Ultrasound-assisted processing of particulate phase in a host fluid relies on the induced acoustic force field. Understanding the agglomeration phenomenon in the particulate phase under acoustic forces will provide better insight about the acoustophoresis quality and a way to design a well-controlled process. In this work, a dynamic model consisting of acoustic and hydrodynamic forces is proposed for tracking the motion of micro-spheres under ultrasound fields with planar and non-planar wave fronts. The agglomeration of particles at the nodal plane was simulated taking into account the contact and collisions between spheres. The numerical simulations were conducted for both sound hard and compressible spheres to investigate the behaviors of single and multiple-phase particle populations. For the case of a plane standing-wave, the interaction between solid-bubble allows the solid particles to stay at the velocity node which is their unstable equilibrium location. With a Bessel standing wave as a non-planar pressure field, the agglomeration patterns of particles are generally different from the case of plane standing wave, which implies the significance of the particle tracking simulations for predicting the agglomeration patterns and locations under ultrasound fields with arbitrary wave fronts.

宿主流体中颗粒相的超声辅助处理依赖于感应声场。了解在声力作用下颗粒相中的团聚现象将提供关于声泳质量的更好见解，以及设计良好控制过程的方法。在这项工作中，提出了一个由声学和流体动力组成的动力学模型，用于跟踪具有平面和非平面波阵面的超声场下微球的运动。考虑到球体之间的接触和碰撞，在节点平面上模拟了粒子的聚集。对声硬和可压缩球体进行了数值模拟，以研究单相和多相粒子总体的行为。对于平面驻波，固体气泡之间的相互作用使固体颗粒停留在速度节点上，该速度节点是它们不稳定的平衡位置。以贝塞尔驻波为非平面压力场时，粒子的团聚模式通常与平面驻波的情况不同，这暗示了粒子跟踪模拟对于预测任意场下超声场下的团聚模式和位置​​的重要性。波前。