The Electro-Elastic Instability of Viscoelastic Fluid in a Microchannel with Obstacles Under Heterogeneous Surface Potential

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE Microgravity Science and Technology Pub Date : 2024-07-02 DOI:10.1007/s12217-024-10127-7
Guofang Li, Xinhui Si, Botong Li, Jing Zhu, Limei Cao
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Abstract

In this paper, the Electro-elastic instability(EEI) of an Oldroyd-B fluids flow the microchannel with the obstacles and heterogenous surface charged is studied. The changes in fluid flow are presented by considering three different ranges of Weissenberg numbers(Wi), the expansion lengths \(\textrm{EL}\), and the asymmetric potential distributions. Under the combined effects of heterogeneous surface potential and elastic stresses, not only the vortices but also lip vortices are generated near the obstacles. At lower Weissenberg numbers, the stable and symmetric flow field is observed. As Wi increases, it is worth noting that the flow field becomes unstable and chaotic due to the enhanced electro-elastic instability. But the asymmetry of the velocity diminishes as \(Wi>10\). In addition, the presence of different vortex dynamics is observed as the Wi varies, such as the lip vortices, angular vortices, and oscillating lip vortices. Further, the flow of fluid at different expansion ratios is investigated. With the decrease of expansion lengths \(\textrm{EL}\), the backflow and asymmetry are reduced, the lip vortex disappears and then the angular vortex appears. Finally, by increasing the upper zeta potential \((\zeta _{\textrm{w}})\) of the obstacles, the mixing efficiency is improved. The research results may be helpful to the electrodynamic transport of viscoelastic fluids in porous media and the analysis of micromixers for industrial applications.

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带障碍物的微通道中粘弹性流体在异质表面电位下的电弹性不稳定性
本文研究了带障碍物和异质表面带电的奥尔德罗伊德-B流体在微通道中流动的电弹性不稳定性(EEI)。通过考虑三种不同范围的魏森伯格数(Wi)、膨胀长度(textrm{EL}\)和非对称势分布,展示了流体流动的变化。在异质表面势和弹性应力的共同作用下,障碍物附近不仅会产生漩涡,还会产生唇形漩涡。在较低的魏森堡数下,可以观察到稳定的对称流场。值得注意的是,随着 Wi 的增加,由于电弹性不稳定性增强,流场变得不稳定和混乱。但速度的不对称性随着 \(Wi>10\) 的增大而减小。此外,随着 Wi 的变化,还观察到不同的涡旋动力学,如唇涡、角涡和振荡唇涡。此外,还研究了不同膨胀比下的流体流动。随着膨胀长度 \(\textrm{EL}\)的减小,回流和不对称现象减少,唇涡消失,然后出现角涡。最后,通过增加障碍物的上zeta电位((\zeta _{\textrm{w}}),提高了混合效率。这些研究成果可能有助于粘弹性流体在多孔介质中的电动传输和工业应用中的微搅拌器分析。
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来源期刊
Microgravity Science and Technology
Microgravity Science and Technology 工程技术-工程:宇航
CiteScore
3.50
自引率
44.40%
发文量
96
期刊介绍: Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology
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