C03: Condensation of Water on Superamphiphobic Surfaces
Efficient and space-saving condensation of water vapour is important for many applications, including the extraction of fresh water from humid air and for high condensation rates in heat exchangers. The efficiency of commonly used condensers is limited by the slow discharge of already condensed liquid, which wets the condenser surface as a film.
The research focus of the project is the dropwise condensation on hydrophobic surfaces. Droplets flow off easily and effectively on sufficiently inclined hydrophobic surfaces and thus quickly expose condensation surface. However, the necessary coatings are either thermally insulating themselves or are not stable for a sufficiently long time.
The long-term goal of the project is to optimize the condensation rate and heat transport during condensation by a combination of hydrophobic coatings and substrate structuring. For this purpose, it is first of all important to better understand the basic processes during condensation, i.e. to be able to predict them quantitatively. The question is: How do hydrophobic coatings in combination with the substrate topography influence the growth, coalescence and the detachment / rolling of the condensing droplets?