Descrizione del progetto
Chiarire il meccanismo di ebollizione nucleata
Il funzionamento sicuro di grandi strutture che emettono flussi di calore elevati, quali aeroplani ibridi, droni e satelliti, dipende da soluzioni di raffreddamento efficienti. Quando le bolle si formano e si staccano da una superficie riscaldata a un liquido circostante più freddo, l’ebollizione nucleata è in grado di raffreddare componenti e sistemi attraverso il trasferimento di energia. Il progetto BOIL-MODE-ON, finanziato dall’UE, utilizzerà modelli informatici per approfondire il meccanismo sottostante all’avvio e all’allontanamento delle bolle durante l’ebollizione. Lo studio rivelerà gli effetti della bagnabilità della superficie e del gas disciolto, ovvero due degli argomenti più complessi nel campo. Campagne sperimentali completeranno il lavoro teorico. Il controllo preciso di alcuni parametri che influiscono sull’efficienza della caldaia consentirà l’implementazione pratica dell’ebollizione nucleata.
Obiettivo
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.
Campo scientifico
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringsatellite technology
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringroboticsautonomous robotsdrones
- engineering and technologyenvironmental engineeringenergy and fuelsfuel cells
Programma(i)
Argomento(i)
Meccanismo di finanziamento
MSCA-IF-EF-ST - Standard EFCoordinatore
BN2 4AT Brighton
Regno Unito