Numerical simulation of electroosmotic flow in microchannels with rough surface

YANG Dayong; LIU Ying

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Numerical simulation of electroosmotic flow in microchannels with rough surface

更新时间：2025-12-10

- Numerical simulation of electroosmotic flow in microchannels with rough surface
- CIESC Journal Issue 10, Pages: 2577-2581(2008)
- 作者机构：
  
  南昌大学机电工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 October 2008，
  
  Published：05 October 2008
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YANG Dayong, LIU Ying. Numerical simulation of electroosmotic flow in microchannels with rough surface[J]. CIESC Journal, 2008, (10): 2577-2581.
DOI：

YANG Dayong, LIU Ying. Numerical simulation of electroosmotic flow in microchannels with rough surface[J]. CIESC Journal, 2008, (10): 2577-2581. DOI：

摘要

电渗流（EOF）广泛应用于微流控芯片中的流体的传输与混合。针对带有粗糙表面的平行板微通道，建立了描述EOF的控制方程，基于有限元分析方法对具有不同粗糙度和EDL厚度的微通道内的EOF进行了数值模拟。结果表明，当EDL厚度接近0.3倍粗糙度大小时，粗糙度对EDL的影响较大，EOF受到粗糙度的阻力作用较为明显，而当EDL厚度相对粗糙度较大和较小时，EOF速度受到粗糙度的影响相对较小；粗糙表面微通道中部EOF速度与相对EDL厚度的关系呈“V”型曲线，EOF平均速度呈“L”型曲线。研究结论对于微通道表面的优化设计以及微流控芯片中流体的精确操控具有一定的参考意义。

Abstract

Electroosmotic flow (EOF) is widely used to transport and mix fluids in microfluidic chipsAiming at the parallelplate microchannel with surface roughness

governing equations describing the EOF were established and the influence of surface roughness and electrical double layer (EDL) on EOF was investigated by using finite element method (FEM)The simulation results indicated that

when the EDL thickness was comparable to 0.3 times of the height of surface roughness

the presence of surface roughness could alter EDL near the surface

and reduce the EOF significantlyWhen the EDL thickness was much smaller or much greater than the height of surface roughness

EOF was less affected by surface roughnessThe relationship between the EOF speed in bulk flow region and the relative EDL thickness was “V-shaped”.

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