Evaluation of the mixing performance of three passive micromixers

Hossain, Shakhawat; Ansari, Mubashshir Ahmad; Kim, Kwang‐Yong

doi:10.1016/j.cej.2009.02.033

Cited by 196 publications

(96 citation statements)

References 18 publications

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“…Various investigations have been performed to characterize the mixing of fluids based on the analysis of laminar flow and mixing in passive micromixers such as T mixers, Y mixers, different types of serpentine micromixers [13,14], micromixers with patterned grooves [15][16][17], and split and recombine (SAR) micromixers [18][19][20][21]. Numerical and experimental studies were performed by Fang and Yang [22] on a three-dimensional (3-D) rotating microfluidic device with a range of Reynolds numbers from 0.01-100.…”

Section: Open Accessmentioning

confidence: 99%

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

Hossain

Kim

2014

Micromachines

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Abstract:A micromixer with unbalanced three-split rhombic sub-channels was proposed, and analyses of the mixing and flow characteristics of this micromixer were performed in this work. Three-dimensional Navier-Stokes equations in combination with an advection-diffusion model with two working fluids (water and ethanol) were solved for the analysis. The mixing index and pressure drop were evaluated and compared to those of a two-split micromixer for a range of Reynolds numbers from 0.1-120. The results indicate that the proposed three-split micromixer is efficient in mixing for a range of Reynolds numbers from 30-80. A parametric study was performed to determine the effects of the rhombic angle and sub-channel width ratio on mixing and pressure drop. Except at the lowest Reynolds number, a rhombic angle of 90° gave the best mixing performance. The three-split micromixer with minimum minor sub-channel widths provided the best mixing performance.

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Section: Open Accessmentioning

confidence: 99%

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

Hossain

Kim

2014

Micromachines

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“…The inlet integrated with T or Y joint is generally used for most micromixers and microfluidics systems [6][7][8][9][10][11][12][13]. Three different shapes of two-dimensional serpentine micromixer have been considered to evaluate the mixing index by Hossain et al [14]. Their numerical study revealed that the square wave micromixer showed better mixing than the others.…”

Section: Introductionmentioning

confidence: 99%

Mixing Performance of a Serpentine Micromixer with Non-Aligned Inputs

Hossain

Kim

2015

Micromachines

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Abstract:In this study, a numerical investigation on mixing and flow structure in a serpentine microchannel with non-aligned input channels was performed. The non-aligned input channels generate a vortical flow, which is formed by incoming fluid streams through tangentially aligned channels. Mixing index was evaluated to measure the degree of mixing in the micromixer. Analyses of mixing and flow field were investigated for a Reynolds number range starting from 0.1 to 120. The vortical structure of the flow was analyzed to find its effect on the mixing performance. Mixing of two working fluids in the micromixer was evaluated by using three-dimensional Navier-Stokes equations. In order to compare the mixing performance between the serpentine micromixers with and without non-aligned inputs, the geometric parameters, such as cross-section areas of the input channels and main channel, height of the channel, axial length of the channel, and number of pitches, were kept constant. Pressure drops were also calculated with fixed axial length in both cases.

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“…Foregoing experiments and simulations have suggested that the no slip boundary condition is still valid for microscale fluid flow theory (Kozicki et al 2003;Cross et al 2006;Koumoutsakos et al 2003;Hossain et al 2009). …”

Section: Validationmentioning

confidence: 96%

Microchannel miter bend effects on pressure equalization and vortex formation

2011

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Simulations have been carried out for water flow in a square microchannel with a miter bend. The simulation considered a pressure-driven flow in a channel-hydraulic diameter of 5 lm for series of Reynolds number (Re) range from 0.056 to 560, in order to investigate water flow at bends. The result shows formation of two vortices after the miter bend, which are more discernible above Re 5.6. The critical inlet velocity for the generation of vortex in this particular geometry occurs at 1 m/s. A simple energy mechanism is postulated to explain the vortex formation as well as core skew direction. The high pressure region at the outer wall before and after the bend is a major factor for vortex formation since the liquid needs to reduce the additional energy effected by the high pressure region. Navier-Stokes equation is utilized with a no slip boundary condition for a total microchannel centerline length of 795 lm which is sufficient to produce a laminar flow pattern at the outlet.

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Evaluation of the mixing performance of three passive micromixers

Cited by 196 publications

References 18 publications

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

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

Mixing Performance of a Serpentine Micromixer with Non-Aligned Inputs

Microchannel miter bend effects on pressure equalization and vortex formation

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