发表机构
Indian Institute of Technology Guwahati（印度理工学院古瓦哈提分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过实验验证的数值模型，探究了体声流设备中不同形状和材料对比度颗粒间的辐射力，揭示了形状依赖的力反转及颗粒位于节平面内外时材料性质的不同影响，并发现不对称颗粒取向角从0度增至90度时，颗粒间力由最大降至零，为基于形状的微粒声学操控提供了深入理解。
AI 中文摘要
理解球形和非球形颗粒之间的颗粒间辐射力对于声泳中微纳物体的捕获至关重要。大多数理论和数值模型由于球形颗粒的对称性，将其视为相同来处理以估算颗粒间力。在此，我们通过实验验证的数值模型，阐明了三种具有不同形状和材料对比度的颗粒之间的颗粒间辐射力。我们对整个声学设备进行了频率扫描，在二维模型中考虑了粘性效应，以预测系统的共振。随后，将共振频率下获得的声压场拟合为一维正弦波，并用于基于微扰技术和张量积分方法的三维模型中，以计算由于声场的散射和再散射作用在颗粒上的颗粒间力。我们的结果揭示了颗粒间力的形状依赖性反转，即使对于正对比度材料也是如此。我们发现，对于球形颗粒，当颗粒位于节平面上时，颗粒间力与材料性质无关。然而，当颗粒位于节平面之外时，材料对比度和颗粒不对称性显著影响颗粒间力。最后，我们研究了位于节平面外的不对称颗粒的取向对颗粒间辐射力的影响。有趣的是，对于0度的取向角，不对称颗粒的颗粒间力最大，然后随着取向角增加到90度而逐渐减小至零。论文中呈现的详细分析将有助于更好地理解基于形状的微粒声学操控。
英文摘要
Understanding interparticle radiation forces between spherical and nonspherical particles is crucial for the trapping of micro- and nano-objects in acoustophoresis. Most theoretical and numerical models treat spherical particles as identical to estimate interparticle forces, owing to their symmetry. Here, we elucidated interparticle radiation forces between three particles with different shapes and material contrast using experimentally validated numerical models. We performed a frequency sweep of the full acoustic device, accounting for viscous effects in a two-dimensional model, to predict the system's resonance. The pressure field obtained at the resonant frequency was then fitted to a 1D sinusoidal wave and used in a three-dimensional model based on the perturbation technique and tensor integral method to calculate the interparticle forces on the particles due to scattering and re-scattering of the acoustic field. Our results revealed a shape-dependent reversal of interparticle forces, even for positive-contrast materials. We found that for spherical particles, the interparticle forces are independent of material properties when the particles are positioned on the nodal plane. However, material contrast and particle asymmetry significantly affect interparticle forces when particles are placed outside the nodal plane. Finally, we studied the effects of the orientation of the asymmetric particle placed outside the nodal plane on the interparticle radiation forces. Interestingly, for the orientation angle of 0 degrees, the interparticle force is maximum for the asymmetrical particle and then gradually decreases to zero as we increase the orientation angle to 90 degrees. The detailed analysis presented in the paper will facilitate a better understanding of shape-based acoustic manipulation of microparticles.
