Electrokinetic Lift: Observations and Comparisons with Theories
Electrokinetic Lift: Observations and Comparisons with Theories
复制标题
动电升力：观察以及与理论的比较
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
T. V. D. Ven
中科院分区：
文献类型：
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作者：
X. Wu;P. Warszyński;T. V. D. Ven
本文提出了一种新的实验技术，用于研究作用在极性液体中与表面平行运动的带电粒子上的电动升力。它是基于对壁面剪切流中靠近壁面的粒子正常运动的观察。实验结果表明，剪切力随剪切速率的增大和溶液电导率的降低而增大。这些发现与先前报道的数据一致，并证实了由于其量级小而难以检测到的电动升力的存在。实验结果与各种理论预测结果进行了比较。比较表明，大多数电动力学理论计算的升力是不正确的。应用最近发展的两种新理论来解释数据，并发现与实验结果相当吻合。
A new experimental technique has been developed to study the electrokinetic lift force acting on an electrically charged particle moving parallel to a surface in a polar liquid. It is based on the observation of the normal movement of a particle close to a wall in a wall shear flow. The experimental results show that the force increases with increasing shear rate and decreasing solution conductivity. These findings are consistent with previously reported data and confirm the existence of an electrokinetic lift force that is difficult to detect because of its small magnitude. The experimental results are compared with various theoretical predictions. The comparisons show that the lift force calculated by most electrokinetic theories is not correct. Two new recently developed theories were applied to interpret the data, and reasonably good agreement with experimental results was found.