sonia besbes

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Roberto Moreno-Atanasio

The University of Newcastle

Pak Roto

Universitas Gadjah Mada (Yogyakarta)

Fathul Muin

Universitas Gadjah Mada (Yogyakarta)

SHANMUKHA KIRAN

University of Michigan

Ajay Bhardwaj

SSBT, COET,North Maharashtra University, India

Mohammad Khattak

University of Louisiana at Lafayette

Ralph Spolenak

Swiss Federal Institute of Technology (ETH)

Iryna Golovina

Drexel University

Haider Zaman

Taibah University, Madinah, Saudi Arabia

Mahmoud Elwaheidi

King Saud University

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Papers by sonia besbes

Computational Fluid Dynamics (CFD) Simulation of Transient Flow in a Rectangular Bubble Column Using a Coupled Discrete Phase Model (DPM) and Volume of Fluid (VOF) Model

World Academy of Science, Engineering and Technology, International Journal of Mechanical and Mechatronics Engineering, Jun 21, 2017

Numerical and experimental study of two turbulent opposed plane jets

Heat and Mass Transfer, 2002

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Low Reynolds Number Turbulence Models to Simulate the Bubble Plume Behavior with the Euler-Euler Method

Journal of Applied Fluid Mechanics, 2021

This paper presents a comparative assessment of low Reynolds number k- models against standard k... more This paper presents a comparative assessment of low Reynolds number k- models against standard k- model in an Eulerian framework. Three different low-Re number k- models: Launder-Sharma (LS), Yang-Shih (YS) and AbeKondoh-Nagano (AKN) have been used for the description of bubble plume behaviour in stratified water. The contribution of the gas phase movement into the liquid phase turbulence has been achieved by using the Dispersed with Bubble Induced Turbulence approach (DIS+BIT).The results reveal that the oscillation frequency of gas-liquid flow are correctly reproduced by standard k- and LS models. In fact, we found for standard K- and LS a clear dominant peak at a frequency equal to 0.1 Hz. On the other hand, YS and AKN models have predicted chaotic oscillations. The oscillation amplitude of the bubble plume predicted from LS model seems to be in good agreement with the PIV measurements of Besbes et al. (2015). However, for the standard K- model the oscillation amplitude is low. The air-water interface shows that the bubble plume mixing with the stratified water is predicted to be stronger compared to standard k- model.

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Numerical study of a heated cavity insulated by a horizontal laminar jet

Energy Conversion and Management, 2001

In this work, we present a numerical study of the thermal insulation of a heated two dimensional ... more In this work, we present a numerical study of the thermal insulation of a heated two dimensional cavity limited on its superior part by a horizontal plane air jet. The lower horizontal wall is isothermal, while the two vertical walls are adiabatics. A ®nite dierence method based on the stream function±vorticity formulation is developed to solve the dimensionless Navier±Stokes and energy equations resulting from some assumptions. The results allowed us to point out two ¯ow con®gurations: if natural convection prevails, the hot jet issuing from the nozzle diuses upwards, and consequently, the cavity cannot be insulated correctly. However, the use of an aspiration zone can then improve the insulation. When forced convection predominates, the hydrodynamic barrier is conserved, and the enclosure is also thermally well con-®ned.

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Computational Fluid Dynamics (CFD) Simulation of Transient Flow in a Rectangular Bubble Column Using a Coupled Discrete Phase Model (DPM) and Volume of Fluid (VOF) Model

World Academy of Science, Engineering and Technology, International Journal of Mechanical and Mechatronics Engineering, 2017

Isolation thermique d'une enceinte par un rideau d'air horizontal

On se propose d'etudier dans ce travail, l'isolation thermique d'une enceinte ouverte... more On se propose d'etudier dans ce travail, l'isolation thermique d'une enceinte ouverte sur sa partie superieure en regime laminaire. Deux possibilites sont envisagees: l'utilisation d'un seul jet d'air plan horizontal ou de deux jets horizontaux opposes. La paroi horizontale basse de l'enceinte est isotherme et les deux parois verticales sont adiabatiques. Les equations de conservation de la masse, de la quantite de mouvement et de l'energie sont resolues par la methode des differences finies basee sur la formulation vorticite-fonction de courant. Les resultats sont obtenus en faisant varier plusieurs parametres tels que, le facteur de forme de la cavite et la vitesse du jet a l'ejection.

Etude numérique et expérimentale de l'interaction de jets : application à l'isolation aérothermique d'une enceinte

Les recherches menees dans le cadre de ce travail, portent essentiellement sur le probleme de l&#... more Les recherches menees dans le cadre de ce travail, portent essentiellement sur le probleme de l'isolation aerodynamique et thermique d'une enceinte ouverte a l'ambiance a l'aide d'une barriere aerodynamique constituee par un systeme de jets. L'analyse de l'ecoulement dans une enceinte ouverte et isolee par un jet d'air vertical descendant ou horizontal, montre qu'en regime de convection forcee, la cavite est correctement isolee du milieu exterieur alors qu'en regime de convection mixte, la barriere hydrodynamique est brisee et la cavite reste alors ouverte a l'ambiance. Un modele simplifie faisant abstraction de l'environnement exterieur a ete propose en regime de convection forcee. L'etude precedente est menee en faisant l'hypothese d'un regime laminaire. Ce cas etant difficile a realiser a l'echelle industrielle, l'hypothese du regime turbulent est retenue dans cette partie qui traite specifiquement de l'inter...

Simulation numérique de l'isolation thermique d'une cavité en convection forcée

On etudie numeriquement, a l'aide d'une technique aux differences finies, la convection f... more On etudie numeriquement, a l'aide d'une technique aux differences finies, la convection forcee laminaire dans une cavite dont la paroi verticale droite est materialisee par un ecoulement force qui a pour role d'isoler thermiquement l'enceinte du milieu exterieur. Cette simulation permet d'etudier l'influence de la vitesse et de la temperature du filet d'air sur la structure de l'ecoulement dans la cavite. L'objectif de cette etude est d'analyser l'interaction de cet ecoulement avec le mouvement naturel qui prend naissance dans la cavite sous l'effet des contraintes thermiques parietales afin d'examiner les qualites de l'isolation thermique du rideau d'air.

Influence of operating conditions and liquid phase viscosity with volume of fluid method on bubble formation process

In this paper, a numerical study of air bubble formation and detachment in water (S-1) and in gly... more In this paper, a numerical study of air bubble formation and detachment in water (S-1) and in glycerin solutions (S-2 and S-3) was investigated using the volume of fluid (VOF) method. The full formation process was studied under the effect of operating conditions such as wettability of the orifice plate (static contact angle θ S ), orifice diameter and orifice air velocity. In addition, the influence of the viscosity of the liquid phase was examined. The numerical simulations were carried out for different orifice velocities satisfying the quasi-static bubble growth condition at low Capillary and Bond numbers. Under such conditions, the surface tension effect is dominant over viscous drag and buoyancy effects. The bubble growth at different instants predicted by the VOF simulation was experimentally validated in water. During the expansion/elongation stage significant bubble shape oscillations have been observed by the simulation. In water, bubble shape is mainly dominated by inerti...

Numerical simulation of free ascension and coaxial coalescence of air bubbles using the volume of fluid method (VOF)

The dynamics of a single air bubble, the wake structure, the instantaneous liquid velocity field ... more The dynamics of a single air bubble, the wake structure, the instantaneous liquid velocity field around it and the coaxial coalescence of two successive bubbles have been widely studied in this work by using the VOF method on the software platform of Fluent. It is observed that the bubble rising trajectory changes from one dimension to three dimensions by decreasing the viscosity of the liquid phase. The different behaviors of air bubbles introduce various instantaneous bubbles wake structures which strongly depend on their shape and on the physical properties of the liquid phase. Indeed, as the solution viscosity decreases, the bubbles’ shape changes from non-deformed (ellipsoidal) to the deformed shape. In the case of bubbles chain, the wake of the leading bubble significantly affects the shape, trajectory and velocity of the trailing bubble, as well as the velocity field of the liquid phase surrounding it. For high orifice air velocities and due to the wake of the leading bubble,...

Vof Method Applied to Simulate the Hydrodynamics of Rising Bubbles in Bubble Column Reactor

CFD Study of Gas Density Effect on the Formation and Dynamics of Gas Bubbles in Stagnant Water

International Journal of Fluid Mechanics Research

Etude numérique et expérimentale de l'interaction de jets : application à l'isolation aérothermique d'une enceinte

Study of the rise of a single/multiple bubbles in quiescent liquids using the VOF method

Journal of the Brazilian Society of Mechanical Sciences and Engineering

Isolation thermique d'une enceinte par un rideau d'air horizontal

Colloque Annuel Sft, 2000

Effect of bubble plume on liquid phase flow structures using PIV

Particulate Science and Technology

Analysis of the effect of a pulsed heat flux on the performance improvements of a thermoelectric generator

Applied Thermal Engineering

PIV measurements and Eulerian-Lagrangian simulations of the unsteady gas-liquid flow in a needle sparger rectangular Bubble column

Chemical Engineering Science

In this work, we conducted a detailed experimental as well as a computational study for the hydro... more In this work, we conducted a detailed experimental as well as a computational study for the hydrodynamic characterization of the flow in a needle sparger rectangular bubble column. Particle image velocimetry technique (PIV) was used to simultaneously capture the images of both bubbles and seeding polyamide tracers of 50 μm in diameter, the tracer particles were selected to provide sufficient contrast and were neutrally buoyant. A three-dimensional computational model based on an Euler-Lagrange (E-L) approach was performed to simulate the dynamic characteristics of the oscillating bubble plume. The continuous phase velocity field was obtained by solving the unsteady Reynolds averaged Navier-Stokes equations along with the k-ε turbulence model. Bubble tracking was achieved by solving the Newton equations of motion taking into account drag force, pressure, buoyancy and gravity. Two-way coupling between the liquid and gas phases are accounted for in the continuous phase momentum equatio...

PIV measurements of the unsteady gas-liquid flow in a rectangular bubble column