Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel
1
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Institut Franco-Chinois de l’Energie Nucléaire, Sun Yat-sen University, Zhuhai 519000, China
*
Authors to whom correspondence should be addressed.
Micromachines 2019, 10(12), 881; https://doi.org/10.3390/mi10120881
Received: 28 October 2019
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Revised: 26 November 2019
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Accepted: 10 December 2019
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Published: 15 December 2019
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume III)
In many research works, the fluid medium in electroosmosis is considered to be a Newtonian fluid, while the polymer solutions and biological fluids used in biomedical fields mostly belong to the non-Newtonian category. Based on the finite volume method (FVM), the electroosmotic flow (EOF) of viscoelastic fluids in near-neutral (pH = 7.5) solution considering four ions (K+, Cl−, H+, OH−) is numerically studied, as well as the viscoelastic fluids’ flow characteristics in a microchannel described by the Linear Phan-Thien–Tanner (LPTT) constitutive model under different conditions, including the electrical double layer (EDL) thickness, the Weissenberg number (Wi), the viscosity ratio and the polymer extensibility parameters. When the EDL does not overlap, the velocity profiles for both Newtonian and viscoelastic fluids are plug-like and increase sharply near the charged wall. Compared with Newtonian fluid at Wi = 3, the viscoelastic fluid velocity increases by 5 times and 9 times, respectively, under the EDL conditions of kH = 15 and kH = 250, indicating the shear thinning behavior of LPTT fluid. Shear stress obviously depends on the viscosity ratio and different Wi number conditions. The EOF is also enhanced by the increase (decrease) in polymer extensibility parameters (viscosity ratio). When the extensibility parameters are large, the contribution to velocity is gradually weakened.
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Keywords:
electroosmotic flow; viscoelastic fluid; Linear Phan-Thien–Tanner (LPTT); pH; electrical double layer
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MDPI and ACS Style
Chen, D.; Li, J.; Chen, H.; Zhang, L.; Zhang, H.; Ma, Y. Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel. Micromachines 2019, 10, 881. https://doi.org/10.3390/mi10120881
AMA Style
Chen D, Li J, Chen H, Zhang L, Zhang H, Ma Y. Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel. Micromachines. 2019; 10(12):881. https://doi.org/10.3390/mi10120881
Chicago/Turabian StyleChen, Dilin, Jie Li, Haiwen Chen, Lai Zhang, Hongna Zhang, and Yu Ma. 2019. "Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel" Micromachines 10, no. 12: 881. https://doi.org/10.3390/mi10120881
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