Presentation Information
[11a-C310-8]Bifurcation of laser-excited self-oscillating bubbles and analysis of inter-bubble synchronization via phase reduction
〇(M1)Nao Kokubo1, Natsuhiko Yoshinaga1 (1.Future Univ. Hakodate)
Keywords:
self-oscillating bubbles,fluid,Numerical Analysis
Laser-heated microbubbles on an absorbing substrate are active elements for microfluidics, whose streaming transports and mixes fluid. Under steady illumination it self-oscillates, and bubbles interact and synchronize; understanding the onset and synchronization should enable their control. We model the coupled radius-temperature dynamics (Keller-Miksis plus a thermal energy balance) and treat the self-oscillation as a Hopf bifurcation, smoothing the heating threshold so that standard bifurcation analysis applies. Raising the laser power triggers it, and the onset occurs at a nearly constant drive parameter D lumping the controllable laser power and ambient temperature, regardless of structure, predictable from control parameters alone. Using the single-bubble phase response we reduce two acoustically coupled bubbles to their phase difference; near the bifurcation this agrees with direct simulation. The far in-phase synchronization in experiments is not yet reproduced (future work).