Phase transition in acoustic propagation in 2D random liquid media

Acoustic wave propagation in liquid media containing many parallel air-fill ed cylinders is considered. A self-consistent method is used to compute rig orously the propagation, incorporating ail orders of multiple scattering. I t is shown that, under proper conditions, multiple scattering leads to a pe culiar phase transition in the acoustic propagation. When the phase transit ion occurs, a collective behavior of the cylinders appears and the acoustic waves are confined in a region of space in the neighborhood of the transmi ssion source. A novel phase diagram is used to illustrate the distinct phas e states in the acoustic propagation.