Ristenpart W D, Aksay I A, Saville D A
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Feb;69(2 Pt 1):021405. doi: 10.1103/PhysRevE.69.021405. Epub 2004 Feb 27.
Electric fields generate transverse flows near electrodes that sweep colloidal particles into densely packed assemblies. We interpret this behavior in terms of electrohydrodynamic motion stemming from distortions of the field by the particles that alter the body force distribution in the electrode charge polarization layer. A scaling analysis shows how the action of the applied electric field generates fluid motion that carries particles toward one another. The resulting fluid velocity is proportional to the square of the applied field and decreases inversely with frequency. Experimental measurements of the particle aggregation rate accord with the electrohydrodynamic theory over a wide range of voltages and frequencies.
电场在电极附近产生横向流动，将胶体颗粒扫入密集堆积的组件中。我们根据粒子对电场的畸变所引发的电流体动力学运动来解释这种行为，这种畸变改变了电极电荷极化层中的体力分布。标度分析表明了外加电场的作用是如何产生使粒子相互靠近的流体运动的。所产生的流体速度与外加电场的平方成正比，并随频率成反比减小。在很宽的电压和频率范围内，对粒子聚集速率的实验测量结果与电流体动力学理论相符。
