AC电渗抑制声流的理论与仿真
Theory and simulation of AC electroosmotic suppression of acoustic streaming
摘要：
共振声流体装置中纳米颗粒的声学处理通常受到声流存在的阻碍。对于微米尺寸的声学腔室，这种声流通常通过由声致动产生的粘性剪切应力从流体-固体界面驱动。AC电渗是另一种边界驱动的流动现象，通常用于微流体装置中，用于处理电解质中的颗粒悬浮液。在这里，我们研究如何流可以通过结合超声声学和AC电渗抑制。基于电动力学问题的理论分析，我们能够数值计算在流体-固体界面，这是适合于抑制一个典型的声流模式与一个常设的声学半波的电势的形式。在线性政权，我们甚至推导出一个解析表达式的电渗滑移速度在流体-固体界面，并使用此作为指导原则，在实验上更相关的非线性政权，发生在升高的驱动电压开发模型。我们提出的模拟结果的声流体设备，显示如何实现一个合适的AC电渗结果在抑制所产生的流在设备的大部分由两个数量级。
英文摘要：
Acoustic handling of nanoparticles in resonating acoustofluidic devices is often impeded by the presence of acoustic streaming. For micrometer-sized acoustic chambers, this acoustic streaming is typically driven from the fluid-solid interface by viscous shear-stresses generated by the acoustic actuation. AC electroosmosis is another boundary-driven streaming phenomena routinely used in microfluidic devices for handling of particle suspensions in electrolytes. Here, we study how streaming can be suppressed by combining ultrasound acoustics and AC electroosmosis. Based on a theoretical analysis of the electrokinetic problem, we are able to compute numerically a form of the electrical potential at the fluid-solid interface, which is suitable for suppressing a typical acoustic streaming pattern associated with a standing acoustic half-wave. In the linear regime, we even derive an analytical expression for the electroosmotic slip velocity at the fluid-solid interface, and use this as a guiding principle for developing models in the experimentally more relevant nonlinear regime that occurs at elevated driving voltages. We present simulation results for an acoustofluidic device, showing how implementing a suitable AC electroosmosis results in a suppression of the resulting streaming in the bulk of the device by two orders of magnitude.
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