Mixing Analysis of Passive Micromixer with Unbalanced  Three-Split Rhombic Sub-Channels

Hossain, Shakhawat; Kim, Kwang‐Yong

doi:10.3390/mi5040913

Cited by 59 publications

(40 citation statements)

References 33 publications

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“…3. It can be seen from our results that efficient mixing usually occurs when a strong as highlighted in the review of Hessel et al [12] or in the particular cases of Bhagat et al [3], Wang et al [40] and Hossain and Kim [14]. In the aforementioned studies (and numerous others), the devices considered reach mixing indexes of up to 0.5 − 0.6 (using similar performance measurement methods).…”

Section: Resultssupporting

confidence: 73%

Electrostatically induced mixing in confined stratified multi-fluid systems

Cimpeanu

Papageorgiou

2015

International Journal of Multiphase Flow

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Electrostatic control mechanisms underpin a wide range of modern industrial processes, from lab-ona-chip devices to microfluidic sensors for security applications. During the last decades, the striking impact of fluid interface manipulation in contexts such as polymer self-assembly, micromanufacturing and mixing in viscous media has established the field of electrically driven interfacial flows as invaluable.This work investigates electrostatically induced interfacial instabilities and subsequent generation of nonlinear coherent structures in immiscible, viscous, dielectric multi-layer stratified flows confined in channels with plane walls. The present study demonstrates theoretically that interfacial instabilities can be utilized to achieve efficient mixing in different immiscible fluid regions. This is accomplished by electrostatically driving stable flows far from their equilibrium states to attain time-oscillatory and highly nonlinear flows producing mixing. The nonlinear electrohydrodynamic instabilities play the role of imposed background velocity fields or moving device parts in more traditional mixing protocols.Initially, simple yet efficient on-off voltage protocols are investigated and subsequently symmetrybreaking voltage distributions are considered and shown to considerably enhance the achieved level of mixing. Both two and three-dimensional flows, containing realistic fluid configurations (water and oils), are computed using direct numerical simulations based on the Navier-Stokes equations. Such numerical investigations facilitate the quantitative study of the flow into the fully nonlinear regime and constitute the basis of optimization methods in the context of microfluidic mixing applications in two-and three-dimensional geometries.

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Section: Resultssupporting

confidence: 73%

Electrostatically induced mixing in confined stratified multi-fluid systems

Cimpeanu

Papageorgiou

2015

International Journal of Multiphase Flow

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“…Recently, computational fluid dynamics (CFD) has become very popular technique to analyze the mixing and fluid flow in micromixers. In recent years, many investigations have been performed to improve the mixing in a variety of passive micromixers; T-type micromixer (Gobby et al 2001 ) and Y-type micromixer (Sahu et al 2012 ), serpentine micromixers (Beebe et al 2001 ; Hossain et al 2009 ; Ansari and Kim 2009 ; Sahu et al 2013 ), split-and-recombinination (SAR) micromixers (Lee and Lee 2008 ; Viktorov and Nimafar 2013 ; Nimafar et al 2012a , b ; Hossain and Kim 2014 ), patterned grooves micromixers (Ansari and Kim 2007 ; Hossain et al 2010a , b ), etc. It was exposed that shifting the inlet direction in a T-type micromixer did not appreciably improve the mixing performance (Gobby et al 2001 ).…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation on mixing in a micromixer with two-layer crossing channels

Hossain

Kim

2016

SpringerPlus

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This work presents a parametric investigation on flow and mixing in a chaotic micromixer consisting of two-layer crossing channels proposed by Xia et al. (Lab Chip 5: 748–755, 2005). The flow and mixing performance were numerically analyzed using commercially available software ANSYS CFX-15.0, which solves the Navier–Stokes and mass conservation equations with a diffusion–convection model in a Reynolds number range from 0.2 to 40. A mixing index based on the variance of the mass fraction of the mixture was employed to evaluate the mixing performance of the micromixer. The flow structure in the channel was also investigated to identify the relationship with mixing performance. The mixing performance and pressure-drop were evaluated with two dimensionless geometric parameters, i.e., ratios of the sub-channel width to the main channel width and the channels depth to the main channel width. The results revealed that the mixing index at the exit of the micromixer increases with increase in the channel depth-to-width ratio, but decreases with increase in the sub-channel width to main channel width ratio. And, it was found that the mixing index could be increased up to 0.90 with variations of the geometric parameters at Re = 0.2, and the pressure drop was very sensitive to the geometric parameters.

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“…A grid sensitivity test was performed for the mixing efficiency to determine the optimum number of grid points for each micromixer. Grid systems with 2.5ˆ10 5 , 3ˆ10 5 , and 5ˆ10 5 nodes were found to be optimal for the Tear-drop, the Y-Y, and the H-C mixers, respectively.…”

Section: Numerical Investigationmentioning

confidence: 99%

“…Mixing within microfluidic devices, typically operating at Reynolds numbers smaller than 100, is heavily dependent on molecular diffusion [4], which is a very slow process [5]. Accordingly, in absence of any transverse convection, complete mixing of two fluids conveyed in a simple channel, as in a T-mixer, normally needs a long time and long channel length [6].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Passive Micromixers at a Wide Range of Reynolds Numbers

2015

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Two novel passive micromixers, denoted as the Y-Y mixer and the H-C mixer, based on split-and-recombine (SAR) principle are studied both experimentally and numerically over Reynolds numbers ranging from 1 to 100. An image analysis technique was used to evaluate mixture homogeneity at four target areas. Numerical simulations were found to be a useful support for the design phase, since a general idea of mixing of fluids can be inferred from the segregation or the distribution of path lines. Comparison with a well-known mixer, the Tear-drop one, was also performed. Over the examined range of Reynolds numbers 1 ď Re ď 100, the Y-Y and H-C mixers showed at their exit an almost flat mixing index characteristic, with a mixing efficiency higher than 90%; conversely the Tear-drop mixer showed a relevant decrease of efficiency at mid-range. Furthermore, the Y-Y and the H-C showed significantly less pressure drop than the Tear-drop mixer.

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Mixing Analysis of Passive Micromixer with Unbalanced Three-Split Rhombic Sub-Channels

Cited by 59 publications

References 33 publications

Electrostatically induced mixing in confined stratified multi-fluid systems

Electrostatically induced mixing in confined stratified multi-fluid systems

Parametric investigation on mixing in a micromixer with two-layer crossing channels

Comparative Analysis of Passive Micromixers at a Wide Range of Reynolds Numbers

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