Shattering a micro-bubble by an expanding bubble

We investigate the interaction and fragmentation of a pulsed laser induced micro-bubble B₁ by another laser induced micro-bubble B₂. The high pressure field associated with the expanding B₂ compresses B₁, associated with an axial jet on B₁ through inertia dominated Richtmyer-Meshkov surface instability. The further interplay of the penetrating jet and the pressure field of the forward flow surrounding B ₁ induce complicated patterns in the next re-expanding stage of B₁, which leads to different spherical bubbles of different sizes at the end of the third collapsing phase of B₁. The backward interaction from B₁ also induces backward jetting and entanglement on B ₂. For two symmetric bubbles generated at the same time, a thin lubrication liquid layer can be formed between the two bubbles, which can be unstable at the large laser energy. For two bubbles formed at slight phase delay at short distance, the impact of the second expansion bubble leads to the formation of multiple jets on the collapsing bubble B₁.