Coherent Energy Convergence in Acoustic Cavitation (CECCA): A Phenomenological Framework for Localized Energy Focusing and Industrial Translation

Sonoluminescence is conventionally interpreted through the dynamics of a single acoustically driven bubble, where inertial collapse, extreme compression, rapid thermalization, and partial ionization explain the emission of ultrashort light flashes. That framework remains essential, but it becomes incomplete in structured cavitation fields where bubble populations, acoustic attenuation, geometric confinement, and phase-delayed re-radiated pressure co-evolve. This revised manuscript advances the hypothesis of Coherent Energy Convergence in Acoustic Cavitation (CECCA): under deliberately engineered operating windows, bubble-bubble interaction may become locally constructive rather than purely suppressive, producing transient hotspots whose local energy density exceeds that predicted by effectively independent-bubble models. The present version elevates the hypothesis in two directions. First, it develops a stronger phenomenological mathematical framework tailored to reduced-order modeling, introducing an expanded coupling law, a coherence-dependent sonochemical yield expression, and a dimensionless techno-economic efficiency metric. Second, it translates the physical hypothesis into industrially legible pathways, including high-selectivity sonochemical microreactors, advanced oxidation microreactors for persistent pollutants, liquid-phase plasma-assisted synthesis platforms, and precision biomedical cavitation systems. The manuscript maintains a deliberately conservative scientific posture: CECCA is proposed as a narrow and testable regime, not as a universal behavior of cavitating bubble clouds. Its value lies in whether it can be isolated, measured, falsified, and eventually engineered.