dimensional numerical modeling using COMSOL Multiphysics® simulation software has been developed. The model was then validated by the literature, showed a good agreement. The effect of the number of LED-chips put on substrate was studied sin...
Light emitting diode (LED) light source is increasingly used for general lighting and seems to replace the fluorescent and incandescent source. However LED suffers from thermal problem. Thermal management of LED is essentially based on natural convection cooling. Experimental study of the orientation effects on the heat transfer of fin heat sink un...
The aim of this work is to study the local thermodynamic equilibrium (LTE) deviations in arc discharges plasma generated in high-intensity discharge lamps operating under an ac (50 Hz) power supply. To achieve this goal, we elaborate a two-temperature, two-dimensional, and time-depending model. We have found numerical results almost reproducing the...
Thermography is an established experimental method to measure wall temperatures of high-pressure discharge lamps resulting in 2-D images. However, theoretical models, including the heat balance of the tube wall, are usually based on a cylinder symmetric 2-D model, where the tube wall surface is represented by a 1-D line. In this paper, a comparison...
This paper discusses the thermal behavior of a high pressure mercury lamp in a horizontal position, compared with that of a vertical lamp. The model adopted is three-dimensional, steady, and powered DC. After the model validation, we analyzed temperature fields and velocities for the case of the lamp in a horizontal position by comparing it with th...
In this article we will discuss, in detail, the results obtained for a simple geometry of discharge (two-dimensional stationary or one-dimensional non stationary). It aims to give an idea about the discharge properties that emerge from the interaction of various physical processes. By using a variation of the fundamental parameters, we can show the...
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 tr...
The main objective of this work is to provide a better understanding of the warm-up phase of high-intensity discharge lamps. As an example of application, we chose the high-pressure mercury lamp. Based on two-dimensional fluid model parameters, such as the electric current, the length and the diameter of the burner are modified and the effect of th...
Summary form only given. The warm-up phase of a pure mercury high-pressure discharge is investigated. Understanding the properties of plasmas during their transitory phase is a key technological challenge in the lighting industry sectors. The simulation of the warm-up phase is also of scientific interest since it reflects the influence of the press...
A time-dependent two-dimensional computational fluid model has been adopted to investigate the dynamic behavior of the high-pressure mercury lamp during the last phase of the warm-up period. The model solves the combined momentum, continuity, energy, and electric field equations for the plasma and the energy equation for the wall. Two models have b...
A two-dimensional fluid model has been used to investigate the thermal and dynamic behavior of a high pressure mercury lamp during the high pressure phase. Among the various important mechanisms present in the arc, natural convection effect plays a pivotal role in determining the qualitative as well as quantitative distribution of the temperature f...
form only given. The simulation of the high pressure mercury lamp during the warm-up phase is a very complex problem because of the numerous and various physical processes that should be taken into account. In fact, it takes several minutes for such a lamp to warm up to its operating conditions (several minutes). During this time, there is a substa...
A two dimensional finite element fluid model coupled to a chemical model has been developed to predict the behaviour of a HgTlI discharge lamp. The effect of the atomic ratio on the temperature field, velocity distribution and transport coefficients of the HgTlI discharge has been explored. It has been shown that the variation of the mercury to tha...
This paper presents a numerical study of the dynamic behavior of high-pressure mercury discharge lamp as a function of supply mode. Bidimensional time-dependent equations have been solved by using a semi-implicit finite-element code. The model has been developed in the frame of the local thermodynamic equilibrium hypothesis. After validation by usi...
A 2D model based on the assumption of LTE condition has been developed to predict the behavior of a HgTlI discharge lamp. The model has taken convective and diffusion transport of various species into account. Chemical composition, local fluid properties as well as temperature and velocity have been performed for the entire discharge.
When mercury high-pressure lamps are operated at high frequencies, arc instabilities are occasionally observed and can destroy the discharge tube. This phenomenon attributed to the excitation of standing pressure waves inside the discharge vessel is called "acoustic resonance". The present work is concerned with the comprehension of this complex ph...
Le travail présenté concerne la modélisation de la dernière phase de la montée en régime d'une lampe à décharge mercure haute pression. La simulation de la décharge a été conduite dans le cadre de l'hypothèse de l'Équilibre Thermodynamique Local, en utilisant un modèle fluide bidimensionnel et dépendant du temps. Après validation des résultats avec...