Dresden 2020 – wissenschaftliches Programm
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CPP 106.4: Vortrag
Freitag, 20. März 2020, 10:30–10:45, ZEU 260
Condensation frosting on lubricant impregnated surfaces — •Lukas Hauer1, Lou Kondic2, and Doris Vollmer1 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Department of Mathematical Sciences, NJIT, Newark, USA
In many technical applications the formation of frost and ice displays a hazard to the steady functionality of devices. This motivates the development of new materials to tackle the reduction of icing on surfaces. Understanding the nature of frosting and icing is indispensable to this effort. While icing on surfaces is commonly studied by localized nucleation mechanisms, the formation of frost is comparable more complicated. Condensation frost is characterized by multi-step and multi-physical phenomenon. The formation of condensate droplets, percolation, and frost front propagation is an inherently stochastic process. Despite its ubiquitous nature, a quantitative model for frost growth on surfaces remains elusive. Lubricant impregnated surfaces are known for improved anti-icing properties. They experience lower ice drop adhesion and allegedly delayed surface frosting. We show that frost formation can induce immensely strong capillary forces that could result in surface damage, lubricant depletion and the loss of anti-icing properties. Laser scanning confocal microscopy enabled us to monitor the dynamic lubricant migration during condensation frosting on micro-structured surfaces. We present a model of the lubricant migration, utilizing lubrication theory. This work serves to improve understanding of lubricant dynamic during condensation frosting, providing future roadmaps towards the future design of anti-icing surfaces.