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arXiv 1011.2995physics.flu-dyn
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囊泡电流体力学

Vesicle electrohydrodynamics

Jonathan T. Schwalbe, Petia M. Vlahovska, Michael J. Miksis

摘要:

本文提出了一种小振幅微扰分析方法,用以描述均匀电场对简单剪切流中脂双层囊泡动力学的影响。所有的介质都被视为泄漏介质,流体运动由斯托克斯方程描述。通过平衡施加在膜上的电应力、流体动力应力、弯曲应力和张应力来获得瞬时囊泡形状。我们发现,在环境剪切流的情况下,它是可能的,一个逐步均匀的直流电场可能会导致囊泡的形状演变从扁圆到扁长随着时间的推移,如果封装的流体是比悬浮液导电。对于环境剪切流中的囊泡,电场会抑制翻滚运动,从而导致稳定的坦克踩踏状态。

英文摘要:

A small amplitude perturbation analysis is developed to describe the effect of a uniform electric field on the dynamics of a lipid bilayer vesicle in a simple shear flow. All media are treated as leaky dielectrics and fluid motion is described by the Stokes equations. The instantaneous vesicle shape is obtained by balancing electric, hydrodynamic, bending, and tension stresses exerted on the membrane. We find that in the absence of ambient shear flow, it is possible that an applied step--wise uniform DC electric field could cause the vesicle shape to evolve from oblate to prolate over time if the encapsulated fluid is less conducting than the suspending fluid. For a vesicle in ambient shear flow, the electric field damps the tumbling motion leading to a stable tank-treading state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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