page d'accueil   sommaire  



tel +32 -2-650.30.29, fax +32 -2-650.31.26,
Campus du Solbosch
CP165/62, avenue F.D. Roosevelt 50, 1050 Bruxelles

unités de recherche

Chimie-physique [Physical Chemistry Dept A.S. - Microgravity Research Center] (MRC)


Heat Transfer Prodex [Heat Transfer Prodex]
Heat Transfer [Heat Transfer is an ubiquitous phenomena found in many industrial applications. In some applications like electronic cooling it has become the limiting factor dictating further development. Boiling, evaporation and condensation are used in many engineering fields and, particularly, in space applications. Experimental and theoretical study of various physical phenomena in fluids in the vicinity of the contact line on simple and complex substrates is very important in view of space exploration and the micro-cooling, micro-fluidic devices.We at MRC-ULB are performing work on Loop Heat Pipes for terrestrial and aerospace application. Loop Heat Pipes are passive heat transfer devices able to transfer heat over very long distances (up to 10-15m) with small temperature differences. They have been conceived for space application in the late 70's but are being applied to terrestrial application as well.We are also looking at condensation problems on curvilinear surfaces for application inside advanced heat exchangers with enhanced surfaces.The evaporation of self-rewetting fluids is another strand of research at MRC-ULB. Self-rewetting fluids are mixtures that exhibit an increasing surface tension with temperature and concentration. Since in the course of liquid/vapour phase change, self-rewetting fluids behaviour induces a rather strong liquid inflow (caused by both temperature and concentration gradients) from the cold region (where liquid condensates) to the hot evaporator region, several interesting applications may be envisaged, e.g. the development of advanced wickless heat pipes for utilization in reduced gravity environments.]

Etude et mise au point de dispositif de condensation pour la microgravité. [MAP Condensation (ENCOM-2) is a European Space Agency founded project involving 13 partners (9 academics and 4 industrial) with a budget of over 2m Euro spread over 3 years (2011-2014). ENCOM-2 looks at condensation of liquids (pure and mixtures) on external surfaces, convective condensation inside tubes, and inside heat pipes. ENCOM-2 also looks at the spreading of liquid drops on inclined surfaces.We at MRC-ULB are looking at condensation on curvilinear external surfaces of HFE-7100, measuring the condensate liquid thickness and evaluating the heat transfer coefficient if such advanced fin surfaces. Ground experiments are being carried out on a condensation test cell which will also be used for a parabolic flight campaign with the European Space Agency in May-June 2013.We are also building a test cell using sintered wicks heat pipes with transparent glass tubes which will allow for the first time to unveil the evaporation but especially the condensation phenomena taking place. This research topic is being carried out in collaboration with the university of Bergamo in Italy. This work is of paramount importance for electronic cooling, power electronic (IGBT) cooling, power plant cooling, etc.We will shortly be building a test rig to investigate convective condensation inside mini tubes using pure liquids. In particular we will investigate the effect of surface roughness and of monolayers on the condensation process. This work is in collaboration with the university of Mons in Belgium, LAPLACE in France, and the University of Padova in Italy.]

disciplines et mots clés déclarés

Instrumentation et méthodes en physique Mécanique des fluides Physique de l'état condense [struct., propr. thermiques, etc.] Rayonnement cohérent et holographie

agence spatiale européenne (esa) convection diagnostics optiques heat laboratoire de physique des fluides laboratoire orbital microgravité selene