抄録
When a strong sound wave is attenuated by friction in a unsteady boundary layer adjacent to a solid wall, an acoustic streaming is produced. The acoustic streaming is a steady motion defined by the steady part of second-order velocity caused by non-linearity in a wave motion. A creeping motion generated by a standing wave formed in a pipe by intense sound is known as a typical acoustic streaming which forms dust patterns in a Kundt's tube. And also a second-order pressure distribution is generated in a standing wave. The pressure distribution is shown by deformation of a surface of liquid that partially fills a tube. And when the sound pressure exceeds a certain threshold value, a rupture of liquid surface is occur and fountains are present at sound pressure nodes. This report presents visualization of the fountains and critical values of sound pressure for ruptures of liquid surface.
