Bubble Acoustics and the Sound of Water Drops

date October 21, 2016
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Friday, October 21, 2016
4:00 p.m. in ETC 4.150

Dr. Kyle S. Spratt
Applied Research Laboratories
The University of Texas at Austin
www.arlut.utexas.edu

The acoustic properties of gas bubbles in liquids has become a prevalent field of study in the last century due to the large number of practical applications in both underwater acoustics and biomedical acoustics. Given the myriad practical applications, it is interesting to note that some of the earliest papers written on the subject of bubble acoustics were motivated by a number of physicists’ sheer curiosity about the sound that is generated by a water drop as it splashes into a pool of water. In this talk we will review the work done in the early twentieth century on the physics of water drop splashes that led directly to M. Minnaert’s 1933 paper deriving the resonance frequency of a gas bubble oscillating in an incompressible liquid, as well as some subsequent splash-related bubble research. Along the way we will discuss the basic physics of bubble oscillations by considering the sound scattered by a large air bubble in water.