Tropfenaufprall auf heiße Oberflächen

• Antragstellerin: Dr. Kirsten Harth
• Fachliche Zuordnung: Statistische Physik, Nichtlineare Dynamik, Komplexe Systeme, Weiche und fluide Materie, Biologische Physik
• Förderung: Förderung von 2017 bis 2019
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 394307351

• Erstellungsjahr: 2020

Zusammenfassung der Projektergebnisse

Droplet dynamics was experimentally investigated in different configurations, with focus on impact on hot plates at ambient and reduced pressure. TIR was extended to investigate the solidification in direct vicinity of the substrate during spreading and impact on cold surfaces. Experimental methods were mainly high-speed shadowgraphy, frustrated total internal reflection (in Twente) and synchrotron X-ray imaging (at Argonne Ntnl. Lab, USA). Beyond hot substrates, investigations of solidification processes in spreading drops on cold substrates and coalescence processes were investigated. New methods were learnt and developed. In particular, the unforeseen highspeed X-ray measurements still contain a multitude of insights. The development of micro-electronic surface temperature sensors and investigations of impact on oily / deformable surfaces shall be continued in follow-up research.

Projektbezogene Publikationen (Auswahl)

• From Bouncing to Floating: The Leidenfrost Effect with Hydrogel Spheres, Phys. Rev. Lett., 121, 048001 (2018)
  S. Waitukaitis, K. Harth, M. van Hecke
  
• Drop Impact on Hot Plates: Contact times, Lift-off and the Lamella Rupture (2020)
  S. H. Lee, K. Harth, M. Rump, M. Kim, D. Lohse, K. Fezzaa, J. H. Je
  
• Fast-freezing kinetics inside a droplet impacting on a cold surface, Proc. Ntnl. Acad. Sci. USA, 117, 2788 (2020)
  P. Kant, R. B. J. Koldeweij, K. Harth, M. A. J. van Limbeek, D. Lohse