Simulation of Electroosmotic and Pressure-Driven Mixed Flow of Viscoelastic Fluids in Converging-Diverging Tubes

DU Changlong; XIA Weihao; YANG Jiajie; LI Jie

doi:10.21656/1000-0887.430255

Volume 44 Issue 6

Jun. 2023

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Article Navigation > Applied Mathematics and Mechanics > 2023 > 44(6): 643-653

DU Changlong, XIA Weihao, YANG Jiajie, LI Jie. Simulation of Electroosmotic and Pressure-Driven Mixed Flow of Viscoelastic Fluids in Converging-Diverging Tubes[J]. Applied Mathematics and Mechanics, 2023, 44(6): 643-653. doi: 10.21656/1000-0887.430255

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Simulation of Electroosmotic and Pressure-Driven Mixed Flow of Viscoelastic Fluids in Converging-Diverging Tubes

doi: 10.21656/1000-0887.430255

School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, P.R.China

Received Date: 2022-08-08
Rev Recd Date: 2023-02-15
Publish Date: 2023-06-01

Abstract

Abstract

The electroosmotic and pressure-driven mixed flow was widely used in various biochemical microfluidic fields, where the elastic instability of the viscoelastic fluid cannot be ignored. A viscoelastic fluid was used to numerically simulate electroosmotic and pressure-driven mixed flow in a 10:1:10 microchannel converging-diverging tube. The effects of different pressures and different polymer concentrations on the fluid flow were studied, and the superposition principle for the velocity distributions of Newtonian fluids and viscoelastic fluids in converging-diverging tubes was analyzed. The results show that, the reverse pressure brings the viscoelastic fluid into higher instability, which makes the inlet vortex larger by 25 μm for every 1 Pa pressure increase. The positive pressure makes the eddy current smaller. For a relatively small reverse pressure, the inlet vortex increases with the polymer concentration and tends to be stable gradually. For a relatively large reverse pressure, the vortex size first increases and then decreases with the polymer concentration.
- non-Newtonian fluid,
- microfluidic channel,
- superposition principle,
- instability,
- electroosmotic flow

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References(22)

References

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