According to the effect of viscosity on sound action in liquid, the sound propagation is researched in the mixture medium of liquid and bubbles. The sound propagation equation has been resulted from the three basic sound equations, in which the bulk ratio of bubble is one of the crucial factors of sound field. Furthermore, the expressions of acoustic velocity and attenuation coefficient are deduced. The results show that acoustic velocity decreases and attenuation coefficient increases when there are bubbles in liquid.

sound propagation; acoustic velocity; acoustic attenuation coefficient