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DY: Fachverband Dynamik und Statistische Physik

DY 44: Droplets, Wetting, Complex Fluids, and Soft Matter (joint session DY/CPP)

DY 44.1: Hauptvortrag

Freitag, 21. März 2025, 09:30–10:00, H47

From Cavitation in Soft Matter to Erosion on Hard Matter — •Claus-Dieter Ohl — Institute of Physics, Otto-von-Guericke University, Magdeburg, Germany

Cavitation is the technical term for the formation of empty spaces in a liquid. These unstable voids eventually implode and focus energy on small volumes. Shock wave emission, light emission, erosion, and even nuclear reactions are the consequence of this near singular energy focusing. Here, I will present recent research related to cavitation not only in liquids but also in elastic solids and particularly at the interface of both materials. Singularities developing on the axis of symmetry in non-spherical collapses near boundaries are able to amplify shock waves through self focusing. We think that this mechanism is the primary cause for erosion. In contrast, the non-spherical collapse and shock wave focusing near a tissue allows for the penetration of the tissue with liquid jets at 1000m/s and above. The mechanism at play may be relevant in sports and battle zones, as they could lead to traumatic brain injuries.

Keywords: cavitation; bubble dynamics; flow focusing