UNIFIED DESCRIPTION OF 2ND-ORDER PHENOMENA IN SOUND-WAVES

The generation mechanism of acoustic streaming and radiation pressure are discussed along with the KZK equation, which explains successfully the propagation of finite-amplitude sound waves. The energy loss of a sound beam in a viscous fluid generates the driving force of streamin g which induces mass flow in the beam. The radiation pressure acts on the surface of an object whose acoustic impedance is different from th e fluid. The effect of flow generated around the object on the radiati on pressure is greater when the object is smaller The main purpose of this paper is to describe the unified relationships among waveform dis tortion, acoustic streaming, and radiation pressure. (C) 1998 Scripta Technica.