Numerical simulation of a three dimensional electroosmotic micromixer with a flexible and controllable Rubik's cube module

Feng, Qiaoyu; Chen, Xueye; Wang, Xiangyang; Yu, Xingxing; Zeng, Xin; Ma, Yongbiao

doi:10.1016/j.icheatmasstransfer.2021.105482

Cited by 13 publications

(3 citation statements)

References 20 publications

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“…The adding of electrical potential onto fluid will make vortices emerge in various sizes, numbers, and positions in the microchannel. 45 The performance of active-mode cylindrical MHD micromixer shows that electrical potential delivers a dominant effect on mixing performance compared to Reynolds number. Xu et al 46 designed and studied a T-micromixer with an embedded copper cylinder as a heater element (Figure 9), and recorded a comparably high mixing efficiency for a micromixer with a very low flow rate.…”

Section: Resultsmentioning

confidence: 99%

Enhanced mixing in dual-mode cylindrical magneto-hydrodynamic (MHD) micromixer

Buglie

Tamrin

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The proposed cylindrical magneto-hydrodynamic (MHD) micromixer developed in this study was a geometrically modified conventional T-micromixer combining the characteristics of passive and active micromixers. Characterization was achieved by observing the mixing efficiencies of NaCl solution (1% concentration) based on supplied electrical potential and inlet flow rates. The design mainly aimed to utilize the pumping capability of the magneto-hydrodynamic principle as a secondary element to give counter pumping energy towards inlet flows, such that perturbation of fluid increased mixing performance. NaCl solution was mixed by advection through the stretching and folding by micro-vortices generated in the mixing reservoir. The cylindrical MHD micromixer achieved its highest mixing index of 99.42% at Re = 40 with 3 V of direct-current potential (VDC) supplied to the electrodes. Mixing efficiency increased in a considerably similar and linear pattern for Re = 5, 10, 20, and 40 within the electrical potential range of 0.5 ≤ V ≤ 3.0. Control was gained by manipulating the external electrical potential source which only required a smaller capacity of direct-current voltage sources. Overall, the proposed cylindrical MHD micromixer, which emphasizes the use of inexpensive material and simple design, has been experimentally proven to be practical as compared to the passive and active micromixers found in the literature.

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Section: Resultsmentioning

confidence: 99%

Enhanced mixing in dual-mode cylindrical magneto-hydrodynamic (MHD) micromixer

Buglie

Tamrin

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Different EOF patterns were observed at lower flow rates, contributing to enhanced mixing compared to higher flow rates. Feng et al designed a 3D electro-osmotic micromixer with a rectangular conductor resembling a Rubik's cube in the middle of the channel [75]. Each surface of the cube was divided into 9 cubes that could rotate freely, similar to a physical Rubik's cube.…”

Section: Electrokineticsmentioning

confidence: 99%

Microfluidic Mixing: A Physics-Oriented Review

Saravanakumar,

Cicek

2023

Micromachines

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This comprehensive review paper focuses on the intricate physics of microfluidics and their application in micromixing techniques. Various methods for enhancing mixing in microchannels are explored, with a keen emphasis on the underlying fluid dynamics principles. Geometrical micromixers employ complex channel designs to induce fluid–fluid interface distortions, yielding efficient mixing while retaining manufacturing simplicity. These methods synergize effectively with external techniques, showcasing promising potential. Electrohydrodynamics harnesses electrokinetic phenomena like electroosmosis, electrophoresis, and electrothermal effects. These methods offer dynamic control over mixing parameters via applied voltage, frequency, and electrode positioning, although power consumption and heating can be drawbacks. Acoustofluidics leverages acoustic waves to drive microstreaming, offering localized yet far-reaching effects. Magnetohydrodynamics, though limited in applicability to certain fluids, showcases potential by utilizing magnetic fields to propel mixing. Selecting an approach hinges on trade-offs among complexity, efficiency, and compatibility with fluid properties. Understanding the physics of fluid behavior and rationalizing these techniques aids in tailoring the most suitable micromixing solution. In a rapidly advancing field, this paper provides a consolidated understanding of these techniques, facilitating the informed choice of approach for specific microfluidic mixing needs.

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“…The EOF can not only eliminate the need for mechanical micropumps but is also easy to control and operate, which has been widely used in fields such as lubrication [22], micromixers [23], and micropumps [24]. The transportation efficiencies of EOF alone and when combined with pressure-driven flow (PDF) within microchannels have been extensively researched [25][26][27][28][29][30][31][32][33]. For example, Dutta et al [25] established a mathematical model to address the temperature, Nusselt number, and convective heat transfer coefficient of the steady EOF with a random pressure gradient in a two-dimensional parallel microchannel.…”

Section: Introductionmentioning

confidence: 99%

The Optimal Branch Width Convergence Ratio to Maximize the Transport Efficiency of the Combined Electroosmotic and Pressure-Driven Flow within a Fractal Tree-like Convergent Microchannel

Jing,

2024

Fractal Fract

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Building upon the efficient transport capabilities observed in the fractal tree-like convergent structures found in nature, this paper numerically studies the transport process of the combined electroosmotic and pressure-driven flow within a fractal tree-like convergent microchannel (FTCMC) with uniform channel height. The present work finds that the flow rate of the combined flow first increases and then decreases with the increasing branch width convergence ratio under the fixed voltage difference and pressure gradient along the FTCMC, which means that there is an optimal branch width convergence ratio to maximize the transport efficiency of the combined flow within the FTCMC. The value of the optimal branch convergence ratio is highly dependent on the ratio of the voltage difference and pressure gradient to drive the combined flow. By adjusting the structural and dimensional parameters of the FTCMC, the dependencies of the optimal branch convergence ratio of the FTCMC on the branching level convergence ratio, the length ratio, the branching number, and the branching level are also investigated. The findings in the present work can be used for the optimization of FTCMC with high transport efficiency for combined electroosmotic and pressure-driven flow.

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Numerical simulation of a three dimensional electroosmotic micromixer with a flexible and controllable Rubik's cube module

Cited by 13 publications

References 20 publications

Enhanced mixing in dual-mode cylindrical magneto-hydrodynamic (MHD) micromixer

Enhanced mixing in dual-mode cylindrical magneto-hydrodynamic (MHD) micromixer

Microfluidic Mixing: A Physics-Oriented Review

The Optimal Branch Width Convergence Ratio to Maximize the Transport Efficiency of the Combined Electroosmotic and Pressure-Driven Flow within a Fractal Tree-like Convergent Microchannel

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