Two-fluid mixing in a microchannel

Liu, Ying Zheng; Kim, Byoung Jae; Sung, Hyung Jin

doi:10.1016/j.ijheatfluidflow.2004.03.006

Cited by 128 publications

(79 citation statements)

References 12 publications

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“…To characterize the mixing performance of the micromixers in order to better understand and design more efficient micromixers for different applications, a number of techniques, both experimentally [14][15][16][17][18] and theoretically [12,[19][20][21][22][23][24][25][26][27][28], have been employed. Particularly, CFD has been widely used to study the mixing behavior of micromixers in details.…”

Section: Open Accessmentioning

confidence: 99%

Evaluation of Floor-grooved Micromixers using Concentration-channel Length Profiles

Zhang

Yim

et al. 2010

Micromachines

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Abstract:We evaluated the dynamic micromixing performances in slanted groove micromixers (SGM) and staggered herringbone micromixers (SHM) and quantitatively compared their differences using concentration vs. channel length profiles obtained from numerical stimulations. It is found that faster and finer mixing took place in the SHM and the chaotic mixing was more effective at locations closer to the grooves; in comparison, slower and coarser mixing occurred throughout the whole channel of the SGM. Subsequently, the concentration profile-based characterization method was demonstrated in hybrid floor-grooved micromixers to study the interaction of SGM and SHM.

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Section: Open Accessmentioning

confidence: 99%

Evaluation of Floor-grooved Micromixers using Concentration-channel Length Profiles

Zhang

Yim

et al. 2010

Micromachines

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“…Several CFD studies on the SHM report consistent mixing profiles between computational and experimental methods via the solution of the convection-diffusion equation for the concentration field. 25,26 Although these methods are particularly useful for visualization of the flow field, numerical diffusion errors are typically high and quantification of the mixing efficiency is difficult. To avoid these numerical errors, several studies have utilized particle tracking methods to characterize the mixing properties of the SHM and SGM in more detail.…”

Section: Introductionmentioning

confidence: 99%

Geometrical optimization of helical flow in grooved micromixers

Lynn

Dandy

2007

Lab Chip

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Owing to the enhancement of surface effects at the micro-scale, patterned grooves on a micro-channel floor remain a powerful method to induce helical flows within a pressure driven system. Although there have been a number of numerical studies on geometrical effects concerning fluid mixing within the staggered herringbone mixer, all have focused mainly on the groove angle and depth, two factors that contribute greatly to the magnitude of helical flow. Here we present a new geometrical factor that significantly affects the generation of helical flow over patterned grooves. By varying the ratio of the length of the grooves to the neighboring ridges, helical flow can be optimized for a given groove depth and channel aspect ratio, with up to 50% increases in transverse flow possible. A thorough numerical study of over 700 cases details the magnitude of helical flow over unsymmetrical patterned grooves in a slanted groove micro-mixer, where the optimized parameters for the slanted groove mixer can be translated to the staggered herringbone mixer. The optimized groove geometries are shown to have a large dependence on the channel aspect ratio, the groove depth ratio, and the ridge length.

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“…They are still included here for an indication of the mixing efficiency. To quantitatively evaluate the mixing efficiency, we define the index of mixing as in (Liu et al 2004) as …”

Section: Figmentioning

confidence: 99%

A novel passive micromixer: lamination in a planar channel system

Tofteberg

Skolimowski

Andreassen

et al. 2009

Microfluid Nanofluid

118

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A novel passive micromixer concept is presented. The working principle is to make a controlled 90 degree rotation of a flow cross section followed by a split into several channels; the flow in each of these channels is rotated a further 90 degrees before a recombination doubles the interfacial area between the two fluids. This process is repeated until achieving the desired degree of mixing. The rotation of the flow field is obtained by patterning the channel bed with grooves. The effect of the mixers has been studied using computational fluid mechanics and prototypes have been micromilled in poly(methyl methacrylate). Confocal microscopy has been used to study the mixing. Several micromixers working by the principle of lamination have been reported in recent years. However, they require three dimensional channel designs which can be complicated to manufacture. The main advantage with the present design is that it is relatively easy to produce using standard microfabrication techniques while at the same time obtaining good lamination between two fluids.

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Two-fluid mixing in a microchannel

Cited by 128 publications

References 12 publications

Evaluation of Floor-grooved Micromixers using Concentration-channel Length Profiles

Evaluation of Floor-grooved Micromixers using Concentration-channel Length Profiles

Geometrical optimization of helical flow in grooved micromixers

A novel passive micromixer: lamination in a planar channel system

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