Financial support : ED IMEP2
Nucleate boiling is a phenomenon appearing in many industrial processes en- abling to exchange a lot of energy by using the latent heat of a heat transfert fluid. The bubble nucleation on the heated wall being dependant on the surface wettability, an optimisation of the heat exchanges requires a good understanding of the bubble dynamics on the wall. The inter- section between the liquid-gas interface and the solid wall, named contact line, as well as the contact angle bewteen the interface and the wall are the main objects of this study. The direct numerical simulation has been chosen to study small spatial and temporal scales. A conservative Level Set method is used, ensuring an accurate reconstruction of the interface and volume of liquid conservation.
The work carried out so far consists in developing a numerical method in the low Mach code YALES2 to simulate the dynamic of a contact line on an unstructured mesh with imposition of a contact angle. This has required the adaptation of the YALES2 two-phase flow solver to keep the accuracy for quantities related with the interface (normal and curvature) close to the wall. This developments have been valided against a synthetic test case.
The next step consists in adding phase change in the numerical tool. A solver dedicated to bubble growth in a superheated liquid already exists, but without the solid wall influence. This coupling will enable the simulation of a growing bubble on a heated wall and the bubble rising due to buoyancy. A modelling work will be necessary to take into account thermal and dynamic phenomena happening close to the contact line which are not resolved on the grid. Finally, the numerical study of the wall properties on heat transfert will be performed.
Publications
Peer-reviewed Publications
2022
2021
Ph.D. Theses
2022
