Presentation Information
[15p-PB2-3]Frequency Changes of Interacting Self-Oscillating Bubbles
〇(B)Nao Kokubo1, Natsuhiko Yoshinaga1 (1.Future Univ. Hakodate)
Keywords:
fluid,heat,simulation
Oscillate boiling (OB) is a nonlinear, self-sustained bubble oscillation induced by localized heating (e.g., laser irradiation) that achieves high heat transfer without external periodic forcing. In real cooling devices, bubbles appear in clusters and interact through pressure waves. We study how such acoustic interaction alters the oscillation frequency using a two-bubble model based on the Keller–Miksis equation with heat input and thermal effects. The inter-bubble distance and initial radii are swept, radius signals are simulated, and dominant spectral peaks are extracted within a fixed FFT window. Comparing coupled and uncoupled cases (direct coupling on/off) yields the frequency shift Δf(d), revealing systematic detuning as separation decreases and as bubble size changes. These results offer a metric to assess interaction strength and may help in choosing appropriate spacing between OB sites to support stable operation and efficient heat removal.