Passive mixing of co-flowing slugs in grooved microchannels

2012 ◽  
Vol 19 (1) ◽  
pp. 17-24 ◽  
Author(s):  
S. Hasnain ◽  
A. Kumar ◽  
S. Ganguly
Keyword(s):  
Passive Mixing

scholarly journals Enhanced passive mixing for paper microfluidics

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25677-25685
Author(s):  
Nurul Nadiah Hamidon ◽  
Gert IJ. Salentijn ◽  
Elisabeth Verpoorte
Keyword(s):  
Paper Microfluidics ◽  
Passive Mixing ◽  
Narrow Gaps

Efficient passive mixing can be achieved by contricting the reagent flow using structures having narrow gaps.

Optimized design of obstacle sequences for microfluidic mixing in an inertial regime

Lab on a Chip ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 3910-3923
Author(s):  
Matteo Antognoli ◽  
Daniel Stoecklein ◽  
Chiara Galletti ◽  
Elisabetta Brunazzi ◽  
Dino Di Carlo
Keyword(s):  
Optimized Design ◽  
Fast Method ◽  
Microfluidic Mixing ◽  
Passive Mixing ◽  
Contact Surfaces ◽  
Inertial Regime

A fast method for designing optimal sequences of passive mixing units is provided for inertial flows. Intense mixing is achieved through highly-controlled stretching of the fluid contact surfaces.

A Planar Labyrinth Micromixer

2010 ◽  
Author(s):  
Jeremy T. Cogswell ◽  
Peng Li ◽  
Mohammad Faghri
Keyword(s):  
Soft Lithography ◽  
Lab On A Chip ◽  
Fluorescein Isothiocyanate ◽  
Reynolds Numbers ◽  
Mixing Efficiency ◽  
Mixing Length ◽  
Two Fluids ◽  
Curved Channels ◽  
Passive Mixing ◽  
Important Challenge

Rapid mixing of two fluids in microchannels has posed an important challenge to the development of many integrated lab-on-a-chip systems. In this paper, we present a planar labyrinth micromixer (PLM) to achieve rapid and passive mixing by taking advantage of a synergistic combination of the Dean vortices in curved channels, a series of perturbation to the fluids from the sharp turns, and an expansion and contraction of the flow field via a circular chamber. The PLM is constructed in a single soft lithography step and the labyrinth has a footprint of 7.32 mm × 7.32 mm. Experiments using fluorescein isothiocyanate solutions and deionized water demonstrate that the design achieves fast and uniform mixing within 9.8 s to 32 ms for Reynolds numbers between 2.5 and 30. Compared to the mixing in the prevalent serpentine design, our design results in 38% and 79% improvements on the mixing efficiency at Re = 5 and Re = 30 respectively. An inverse relationship between mixing length and mass transfer Pe´clet number (Pe) is observed, which is superior to the logarithmic dependence of mixing length on Pe in chaotic mixers. Having a simple planar structure, the PLM can be easily integrated into lab-on-a-chip devices where passive mixing is needed.

Passive mixing control for innovative air diffusion terminal devices for buildings

2010 ◽  
Vol 45 (12) ◽  
pp. 2679-2688 ◽  
Author(s):  
Amina Meslem ◽  
Ilinca Nastase ◽  
Francis Allard
Keyword(s):  
Passive Mixing ◽  
Mixing Control ◽  
Air Diffusion

Analysis of Passive Mixing Behavior in a Poly(Dimethylsiloxane) Microfluidic Channel Using Confocal Fluorescence and Raman Microscopy

2004 ◽  
Vol 58 (10) ◽  
pp. 1172-1179 ◽  
Author(s):  
Taehan Park ◽  
Moonkwon Lee ◽  
Jaebum Choo ◽  
Yang S. Kim ◽  
Eun Kyu Lee ◽  
...  
Keyword(s):  
Microfluidic Channel ◽  
Raman Microscopy ◽  
Mixing Behavior ◽  
Confocal Fluorescence ◽  
Passive Mixing

scholarly journals Empirical Modelling of Hydrodynamic Effects on Starch Nanoparticles Precipitation in a Spinning Disc Reactor

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2202 ◽  
Author(s):  
Sahr Sana ◽  
Vladimir Zivkovic ◽  
Kamelia Boodhoo
Keyword(s):  
Particle Size ◽  
Reynolds Number ◽  
Rotational Speed ◽  
Precipitation Process ◽  
Empirical Modelling ◽  
Operating Variables ◽  
Antisolvent Precipitation ◽  
Passive Mixing ◽  
The Difference ◽  
Spinning Disc

Empirical correlations have been developed to relate experimentally determined starch nanoparticle size obtained in a solvent–antisolvent precipitation process with key hydrodynamic parameters of a spinning disc reactor (SDR). Three different combinations of dimensionless groups including a conventional Reynolds number (Re), rotational Reynolds number (Reω) and Rossby number (Ro) have been applied in individual models for two disc surfaces (smooth and grooved) to represent operating variables affecting film flow such as liquid flowrate and disc rotational speed, whilst initial supersaturation (S) has been included to represent varying antisolvent concentrations. Model 1 featuring a combination of Re, Reω and S shows good agreement with the experimental data for both the grooved and smooth discs. For the grooved disc, Re has a greater impact on particle size, whereas Reω is more influential on the smooth disc surface, the difference likely being due to the passive mixing induced by the grooves irrespective of the magnitude of the disc speed. Supersaturation has little impact on particle size within the limited initial supersaturation range studied. Model 2 which characterises both flow rate and disc rotational speed through Ro alone and combined with Re was less accurate in predicting particle size due to several inherent limitations.

scholarly journals Simulating microstructure evolution during passive mixing

2011 ◽  
Vol 5 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Guillaume Maitrejean ◽  
Amine Ammar ◽  
Francisco Chinesta
Keyword(s):  
Microstructure Evolution ◽  
Passive Mixing

scholarly journals A Computational Study on Mixing of Two-Phase Flow in Microchannels

2003 ◽  
Author(s):  
Farshid Bondar ◽  
Francine Battaglia
Keyword(s):  
Computational Study ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Mixing Index ◽  
Wave Type ◽  
Two Phase ◽  
Chaotic Flows ◽  
Two Fluids ◽  
Passive Mixing ◽  
Better Than

The passive mixing of water and alcohol, as two fluids with different densities, is carried out computationally in three-dimensional microchannels. Four designs of microchannels are considered to investigate the efficiency of mixing for Reynolds numbers ranging between 6 and 96. In a straight-type microchannel, mixing is very poor. In a square-wave-type microchannel, mixing is marginally better than the straight one. Mixing in the serpentine-type and twisted-type microchannels develops considerable better than the first two microchannels, especially at higher Reynolds numbers. However, in the twisted microchannel, the mixing index is substantially larger compared to the serpentine microchannel for the Reynolds number of 35. The higher mixing index implies the occurrence of spatially chaotic flows with a higher degree of chaos compared to the case of the serpentine microchannel. The results are compared quantitatively and qualitatively in Eulerian and Lagrangian frameworks and a correlation between Lagrangian chaos and Eulerian chaos is concluded.

scholarly journals A LES Study on Passive Mixing in Supersonic Shear Layer Flows Considering Effects of Baffle Configuration

2014 ◽  
Vol 6 ◽  
pp. 836146 ◽  
Author(s):  
Ren Zhao-Xin ◽  
Wang Bing
Keyword(s):  
Pressure Loss ◽  
Total Pressure ◽  
Large Scale ◽  
Mixing Layer ◽  
Total Pressure Loss ◽  
Mixing Efficiency ◽  
Mixing Enhancement ◽  
Supersonic Mixing ◽  
Passive Mixing ◽  
Supersonic Mixing Layer

Under the background of dual combustor ramjet (DCR), a numerical investigation of supersonic mixing layer was launched, focused on the mixing enhancement method of applying baffles with different geometric configurations. Large eddy simulation with high order schemes, containing a fifth-order hybrid WENO compact scheme for the convective flux and sixth-order compact one for the viscous flux, was utilized to numerically study the development of the supersonic mixing layer. The supersonic cavity flow was simulated and the cavity configuration could influence the mixing characteristics, since the impingement process of large scale structures formed inside the cavity could raise the vorticity and promote the mixing. The effect of baffle's configurations on the mixing process was analyzed by comparing the flow properties, mixing efficiency, and total pressure loss. The baffle could induce large scale vortexes, promote the mixing layer to lose its stability easily, and then lead to the mixing efficiency enhancement. However, the baffle could increase the total pressure loss. The present investigation could provide guidance for applying new passive mixing enhancement methods for the supersonic mixing.

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