séminaire Juliette Pierre

Author: Juliette Pierre
Time: 11H00
Language: French
Place: Conference Room at LabTAU

Abstract:   Acoustic signature of hydrodynamics events

Gas-liquid systems are ubiquitous in industrial, food, biological or geophysical contexts. The popping noise of a bursting bubble, the crackle sounds of ageing foams, the whistling of nucleating water, the fizzing of champagne, the drumming of rain and the thud of degassing volcano magmas evidence the radiation of sound by these violent interfacial hydrodynamic events.

Such events evolve according to various processes occurring at several different length scales and over several different time scales. These non-equilibrium systems are mainly studied using fast optical imaging, which allows us to follow the reconfiguration of certain liquid-gas interfaces over time. By adding acoustic measurements, we also have access to the pressure field generated.

In this presentation I will present our recent investigations about the spatio-temporal acoustical signature of violent hydrodynamic events such as : bubble bursting, drop impact or film bursting. By combining the use of acoustic sensors, fast optical imaging and theoretical modeling, we aim to monitor and characterise these violent events and elucidate the physical mechanisms at play in their existence and their evolution.