Simultaneous High-Speed Observation in Two Directions and Impulsive Pressure Measurement for Bubble Collapse near a Rigid Wall

Abstract

Simultaneous high-speed observations in two-directions and pressure measurements using a Fiber Optic Probe Hydrophone (FOPH) are conducted to investigate the collapse of a laser-induced bubble near a rigid wall and the corresponding impulsive pressure distribution. It is shown that the measured pressure distributions next to the wall and the observations of top and side views reveal a strong correlation with the pitting damage due to the bubble collapse by Philipp and Lauterborn (1998). The results also show that asymmetric bubble collapse is observed at the second collapse.

The asymmetric toroidal bubble collapse causes the asymmetric pitting damage distribution.