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Loannis TSOUMPAS


coordonnées


Loannis TSOUMPAS
tel +32-2-650.55.35, fax +32-2-650.57.67, cenoli@ulb.ac.be



unités de recherche


Centre Interdisciplinaire de Phénomènes Non-linéaires et de Systèmes Complexes [Center for Nonlinear Phenomena and Complex Systems] (Cenoli)
TIPs - Physique des fluides [TIPs - Fluid Physics] (TIPs - FLUIDs)



projets


Convection et échange de matière aux interfaces (ESA MAP-CIMEX) [Convection and Interfacial Mass Exchange (ESA MAP-CIMEX)]
Ce programme de recherche MAP (Microgravity Application Promotion) financé par l'Agence Spatiale Européenne et la Politique Scientifique Fédérale étudie les phénomènes de changement de phase et de transfert de matière à travers les interfaces liquide-gaz et liquide-liquide, ainsi que leur couplage avec les mouvements des fluides générés par la gravité et/ou la tension superficielle. Bien que l'essentiel de la recherche concerne l'évaporation, avec des applications en technologies de transfert de chaleur (refroidissement de composants électroniques) d'autres transferts sont également étudiés tels que l'absorption de gaz ou l'extraction de solvant, pour lesquels de nombreuses applications existent en Génie Chimique. En plus des études théoriques et numériques, des expériences sont réalisées non seulement en laboratoire, mais aussi en conditions de pesanteur réduite (vols paraboliques, fusée-sonde, satellites, station spatiale internationale). [This MAP (Microgravity Application Promotion) research program, funded by the European Space Agency and the Belgian Science Policy, studies phase change phenomena and mass transfer through liquid-gas and liquid-liquid interfaces, as well as their coupling with fluid motions induced by gravity and/or surface tension. While most of the research is on evaporation, with applications in heat transfer technologies (cooling of electronic components), other transfer phenomena are also studied such as gas absorption or solvant extraction, for which numerous applications exist in the field of chemical engineering. In addition to theoretical and numerical studies, experiments are realized, both in the laboratory and in reduced-gravity conditions (parabolic flights, sounding rockets, satellites, international space station). ]

Ebullition, transfert de chaleur et gestion des liquides - Influence de la gravité et des champs électrostatiques (ESA MAP-BOILING) [Boiling, heat transfer and fluids management - Gravity and electrostatic fields influence (ESA MAP-BOILING)]
Ce programme de recherches MAP (Microgravity Application Promotion) de l'Agence Spatiale Européenne associe plusieurs équipes européennes afin d'étudier les aspects fondamentaux et appliqués du phénomène d'ébullition. Plusieurs expériences en microgravité sont prévues, ce qui permet une compréhension plus fine de phénomènes qui, sur terre, sont entièrement dominés par la gravité. Afin de préparer ces expériences, d'autres manipulations sont prévues en laboratoire, en plus d'études théoriques et numériques. En effet, un des buts généraux du projet est d'isoler les phénomènes de base intervenant en ébullition (p.ex. les phénomènes locaux près des lignes de contact, la nucléation, l'influence d'un écoulement, ...), et de les étudier de manière détaillée, afin d'optimiser les codes de simulation destinés à la modélisation du phénomène global et la prédiction des coefficients de transfert d'énergie. [This MAP (Microgravity Application Promotion) research program of the European Space Agency associates several european teams in order to study fundamental and applied aspects of the boiling process. Several microgravity experiments are foreseen, which will allow a deeper understanding of phenomena which, on earth, are generally dominated by buoyancy. In order to prepare these experiments, other investigations are foreseen in the laboratory, in addition to theoretical and numerical studies. Indeed, one of the general goals of the project is to isolate basic phenomena occurring during boiling (i.e. local processes taking place in the vicinity of contact lines, nucleation, forced flows, ...), and to study them in a detailed way, in order to optimize simulation codes dedicated to the modeling of the global process and to the prediction of heat transfer coefficients.]

Microfluidics and micromanipulation: multi-scale applicationsof surface tension (BELSPO PAI Micro-MAST) [Microfluidics and micromanipulation: multi-scale applications of surface tension (BELSPO IAP Micro-MAST)]
The scientific objectives of this IAP network are driven by fundamental questions raised in microfluidics, interfacial science, and micromanipulation. The rational use of surface tension, surface stress and capillary effects in micromanipulation will be applied to a selected number of highly relevant case studies by the network partners, including capillary gripping, capillary filling, capillary alignment, capillary sealing, capillary self-assembly and droplet manipulation (incl. generation and transport). These fundamental questions can be grouped into three categories:1. Fluid statics and dynamics: How much force is applied on solids by menisci and micro-flows in a given geometry? What happens if the solid bends when subject to these forces? Are the interfaces stable and what if not? What is the effect of an electric field? How can the microscopic description of wetting be translated into an adequate boundary condition at the macroscopic level (e.g. contact angle and hysteresis)?2. Surface engineering: How does a contact line move on a rough surface? Can one pattern the surface microscopically to control this motion? How is the motion affected by evaporation, or by the presence of colloid particles in the liquid or at the interface? Do these particles interact with the micro-patterns on the surface? Can one create highly 3D patterns on the surface by using capillary forces (e.g. to bundle nanotubes)?3. Liquid engineering: How to measure the interfacial properties of complex liquids where apart from surface tension a surface viscoelastic response is present? How to infer macroscopic properties from the dynamics at the molecular scale? And how to engineer liquids and tailor them to the requirements arising from applications? Can one make a liquid that is biocompatible, and has a large surface tension and a low viscosity?The proposed multidisciplinary program (involving ULB, ULg, KULeuven, UMons and ESPCI ' Paris) combines forefront research in physics, material science, chemistry and engineering. Its main originality relies in the efforts to enhance the collaboration of the interfacial science, microfluidics and microengineering communities. [The scientific objectives of this IAP network are driven by fundamental questions raised in microfluidics, interfacial science, and micromanipulation. The rational use of surface tension, surface stress and capillary effects in micromanipulation will be applied to a selected number of highly relevant case studies by the network partners, including capillary gripping, capillary filling, capillary alignment, capillary sealing, capillary self-assembly and droplet manipulation (incl. generation and transport). These fundamental questions can be grouped into three categories:1. Fluid statics and dynamics: How much force is applied on solids by menisci and micro-flows in a given geometry? What happens if the solid bends when subject to these forces? Are the interfaces stable and what if not? What is the effect of an electric field? How can the microscopic description of wetting be translated into an adequate boundary condition at the macroscopic level (e.g. contact angle and hysteresis)?2. Surface engineering: How does a contact line move on a rough surface? Can one pattern the surface microscopically to control this motion? How is the motion affected by evaporation, or by the presence of colloid particles in the liquid or at the interface? Do these particles interact with the micro-patterns on the surface? Can one create highly 3D patterns on the surface by using capillary forces (e.g. to bundle nanotubes)?3. Liquid engineering: How to measure the interfacial properties of complex liquids where apart from surface tension a surface viscoelastic response is present? How to infer macroscopic properties from the dynamics at the molecular scale? And how to engineer liquids and tailor them to the requirements arising from applications? Can one make a liquid that is biocompatible, and has a large surface tension and a low viscosity?The proposed multidisciplinary program (involving ULB, ULg, KULeuven, UMons and ESPCI ' Paris) combines forefront research in physics, material science, chemistry and engineering. Its main originality relies in the efforts to enhance the collaboration of the interfacial science, microfluidics and microengineering communities.]



disciplines et mots clés déclarés


Analyse - gestion des transports Environnement et pollution Mécanique appliquée générale Mécanique des fluides Physico-chimie générale Sociologie urbaine Thermodynamique appliquée Transfert de chaleur

absorption coalescence coefficient de transfert de chaleur echangeurs de chaleur ecoulement multi-échelle elasto-capillarité electro-capillarité evaporation films minces fluides complexes flux de chaleur critique instabilités hydrodynamiques interfaces lévitation acoustique ligne de contact microencapsulation microfluidique micromanipulation modélisation théorique et numérique mouillage nucléation tension superficielle turbulence interfaciale