Description du projet
Élucider le mécanisme d’ébullition nucléée
Pouvoir exploiter en toute sécurité des structures de grande envergure qui génèrent des flux de chaleur élevés, comme les avions hybrides, les drones et les satellites, requiert des solutions de refroidissement efficaces. L’ébullition nucléée permet de refroidir les composants et les systèmes par transfert d’énergie: des bulles se forment et se détachent d’une surface chauffée pour se mêler à un liquide environnant plus frais. Le projet BOIL-MODE-ON, financé par l’UE, va utiliser des modèles informatiques pour mieux comprendre le mécanisme qui se cache derrière la formation et le mouvement des bulles lors de l’ébullition. L’étude mettra en évidence les effets de la mouillabilité en surface et des gaz dissous, deux des sujets les plus complexes dans ce domaine. Des campagnes expérimentales viendront compléter les travaux théoriques. Le contrôle précis de certains paramètres qui influencent le rendement des chaudières permettra de mettre en œuvre dans la pratique de l’ébullition nucléée.
Objectif
Cooling efficiency is of the upmost importance in several crucial technological applications, e.g. fuel cells and battery cooling, hybrid airplanes, drones and satellite thermal management. They have a value of several billions dollars around the world, with a critical contribution to global CO2 production. A promising approach to cope with the always higher heat fluxes requested is represented by phase changing systems which exploit the large latent heat associated with phase change to remove the heat from the hot surface. A robust and effective strategy is to deploy boiling. The basic underlying idea is simple: form vapour bubbles in a liquid in contact with the hot surface and evacuate them through a condenser. Its implementation, however, faces a number of challenges and requires solution to several fundamental problems. In any practical application the boiler efficiency depends on parameters, such as the frequency of bubble nucleation, their size, and the release rate from the hot surface. However, how to precisely control them is still not clear. BOIL-MODE-ON aims at addressing the underlying mechanism of bubble inception and departure during boiling, defining possible new routes and solutions both on the modelling and the practical implementation side. Dr. Magaletti will apply a cutting-edge methodology he developed in the context of cavitation phenomena, based on a mesoscale numerical modelling of the liquid-vapour system embedding thermal fluctuations. It will shed light on the effects of surface wettability and dissolved gas, which are two of the most complex and not yet understood topics in this field. A specific campaign of experiments will complement and support the analysis. The recognised experience of Prof. Marengo, who will supervise this project, on the experimental techniques for boiling guarantees the highest level of synergy and knowledge transfer with the applicant, further developing his research skill-set and enhancing his career prospective.
Champ scientifique
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringsatellite technology
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringroboticsautonomous robotsdrones
- engineering and technologyenvironmental engineeringenergy and fuelsfuel cells
Programme(s)
Régime de financement
MSCA-IF-EF-ST - Standard EFCoordinateur
BN2 4AT Brighton
Royaume-Uni