Strong rotating flow in stationary droplets in low power budget using wire electrode configuration

Kunti, Golak; Bhattacharya, Anandaroop; Chakraborty, Suman

doi:10.1002/elps.201900272

Cited by 4 publications

(1 citation statement)

References 58 publications

(94 reference statements)

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“…The fluid flow in the microchannel is assumed to be steady and incompressible. Hence, the ACET-induced convection is governed by the momentum and continuity equations , where ρ f , u , η, and p are the fluid density, flow velocity, dynamic viscosity, and pressure, respectively.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Three-Fluid Sequential Micromixing-Assisted Nanoparticle Synthesis Utilizing Alternating Current Electrothermal Flow

Sun

Ren

Tao

et al. 2020

Ind. Eng. Chem. Res.

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Multiple micromixing in a controlled sequence is an essential process for complex chemical synthesis of functional nanoparticles with desired physicochemical properties. Herein, we developed a unique sequential micromixing-assisted nanoparticle synthesis platform utilizing alternating current electrothermal flow (ACET). A two-fluid micromixer comprised with pairs of staggered asymmetric electrodes was first designed and characterized by joint numerical simulations and experiments to obtain the optimized electrode configuration within a straight channel. On this basis, an extra pair of symmetric electrodes was added at the main channel entrance to form a three-fluid sequential micromixer. The middle fluid would first mix with the side fluids through the symmetric ACET microvortex pair in the upstream region and then realize the side fluid mixing by the asymmetric ACET microvortex in the downstream region. Rapid and complete mixing in a short channel was observed for a relatively high flow velocity up to 7 mm/s at an AC signal of 27.5 V and 1 MHz. Sequential micromixing was achieved by flexibly adjusting the volume of each fluid and the AC voltage within the three-fluid mixer. Both the two-fluid mixing process and the three-fluid mixing process were applied to synthesize the Co−Fe Prussian blue analogue nanoparticles. In comparison with two-fluid mixing, three-fluid sequential mixing offers nanoparticles with higher dispersion, controlled particle morphology, and more regular shapes. Therefore, the ACET flow-based sequential micromixing strategy can be an alternative for complex chemical and biochemical reactions.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Three-Fluid Sequential Micromixing-Assisted Nanoparticle Synthesis Utilizing Alternating Current Electrothermal Flow

Sun

Ren

Tao

et al. 2020

Ind. Eng. Chem. Res.

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Numerical simulation of a tuneable reversible flow design for practical ACET devices

2020

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Alternating Current Electrothermal (ACET) micropumps are a well-documented flow induction and mixing method. This phenomenon has significant promise as a reliable microfluidic pumping method for high conductivity biofluids, such as cerebrospinal fluid, urine, or blood. Practical implementations so far have been limited by complex designs focused on maximized flow rates, typically in only one direction at a time. This paper describes a device geometry demonstrating, and quantifying for the first time, fully reversible flow, that is, going from 100% flow in one direction to fully symmetrical 100% flow in the opposite direction. This design incorporates multiple features targeted at practical fabrication and applications. The design enables fine-tuning of flow speeds via adjustable signal strengths in a unique manner compared to traditional ACET devices. A full numerical simulation of this device has been performed within this work. Additionally, this paper reports several methods for increasing usability of ACET devices, including proposing coatings to prevent electrolysis and increase flow rates without the risk of fluid reactions, manufacturing methods for ease of handling, and specific device parameters for implementation in microdevices. The development of an ACET device that can precisely and efficiently pump and extract fluids allows for new applications in integrated biological systems and monitoring devices.

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Numerical investigation of micro-droplets mixing in electrowetting-on-dielectric digital microfluidics: The merging process and frequency response

et al. 2022

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In this study, we numerically investigate the mixing of two sessile micro-droplets in open electrowetting-on-dielectric (EWOD) digital microfluidics. The mixing process is composed of the merging and the subsequent oscillation process achieved by applying alternating voltage (AC voltage) to the droplet with desired frequency and amplitude. The numerical results show excellent agreement with previous numerical and experimental studies. The focus of this study is probing into the effects of the merging process on the subsequent AC voltage-actuated oscillation of the droplet. It is observed that the merging process breaks the azimuthal symmetry of the droplet and, hence, introduces the sectoral mode to the subsequent AC voltage-actuated oscillation. The frequency dependence of the enhancement and dissipation of the sectoral oscillation is quantitatively investigated. Furthermore, the sectoral oscillation inherited from the merging process is confirmed to have little impact on the zonal oscillation of the droplet. The oscillation-based mixing enhancement of the droplet is numerically verified.

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Strong rotating flow in stationary droplets in low power budget using wire electrode configuration

Cited by 4 publications

References 58 publications

Three-Fluid Sequential Micromixing-Assisted Nanoparticle Synthesis Utilizing Alternating Current Electrothermal Flow

Three-Fluid Sequential Micromixing-Assisted Nanoparticle Synthesis Utilizing Alternating Current Electrothermal Flow

Numerical simulation of a tuneable reversible flow design for practical ACET devices

Numerical investigation of micro-droplets mixing in electrowetting-on-dielectric digital microfluidics: The merging process and frequency response

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