Abstract:
Based on the nonlinear KZK (khokhlov-zabolotskaya-kuznetsov) equation, the expression and distribution of sound field are obtained. When the axis distance is beyond the Raileigh distance, the sound pressure will minimize to a certain limit value, which shows the sound field is a plane wave in that range. The CBS (Cone-like bubble structure) occurs in the area where the pressure is higher and the grads of pressure is not zero. The bubbles′ radial vibration has an effect on the distribution of sound field. The mutual Bjerknes forces between bubbles adjust the distribution of bubbles, which causes CBS.
