Mixing characteristics of T-type microfluidic mixers

Gobby, Darren; Angeli, Panagiota; Gavriilidis, Asterios

doi:10.1088/0960-1317/11/2/307

Cited by 304 publications

(170 citation statements)

References 8 publications

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“…In lamination mixers, the fluid streams are separated into several small streams that are later connected in a mixing channel [12]. On the other hand, an injection mixer splits only one stream into many sub-streams, which increases the contact surface and reduces the mixing path [7].…”

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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“…Commonly used procedures include Pt 4? or Pt 2? salts reduction by borohydride [12][13][14][15][16], hydrogen [17,18], alcohol [19][20][21][22][23][24], glycol [25,26], or ethylene glycol [27,28] in the presence of a stabilizer or on a solid support. Despite a large choice of synthetic protocols, an accurate control of the particle size, simple and reproducible synthetic strategies are important to investigate their physical and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

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“…These result in an interfacial area that increases with the number of lamellae rendering the diffusion process more effective and hence allowing fast mixing (Bessoth et al 1999). There are many examples of bi-lamellation (Gobby et al 2001;Mingquiang 2000) and multi-lamellation (Hessel et al 2005) in the literature on micromixers. However, the drawback of such devices is that the number of lamellae is generally limited due to the negative impact on the applied pressure drop caused by the required microstructures inside the channel.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the performance of chaotic micromixers on the basis of finite time Lyapunov exponents

Sarkar

Narváez

Harting

2012

Microfluid Nanofluid

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Chaotic micromixers such as the staggered herringbone mixer developed by Stroock et al. allow efficient mixing of fluids even at low Reynolds number by repeated stretching and folding of the fluid interfaces. The ability of the fluid to mix well depends on the rate at which ''chaotic advection'' occurs in the mixer. An optimization of mixer geometries is a non-trivial task which is often performed by time consuming and expensive trial and error experiments. In this paper an algorithm is presented that applies the concept of finite-time Lyapunov exponents to obtain a quantitative measure of the chaotic advection of the flow and hence the performance of micromixers. By performing lattice Boltzmann simulations of the flow inside a mixer geometry, introducing massless and noninteracting tracer particles and following their trajectories the finite time Lyapunov exponents can be calculated. The applicability of the method is demonstrated by a comparison of the improved geometrical structure of the staggered herringbone mixer with available literature data.

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Mixing characteristics of T-type microfluidic mixers

Cited by 304 publications

References 8 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

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Quantification of the performance of chaotic micromixers on the basis of finite time Lyapunov exponents

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