Numerical Evaluation of Two-Fluid Mixing in a Swirl Micro-Mixer

Jin, Siyu; Liu, Yingzheng; Wang, Weizhe; Cao, Zhaomin; Koyama, Hide S.

doi:10.1016/s1001-6058(06)60132-7

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…This study analyzes three different configurations of a microfluidic system via numerical simulations. The results are compared with the previous works [23,24]: lamination micromixers with a cylinder, plus one or four pairs of inlets and one outlet. Results of various total inlet flow rates on the mixing performance are presented in Figure 10(d).…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Swirling Flows in Mixing Chambers

Chen

2011

Modelling and Simulation in Engineering

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This investigation analyzed the three-dimensional momentum and mass transfer characteristics arising from multiple inlets and a single outlet in micromixing chamber. The chamber consists of a right square prism, an octagonal prism, or a cylinder. Numerical results which were presented in terms of velocity vector plots and concentration distributions indicated that the swirling flows inside the chamber dominate the mixing index. Particle trajectories were utilized to demonstrate the rotational and extensional local flows which produce steady stirring, and the configuration of colored particles at the outlet section expressed at different Re represented the mixing performance qualitatively. The combination of the Taylor dispersion and the vorticity was first introduced and made the mixing successful. The effects of various geometric parameters and Reynolds numbers on the mixing characteristics were investigated. An optimal design of the cylindrical chamber with 4 inlets can be found. At larger Reynolds number,Re>15,more inertia caused the powerful swirling flows in the chamber, and more damping effect on diffusion was diminished, which then increased the mixing performance.

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Section: Resultsmentioning

confidence: 99%

“…The Re is higher than a value of 2.32, and a self-rotation effect is induced in the chamber. A swirl micromixer with two branch channels, a central chamber, and an exit tube was carried out by Jin et al [24]. The dependence of the mixture viscosity and density on the mass fraction of solution was taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Swirling Flows in Mixing Chambers

Chen

2011

Modelling and Simulation in Engineering

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“…Micro-mixers (channels $ <500 lm) are mostly used in ''lab-ona-chip'' devices for analytical purposes [22][23][24]. The use of microfabricated structures and microfluidics offers many advantages, including new functionalities, higher throughput, reduced sample consumption, shorter analysis time, and reduced operating and manufacturing costs [23,25,26].…”

Section: Introductionmentioning

confidence: 99%

Design of turbulent tangential micro-mixers that mix liquids on the nanosecond time scale

Mitić

Nieuwkasteele

Berg

et al. 2015

Analytical Biochemistry

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“…Vortex breakdown is an intriguing and important phenomenon that occurs in a variety of natural and technological swirling flows, for example, swirling combustor, cyclone, bathtub vortex, hurricanes and tornadoes, and spiral galaxies. In general, the appearance of swirl is caused by the impartment of rotating motion upon the jet which makes the flow more complicated and has been widely studied in the literature [1][2][3][4][5][6][7][8][9][10]. The scope of this study does not include summarizing existing vast literature of swirling flow investigation; thus, only a few investigations on this topic were covered.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Characteristics of Turbulence Dissipation in Swirling Flow: A Direct Numerical Simulation Study

Yang

Gui

Xie

et al. 2015

Advances in Mathematical Physics

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This study investigates the anisotropic characteristics of turbulent energy dissipation rate in a rotating jet flow via direct numerical simulation. The turbulent energy dissipation tensor, including its eigenvalues in the swirling flows with different rotating velocities, is analyzed to investigate the anisotropic characteristics of turbulence and dissipation. In addition, the probability density function of the eigenvalues of turbulence dissipation tensor is presented. The isotropic subrange of PDF always exists in swirling flows relevant to small-scale vortex structure. Thus, with remarkable large-scale vortex breakdown, the isotropic subrange of PDF is reduced in strongly swirling flows, and anisotropic energy dissipation is proven to exist in the core region of the vortex breakdown. More specifically, strong anisotropic turbulence dissipation occurs concentratively in the vortex breakdown region, whereas nearly isotropic turbulence dissipation occurs dispersively in the peripheral region of the strong swirling flows.

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Numerical Evaluation of Two-Fluid Mixing in a Swirl Micro-Mixer

Cited by 14 publications

References 7 publications

Investigation of Swirling Flows in Mixing Chambers

Investigation of Swirling Flows in Mixing Chambers

Design of turbulent tangential micro-mixers that mix liquids on the nanosecond time scale

Anisotropic Characteristics of Turbulence Dissipation in Swirling Flow: A Direct Numerical Simulation Study

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