Next Article in Journal
Applicability of Artificial Vascularized Liver Tissue to Proteomic Analysis
Next Article in Special Issue
Electroosmotic Mixing of Non-Newtonian Fluid in a Microchannel with Obstacles and Zeta Potential Heterogeneity
Previous Article in Journal
Review of the Newly Developed, Mobile Optical Sensors for Real-Time Measurement of the Atmospheric Particulate Matter Concentration
Previous Article in Special Issue
Generation and Dynamics of Janus Droplets in Shear-Thinning Fluid Flow in a Double Y-Type Microchannel
Article

Electroosmotic Flow of Viscoelastic Fluid through a Constriction Microchannel

1
Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
2
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stéphane Colin
Micromachines 2021, 12(4), 417; https://doi.org/10.3390/mi12040417
Received: 6 February 2021 / Revised: 22 March 2021 / Accepted: 7 April 2021 / Published: 9 April 2021
(This article belongs to the Special Issue Non-Newtonian Microfluidics)
Electroosmotic flow (EOF) has been widely used in various biochemical microfluidic applications, many of which use viscoelastic non-Newtonian fluid. This study numerically investigates the EOF of viscoelastic fluid through a 10:1 constriction microfluidic channel connecting two reservoirs on either side. The flow is modelled by the Oldroyd-B (OB) model coupled with the Poisson–Boltzmann model. EOF of polyacrylamide (PAA) solution is studied as a function of the PAA concentration and the applied electric field. In contrast to steady EOF of Newtonian fluid, the EOF of PAA solution becomes unstable when the applied electric field (PAA concentration) exceeds a critical value for a fixed PAA concentration (electric field), and vortices form at the upstream of the constriction. EOF velocity of viscoelastic fluid becomes spatially and temporally dependent, and the velocity at the exit of the constriction microchannel is much higher than that at its entrance, which is in qualitative agreement with experimental observation from the literature. Under the same apparent viscosity, the time-averaged velocity of the viscoelastic fluid is lower than that of the Newtonian fluid. View Full-Text
Keywords: electroosmosis; microfluidics; elastic instability; non-Newtonian fluid; Oldroyd-B model electroosmosis; microfluidics; elastic instability; non-Newtonian fluid; Oldroyd-B model
Show Figures

Figure 1

MDPI and ACS Style

Ji, J.; Qian, S.; Liu, Z. Electroosmotic Flow of Viscoelastic Fluid through a Constriction Microchannel. Micromachines 2021, 12, 417. https://doi.org/10.3390/mi12040417

AMA Style

Ji J, Qian S, Liu Z. Electroosmotic Flow of Viscoelastic Fluid through a Constriction Microchannel. Micromachines. 2021; 12(4):417. https://doi.org/10.3390/mi12040417

Chicago/Turabian Style

Ji, Jianyu, Shizhi Qian, and Zhaohui Liu. 2021. "Electroosmotic Flow of Viscoelastic Fluid through a Constriction Microchannel" Micromachines 12, no. 4: 417. https://doi.org/10.3390/mi12040417

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop