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Electrokinetic instability in microchannel viscoelastic fluid flows with conductivity gradients

机译：微通道粘弹性液中的电动不稳定性与电导梯度流动

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摘要

Electrokinetic instability (EKI) is a flow instability that occurs in electric field-mediated microfluidic applications. It can be harnessed to enhance sample mixing or particle trapping but has to be avoided in particle separation. Current studies on EKI have been focused primarily on the flow of Newtonian fluids. However, many of the chemical and biological solutions exhibit non-Newtonian characteristics. This work presents the first experimental study of the EKI in viscoelastic fluid flows with conductivity gradients through a T-shaped microchannel. We find that the addition of polyethylene oxide (PEO) polymer into Newtonian buffer solutions alters the threshold electric field for the onset of EKI. Moreover, the speed and temporal frequency of the instability waves are significantly different from those in the pure buffer solutions. We develop a three-dimensional preliminary numerical model in COMSOL, which considers the increased viscosity and conductivity as well as the suppressed electroosmotic flow of the buffer-based PEO solutions. The numerically predicted threshold electric field and wave parameters compare favorably with the experimental data except at the highest PEO concentration. We attribute this deviation to the neglect of fluid elasticity effect in the current model that increases with the PEO concentration. Published under license by AIP Publishing.
机译：电动不稳定（EKI）是在电场介导的微流体应用中发生的流动不稳定性。它可以利用以增强样品混合或颗粒捕获，但必须在颗粒分离中避免。关于EKI的目前的研究主要集中在牛顿流体的流动。然而，许多化学和生物解决方案表现出非牛顿特征。该工作介绍了通过T形微通道的电导率梯度流动粘弹性流体中EKI的第一个实验研究。我们发现将聚环氧乙烷（PEO）聚合物添加到牛顿缓冲溶液中，改变了EKI发作的阈值电场。此外，不稳定性波的速度和时间频率与纯缓冲液中的速度显着不同。我们在COMSOL中开发了三维初步数值模型，其考虑了基于缓冲基的PEO溶液的增加的粘度和电导率以及抑制的电渗流。数值预测的阈值电场和波参数与除了最高PEO浓度之外的实验数据有利地比较。我们将这种偏差归因于忽略与PEO浓度增加的当前模型中的流体弹性效应。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共9页
  • 作者

    Song Le; Jagdale Purva; Yu Liandong; Liu Zhijian; Li Di; Zhang Cheng; Xuan Xiangchun;

  • 作者单位

    Hefei Univ Technol Sch Instrument Sci &

    Optoelect Engn Hefei 230009 Anhui Peoples R China;

    Clemson Univ Dept Mech Engn Clemson SC 29634 USA;

    Hefei Univ Technol Sch Instrument Sci &

    Optoelect Engn Hefei 230009 Anhui Peoples R China;

    Clemson Univ Dept Mech Engn Clemson SC 29634 USA;

    Clemson Univ Dept Mech Engn Clemson SC 29634 USA;

    Univ West Florida Dept Mech Engn Pensacola FL 32514 USA;

    Clemson Univ Dept Mech Engn Clemson SC 29634 USA;

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  • 正文语种 eng
  • 中图分类 流体力学;
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