Adel Benselama

Adel Benselama
Ecole Nationale Supérieure de Mécanique et d'Aérotechnique | ENSMA · Institute Pprime

Ph.D.

About

31
Publications
3,106
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241
Citations

Publications

Publications (31)
Article
The effect of a DC electric field on a liquid-vapor interface was investigated at different temperatures using a Pellat-like test cell filled with HFE-7000 and HFE-7100 dielectric fluids. Special attention was given to the local observations of the meniscus as this information is crucial in two-phase heat transfer applications. The results confirme...
Article
Based on Lucas–Washburn's seminal works, a simple model governing the flow inside a narrow channel, partly dipped into a large pool filled with a dielectric liquid, is presented. The channel walls are electrically polarized and can be warmer or cooler than the pool liquid using an appropriate heating and cooling device. The liquid dielectric consta...
Article
The effect of wick structure on the performance of capillary-driven heat pipes is analyzed numerically. Three types of wick structure are investigated: copper screen, sintered steel, and sintered copper. Using lattice Boltzmann method, the entire heat pipe is modeled including heat transfer through the wall and heat and mass transfer in the liquid-...
Article
The performance of a capillary driven heat pipe used in solar collectors is investigated in the present work. An axisymmetric numerical simulation is presented for analyzing heat and mass transfer in cylindrical heat pipe using the Lattice Boltzmann method. The analysis includes the wall, the liquid-wick material and the vapor regions. Comparison b...
Article
Numerical investigation of two-phase loop thermosyphon (2PLT) in steady and transient states is addressed. A one-dimensional two-phase flow model describing a liquid-gas mixture in both mechanical and thermal equilibrium but out of thermodynamic equilibrium is developed. The model considers subcooled liquid and over heated vapor as well as phase tr...
Article
A pseudo three dimensional numerical analysis is presented for simulation of cylindrical heat pipe using the Lattice Boltzmann method. The analysis includes the heat conduction in the wall and liquid-wick regions as well as the vapor region. Comparisons between the present model and previous numerical results showed very good agreement. The estimat...
Article
Full-text available
The present work proposes a simple lattice Boltzmann model for incompressible axisymmetric thermal flows through porous media. By incorporating forces and source terms into the lattice Boltzmann equation, the incompressible Navier-Stokes equations are recovered through the Chapman-Enskog expansion. It is found that the added terms are just the extr...
Article
Modelization of non-isothermal bubbles expanding in a capillary, as a contribution to the understanding of the physical phenomena taking place in Pulsating Heat Pipes (PHPs), is the scope of this paper. The liquid film problem is simplified and solved, while the thermal problem takes into account a constant heat flux density applied at the capillar...
Article
The nonisothermal Taylor liquid-slug-vapor-bubble problem, occurring inside a capillary of circular cross-section, is investigated numerically. The underlying hydrodynamic and mass transfer phenomena are considered the major heat transfer means in pulsating heat pipes. The temperature signature at the outer side of the capillary, inside which the b...
Article
Full-text available
The evaporation process taking place close to the three-phase contact line is considered and studied theoretically using a linear stability analysis approach. A domain perturbation method, taking into consideration thermocapillary effects and surface forces, is used to develop the higher-order solution in terms of series expansion about lubrication...
Article
The effect of substrate inclination on equilibrium profile of a wetting liquid near the contact line is predicted theoretically. The model is based on the augmented Young–Laplace equation, which dictates balance of hydrostatic, capillary and retarded van der Waals dispersion forces. In order to solve this model numerically, a high-order (up to the...
Article
A perturbation method is proposed and used to model the two-dimensional equations governing evaporation in the micro-region of a meniscus on a heated substrate. The novelty of the method lies in the choice of the physical quantities which are used to describe the hydrodynamic and heat transfer phenomena. The chosen quantities are the pressure jump...
Article
Full-text available
Pour gagner en faisabilité, plusieurs modèles de calculs, dont la simulation des explosions, combinent des méthodes uni et tridimensionnelles. La solution du calcul unidimensionnel est la condition initiale du calcul tridimensionnel. Pour être exploitée, cette solution doit être transférée de manière convenable au maillage tridimensionnel. Plusieur...
Article
When the explosion of condensed materials occurs in a tunnel, the subsequent blast wave reveals two patterns. The region close to the explosive charge exhibits a free-field overpressure decay pattern and the region far from the explosion, which undergoes much less overpressure decay, exhibits a quasi-one-dimensional pattern. Well-known overpressure...
Article
The guidelines for protecting against and mitigating explosion hazards require knowledge and either the experimental or theoretical evaluation of blast wave parameters. To this end, this article proposes a numerical method for simulating blast wave propagation in complex geometries. This method permits an on-the-ground TNT-like explosion and the su...
Article
Blast wave generated by a high detonating spherical charge and propagating in confined domains is modeled using the Euler equations. The problem is split into two parts. The first calculation part relies on spherical isotropy to solve the problem in the radial component. Overpressure distribution is presented and shows a very good agreement with ex...
Conference Paper
Full-text available
Blast wave, generated by a high detonating spherical charge, is modeled using the Euler equations. The problem is split into two parts. The first part makes use of the isotropy to solve the problem in spherical radial coordinate. Overpressure distribution is presented and compared to both existing experimental and numerical data with very good agre...
Article
We present the experimental demonstration of the ability of magnetic field to remove buoyancy effects on flames. The experiment consists to observing the shape and colour changes of a laminar jet diffusion flame located in the air-gap of a Bitter magnet able to delivering up 650T2/m in magnetic gradient intensity. At some critical (predicted theore...
Preprint
Full-text available
Droplet impact onto a solid surface is modeled and numerically simulated using an ALE formulation of the Navier-Stokes free surface equations. The triple line dynamics aspect is modeled implicitely through the Shikhmurzaev theory. Those equations involve a generalized Navier slip boundary conditions with the variation of the surface tension near th...
Article
Full-text available
We model and simulate numerically a droplet impact onto a solid substrate. The triple line dynamics modelling is implicit (as opposed to classical explicit mobility relations), it is based on the Shikhmurzaev equations. These equations include generalized Navier slip type boundary conditions with extra local surface tension gradient terms. Numerica...
Article
The validity of the point-dipole approach, frequently used to estimate the dielectrophoretic force applied upon biological cells in microsystems, is examined. Forces given by this approach are compared to those obtained by the Maxwell stress tensor method. In a needle-plate electrode configuration, results provided by finite element method show tha...
Article
The deformations of a real dielectric droplet subjected to a uniform alternating electric field and immersed in an insulating fluid are numerically studied by the Boundary Element Method. The alternating electric field time scale is taken much smaller than the hydrodynamic time scale of the droplet shape deformation. The influence of the frequency...
Article
Full-text available
Date de début de rédaction : 01/05/2005 Date de fin de rédaction : 28/10/2005 Date de soutenance : 25/11/2005 Date de remise de la version définitive : 06/12/2005
Conference Paper
Simulations based on the boundary element method (BEM) are performed in order to study the response of a droplet, immersed in an immiscible fluid, subjected to a DC or AC electric field. As the applied electric field is nonuniform, the droplet undergoes dielectrophoretic (DEP) forces. For the DC electric field case, the forces and deformations are...
Article
Full-text available
Maxwell Stress Tensor (MST) method is investigated in this study to quantify the degree of approximation made with the point-dipole method in respect to dielectrophoresis (DEP) in micro-devices. Latex particles and biological cells immersed in aqueous buffers of various conductivities are considered. The two methods (point-dipole and MST full appro...

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