Traveling wave electroosmosis: The influence of electrode array geometry

Hrdlička, J.; Patel, Niketan S.; Šnita, Dalimil

doi:10.1002/elps.201300614

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…In this investigation, we focused on the EOF of insulated wall forced by AC electric field, that is, AC‐electric‐field forced EOF (ACFEOF), which is a major branch of transient EOF. Recently, ACFEOF and many relevant EOFs, like pulsatile EOF and oscillating EOF, and so forth, have been used in the enhancement of scalar and momentum transport, enhancing mixing, and separation of biological targets 2‐24 …”

Section: Introductionmentioning

confidence: 99%

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Transition from periodic to chaotic AC electroosmotic flows near electric double layer

Zhao

et al. 2021

AIChE Journal

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Electroosmotic flows (EOFs) on insulated interfacial surface commonly exists as interfacial flows. Previously theoretical studies indicate that EOFs of Newtonian fluids on the insulated interfacial surface are steady in microchannels with symmetric zeta potentials (Suresh and Homsy, Physics of Fluids, 2004, 16, 2,349). Restricted by flow diagnostic methods in microfluidics, few velocity measurements of instantaneous EOFs have been reported, and the existence of unsteady EOFs on the insulated surface remains unclear. In this investigation, the velocity fluctuations of EOFs generated under AC electric field (named as ACFEOF) overlapped on a steady pressuredriven flow are measured by laser induced fluorescence photobleaching anemometer, at the diffuse electric double layer (EDL) on the bottom wall far from electrodes. Chaotic velocity fluctuations according to unsteady ACFEOF has been, for the first time, observed. Stokes number (St) and electrical Reynolds number (Re E) related to oscillation and electro-inertial effect are suggested to control chaotic ACFEOF.

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Section: Introductionmentioning

confidence: 99%

“…Beside E A , f f is also a control parameter of flow state. Their influences can be described by St, Re E (and Pe e,i ) in Equations (10) and(12). Here, we let l s = h/2.…”

mentioning

confidence: 99%

Transition from periodic to chaotic AC electroosmotic flows near electric double layer

Zhao

et al. 2021

AIChE Journal

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“…Due to low excitation voltage, easy control and high integrity, the use of AC electro-kinetic (ACEK) has attracted considerable attentions for manipulation of fluids [4]. ACEK applications include fluid pumping [5,6], mixing [7,8], particle/cell transportation, trapping, purification and sorting [9][10][11]. General ACEK can be categorized in di- temperature gradient field T is induced inside the bulk solution.…”

Section: Introductionmentioning

confidence: 99%

Bi‐directional ACET micropump for on‐chip biological applications

et al. 2016

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The ability to control and pump high ionic strength fluids inside microchannels forms a major advantage for clinical diagnostics and drug screening processes, where high conductive biological and physiological buffers are used. Despite the known potential of AC electro-thermal (ACET) effect in different biomedical applications, comparatively little is known about controlling the velocity and direction of fluid inside the chip. Here, we proposed to discretize the conventional electrodes to form various asymmetric electrode structures in order to control the fluid direction by simple switching the appropriate electric potential applied to the discretized electrodes. The ACET pumping effect was numerically studied by solving electrical, thermal and hydrodynamic multi-physic coupled equations to optimize the geometrical dimensions of the discretized system. PBS solutions with different ionic strength were seeded with 1 μm sized fluorescent particles and electrothermally driven fluid motion was observed inside the channel for different electrode structures. Experimental analyses confirm that the proposed micropump is efficient for a conductivity range between 0.1 and 1 S/m and the efficiency improves by increasing the voltage amplitude. Behavior of the proposed electrode-electrolyte system is discussed by lumped circuit model. Frequency response of system illustrated that the optimal frequency range increases by increasing the conductivity of medium. For 0.18 S/m PBS solution, the constant pumping effect was observed at frequency range between 100 kHz and 1 MHz, while frequency range of 100 kHz to 5 MHZ was observed for 0.42 S/m. The characteristics of experimental results were in good agreement with the theoretical model.

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“…For example, Lin and Chen utilized Lattice Poisson–Boltzmann method to investigate the OEOF in a parallel plate microchannel with the presence of pressure-driven flow. Besides the aforementioned works, there are still many other theoretical and numerical studies related to OEOF in micro- and nanofluidics applications. ,,− …”

mentioning

confidence: 99%

Study of Oscillating Electroosmotic Flows with High Temporal and Spatial Resolution

et al. 2018

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Near-wall velocity of oscillating electroosmotic flow (OEOF) driven by an AC electric field has been investigated using a laser-induced fluorescence photobleaching anemometer (LIFPA). For the first time, an up to 3 kHz velocity response of OEOF has been successfully measured experimentally, even though the oscillating velocity is as low as 600 nm/s. It is found that the oscillating velocity decays with the forcing frequency f as f. In the investigated range of electric field intensity (E), below 1 kHz, the linear relation between oscillating velocity and E is also observed. Because the oscillating velocity at high frequency is very small, the contribution of noise to velocity measurement is significant, and it is discussed in this manuscript. The investigation reveals the instantaneous response of OEOF to the temporal change of electric fields, which exists in almost all AC electrokinetic flows. Furthermore, the experimental observations are important for designing OEOF-based micro/nanofluidics systems.

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Traveling wave electroosmosis: The influence of electrode array geometry

Cited by 8 publications

References 20 publications

Transition from periodic to chaotic AC electroosmotic flows near electric double layer

Transition from periodic to chaotic AC electroosmotic flows near electric double layer

Bi‐directional ACET micropump for on‐chip biological applications

Study of Oscillating Electroosmotic Flows with High Temporal and Spatial Resolution

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