Stable tridimensional bubble clusters in multi-bubble sonoluminescence (MBSL).

摘要: Abstract In the present work, stable clusters made of multiple sonoluminescent bubbles are experimentally and theoretically studied. Argon were acoustically generated trapped using bi-frequency driving within a cylindrical chamber filled with sulfuric acid aqueous solution (SA85w/w). The intensity acoustic pressure field was strong enough to sustain, during several minutes, large number positionally spatially fixed (without pseudo-orbits) over an ellipsoidally-shaped tridimensional array. dimensions ellipsoids studied as function amplitude applied low-frequency ( P Ac LF ) static in fluid 0 ). order explain size shape bubble clusters, we performed series numerical simulations hydrodynamic forces acting bubbles. both cases observed experimental behavior excellent agreement results. revealed that region, mainly determined by null primary Bjerknes force F → Bj ), is defined outer perimeter axisymmetric ellipsoidal cluster centered antinode. role high-frequency component influence secondary discussed. We also investigate effect change concentration dissolved gas on positional spatial instabilities through dimensions. results presented this paper potentially useful for further understanding modeling numerous current research topics regarding multi-bubble phenomena, e.g. multi-frequency fields, transient cavitation, interactions, structure formation processes, atomic molecular emissions equal nonlinear or unsteady fields bubbly media.