Numerical Prediction of Transient Electrohydrodynamic Instabilities Under an Alternating Current Electric Field and Unipolar Injection

Overview

Journal Heliyon

Specialty Social Sciences

Date 2023 Jan 26

PMID 36699279

Authors

Chu-Tong Zhou

Zhen-Ze Yao

Di-Lin Chen

Kang Luo

Jian Wu

Hong-Liang Yi

Affiliations

Soon will be listed here.

Abstract

In this paper, a direct numerical simulation (DNS) of dielectric fluid flow subjected to unipolar injection under an alternating current (AC) electric field is carried out. The effect of frequency of pulsed direct current (PDC) and AC on the transient evolution of electroconvection and their subcritical bifurcations are investigated in details. Electroconvection under PDC or AC tends to exhibit oscillating flow due to the periodic boundary condition of charge density and potential compared to the direct current (DC) case. The results demonstrate that under the PDC field, the linear criterion decreases with increasing frequency, while the nonlinear stability criterion is hardly affected. Under the AC field, a critical frequency = 0.0316 is found, which separates electroconvection into two typical flow regimes-periodic flow regime ( < ) and inhibited flow regime ( )-depending on whether free charges can reach the collector electrode before electric field inversion. AC-electrohydrodynamics (EHD) systems promote various flow patterns with relatively lower voltage regimes than DC-EHD systems. These mechanisms of electroconvection under the PDC/AC field offer unique possibilities for fluid flow control in biological EHD-driven flow and portable EHD applications.

References

Silva R, Rauf S, Dong M, Chen L, Bagci H, Salama K . 3D Concentric Electrodes-Based Alternating Current Electrohydrodynamics: Design, Simulation, Fabrication, and Potential Applications for Bioassays. Biosensors (Basel). 2022; 12(4). PMC: 9028247. DOI: 10.3390/bios12040215. View

Wang M, Kang Q . Electrokinetic transport in microchannels with random roughness. Anal Chem. 2009; 81(8):2953-61. DOI: 10.1021/ac802569n. View

Guan Y, Novosselov I . Two Relaxation Time Lattice Boltzmann Method Coupled to Fast Fourier Transform Poisson Solver: Application to Electroconvective Flow. J Comput Phys. 2019; 397. PMC: 6711381. DOI: 10.1016/j.jcp.2019.07.029. View

Stout R, Khair A . Moderately nonlinear diffuse-charge dynamics under an ac voltage. Phys Rev E Stat Nonlin Soft Matter Phys. 2015; 92(3):032305. DOI: 10.1103/PhysRevE.92.032305. View

Davidson S, Andersen M, Mani A . Chaotic induced-charge electro-osmosis. Phys Rev Lett. 2014; 112(12):128302. DOI: 10.1103/PhysRevLett.112.128302. View

Vaidyanathan R, Shiddiky M, Rauf S, Dray E, Tay Z, Trau M . Tunable "nano-shearing": a physical mechanism to displace nonspecific cell adhesion during rare cell detection. Anal Chem. 2014; 86(4):2042-9. DOI: 10.1021/ac4032516. View

Shiomi M, Choi E, Huh J . Prewavy instability-originated dielectric chevrons of electroconvection in nematic liquid crystals. Phys Rev E. 2020; 102(4-1):042704. DOI: 10.1103/PhysRevE.102.042704. View

Hojgaard Olesen L, Bazant M, Bruus H . Strongly nonlinear dynamics of electrolytes in large ac voltages. Phys Rev E Stat Nonlin Soft Matter Phys. 2010; 82(1 Pt 1):011501. DOI: 10.1103/PhysRevE.82.011501. View

Luo K, Wu J, Yi H, Tan H . Lattice Boltzmann model for Coulomb-driven flows in dielectric liquids. Phys Rev E. 2016; 93(2):023309. DOI: 10.1103/PhysRevE.93.023309. View

10.

Han C, Jang J . Integrated microfluidic platform with electrohydrodynamic focusing and a carbon-nanotube-based field-effect transistor immunosensor for continuous, selective, and label-free quantification of bacteria. Lab Chip. 2020; 21(1):184-195. DOI: 10.1039/d0lc00783h. View

11.

Vaidyanathan R, Dey S, Carrascosa L, Shiddiky M, Trau M . Alternating current electrohydrodynamics in microsystems: Pushing biomolecules and cells around on surfaces. Biomicrofluidics. 2015; 9(6):061501. PMC: 4676781. DOI: 10.1063/1.4936300. View

12.

Krekhov A, Decker W, Pesch W, Eber N, Salamon P, Fekete B . Patterns driven by combined ac and dc electric fields in nematic liquid crystals. Phys Rev E Stat Nonlin Soft Matter Phys. 2014; 89(5):052507. DOI: 10.1103/PhysRevE.89.052507. View

13.

Kim J, Davidson S, Mani A . Characterization of Chaotic Electroconvection near Flat Inert Electrodes under Oscillatory Voltages. Micromachines (Basel). 2019; 10(3). PMC: 6470596. DOI: 10.3390/mi10030161. View