Vabilo na predavanje

»Cavitation near boundaries, in boundaries and due to boundaries«

ki ga bo izvedel

prof. dr. Claus-Dieter Ohl

Predavanje bo v četrtek, 6. 4. 2023, ob 15.30 v predavalnici III/3A

Povzetek:

The phase change from liquid to vapor may or may not lead to fast fluid flows. In boiling, the bubbles – once formed – remain peaceful, yet when nucleated due to a transient pressure reduction they probe extreme conditions of matter during their collapse. While the spherical symmetry with its singular energy focusing ability has attracted a lot of attention, already slightest disturbances hampers the converging flow. What remains are non-spherical bubbles. In this this talk I will provide some overview on these particular flows that remain to be very forceful. The range of scenarios I will discuss are the bubble collapse near a simple and some complex rigid boundaries, cavitation in elastic solids, and cavitation created by surface waves on boundaries. The emphasis is on experiments, yet some of the phenomena are so fast and occur on such small volumes that numerical simulations are the last hope to understand what really goes on.

O predavatelju:

Prof. Claus-Dieter Ohl has graduated with a PhD in physics in 1998 in the group of Prof. Werner Lauterborn from Göttingen University. He then spent time as a postdoc with Prof. Andrea Prosperetti, at Johns Hopkins University, Prof. Detlef Lohse at Twente University, studying mostly bubbles in liquids with experiments. From 2005 he became group leader on bioeffects of cavitation as VIDI fellow. In 2007 he joined as Assistant Professor Nanyang Technology University in Singapore. The research remained with vapor and gas bubbles, but it also extended towards the surface nanobubbles. In 2021 Prof. Ohl was tenured and he joined in 2017 the Otto-von-Guericke University in Magdeburg as full professor. Current interest are cavitation in soft material, bulk nanobubbles, and surface waves.

Vljudno vabljeni!

prof. dr. Rok Petkovšek           prof. dr. Matevž Dular            prof. dr. Mihael Sekavčnik, dekan