【摘要】 聚焦声场对管中球形粒子的声辐射力的研究多局限于理论和数值仿真,限制了其实际应用。为此基于纯滚动动力学原理和高速摄像技术,设计了一套测量管中球形粒子受到聚焦声场的声辐射力的定量测量系统。通过高速摄像技术分析聚甲醛球在充液亚克力管中的运动加速度,结合纯滚动动力学理论计算声辐射力,实现了管中声辐射力的直接测量。实验发现,受限管道内聚焦声波作用下的声辐射力随管内半径、球半径均表现出振荡特性,源于充液管道的声波共振效应。仿真和实验结果明确了管壁几何、球形粒子尺寸及声场强度对管中粒子的声辐射力的影响机制。更多还原

【Abstract】 Previous studies on the acoustic radiation force exerted by focused acoustic fields on spherical particles within pipes have been confined to theoretical and numerical simulations, limiting practical applications. In this study, a quantitative measurement system for determining the acoustic radiation force exerted by a focused acoustic field on spherical particles within a pipe is designed, based on the principle of pure rolling dynamics and high-speed imaging technology. The acceleration of Polyoxymethylene spheres within a fluid-filled acrylic pipe is analyzed using high-speed photography. Combined with pure rolling dynamics theory, the acoustic radiation force is calculated, enabling the direct measurement of acoustic radiation forces in pipes. The experiment found that the acoustic radiation force under the action of focused sound waves in a restricted pipeline exhibits oscillatory characteristics with the radius of the pipe and the radius of the sphere. This oscillation arises from the acoustic resonance effects of the fluid-filled pipe. Simulation and experimental results clarify the influence mechanisms of pipe wall geometry, spherical particle size, and acoustic field intensity on the radiation force experienced by particles in pipes.更多还原