论文标题
关于声场下不均匀流体的稳定性
On the stability of inhomogeneous fluids under acoustic fields
论文作者
论文摘要
在这项工作中，我们介绍了经受稳态场的不均匀流体的稳定理论。从第一原则开始，建立了稳定性标准，该标准是针对由平面界面分离的两种不同声阻抗的流体。通过稳定理论和数值模拟，我们表明，在存在界面张力的情况下，当声力克服了界面张力力时，高阻抗流体从抗节点迁移到节点，这与最近的微通道实验一致。此外，我们建立了一个表征稳定（bo_a <1）和搬迁（bo_a> 1）制度的声键号。值得注意的是，发现可以通过增加通道高度来大大降低搬迁所需的临界声能密度，这可以帮助设计处理不可交通流体的大量流体微通道设备。
In this work, we present the stability theory for inhomogeneous fluids subjected to standing acoustic fields. Starting from the first principles, the stability criterion is established for two fluids of different acoustic impedance separated by a plane interface. Through stability theory and numerical simulations we show that, in the presence of interfacial tension, the relocation of high-impedance fluid from anti-node to node occurs when the acoustic force overcomes interfacial tension force, which is in agreement with recent microchannel experiments. Furthermore, we establish an acoustic Bond number that characterizes stable (Bo_a < 1) and relocation (Bo_a > 1) regimes. Remarkably, it is found that the critical acoustic energy density required for relocation can be significantly reduced by increasing the channel height which could help design acoustofluidic microchannel devices that handle immiscible fluids.
