Seminar | Cavitation near boundaries, in boundaries and due to boundaries by Professor Claus-Dieter Ohl

You're invited to join the Department of Mechanical and Mechatronics for a seminar by Professor Christopher C-D Ohl a Professor and Head in the Department for Soft Matter, Institute for Physics at the University of Magdeburg, Germany

Abstract

The phase change from liquid to vapour 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 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 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 in such small volumes that numerical simulations are the last hope to understand what really goes on.

Biographical Sketch

Prof Claus-Dieter Ohl was infected by Prof Lauterborn with the bubble virus and defended his PhD 1998 at the University of Göttingen. He received training during his postdoctoral stints from Prof Prosperetti at the very Johns Hopkins University and Prof Lohse at Twente University. In 2004 he was awarded the VIDI fellowship and in 2007 he was appointed at the Nanyang Technology University as Assistant Professor and in 2012 as Associate Professor. Over the years his lab worked on cavitation in microfluidics, the physics of bubble cleaning, photoacoustics and time reversal acoustics, and on the dynamics of surface nanobubbles. Since 2018 he is full Professor at the University of Magdeburg at the Institute of Physics.