Laminar Fluid Chaotic Mixing in Three-Dimensional Continuous Flow Domains

2001 ◽  
Vol 16 (4) ◽  
pp. 368-375
Author(s):  
M. M. Overd ◽  
S. C. Generalis
Keyword(s):  
Continuous Flow ◽  
Three Dimensional ◽  
Chaotic Mixing

Continuous-Flow Chemical Processing in Three-Dimensional Microchannel Network for On-Chip Integration of Multiple Reactions in a Combinatorial Mode

2005 ◽  
Vol 24 (6) ◽  
pp. 742-757 ◽  
Author(s):  
Yoshikuni Kikutani ◽  
Masaharu Ueno ◽  
Hideaki Hisamoto ◽  
Manabu Tokeshi ◽  
Takehiko Kitamori
Keyword(s):  
Continuous Flow ◽  
Three Dimensional ◽  
Chemical Processing ◽  
Multiple Reactions ◽  
On Chip

Chaotic Mixing in Three-Dimensional Micro Channel

2008 ◽  
Author(s):  
Thuy Hong Van-Le ◽  
Sangmo Kang ◽  
Yong Kweon Suh ◽  
Yangyang Wang
Keyword(s):  
Particle Tracking ◽  
Concentration Distribution ◽  
Initial Conditions ◽  
Three Dimensional ◽  
Half Period ◽  
Chaotic Mixing ◽  
Micro Channel ◽  
Step Method ◽  
Fractional Step Method ◽  
Modulation Period

The quality of chaotic mixing in three-dimensional micro channel flow has been numerically studied using Fractional-step method (FSM) and particle tracking techniques such as Poincare´ section and Lyapunov exponents. The flow was driven by pressure distribution and the chaotic mixing was generated by applying alternating current to electrodes embedded on the bottom wall at a first half period and on the top wall at a second half period. The equations governing the velocity and concentration distributions were solved using FSM based on Finite Volume approach. Results showed that the mixing quality depended significantly on the modulation period. The modulation period for the best mixing performance was determined based on the mixing index for various initial conditions of concentration distribution. The optimal values of modulation period obtained by the particle tracking techniques were compared with those from the solution of concentration distribution equation using FSM and CFX software and the comparison showed their good match.

Continuous-Flow Electrokinetic-Assisted Plasmapheresis by Using Three-Dimensional Microelectrodes Featuring Sidewall Undercuts

2016 ◽  
Vol 88 (10) ◽  
pp. 5197-5204 ◽  
Author(s):  
Xiaoxing Xing ◽  
Minghao He ◽  
Huihe Qiu ◽  
Levent Yobas
Keyword(s):  
Continuous Flow ◽  
Three Dimensional

Three-Dimensional Chaotic Mixing of Fluids in a Cylindrical Cavity

1995 ◽  
Vol 117 (4) ◽  
pp. 582-588 ◽  
Author(s):  
K. C. Miles ◽  
B. Nagarajan ◽  
D. A. Zumbrunen
Keyword(s):  
Cylindrical Cavity ◽  
Chaotic Behavior ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Creeping Flow ◽  
Chaotic Mixing ◽  
Mixing Processes ◽  
Video Images ◽  
Return Maps ◽  
Neutrally Buoyant

Three-dimensional chaotic mixing of Newtonian fluids in a previously uninvestigated cylindrical cavity was studied both experimentally and numerically for creeping flow conditions. Such mixing processes have practical application to the blending of viscous fluids, biological suspensions, or can be used as test beds to study waterborne pollutant formation. A mixing chamber was fabricated which consisted of a cylindrical glass cavity with independently rotating upper and lower circular disks. Fluid motion was revealed by digitizing successive video images of a small neutrally buoyant sphere placed into the mixing cavity and also by photographing dyed blobs. Experimental particle tracking studies were supplemented by numerical simulations. Phase-space trajectories, return maps, and Lyapunov exponents were used to characterize the mixing process and to confirm chaotic behavior.

scholarly journals A Novel High-Throughput Chaotic Advection Microreactor for the Preparation of Uniform BaSO4 Nanoparticles

2021 ◽  
Author(s):  
Hua Yang ◽  
Shi-Xiao Wei ◽  
Han Chen ◽  
Lang Chen ◽  
Chak-tong Au ◽  
...  
Keyword(s):  
High Throughput ◽  
Three Dimensional ◽  
Volumetric Flow Rate ◽  
Secondary Flows ◽  
Chaotic Advection ◽  
Narrow Particle Size Distribution ◽  
Chaotic Mixing ◽  
Mixing Efficiency ◽  
Size Uniformity ◽  
Average Size

Owing to high mixing efficiency, microreactors are used to synthesize uniform BaSO4 nanoparticles, but application in industrial scale is limited due to poor throughput. In this work, a high-throughput passive four-stage asymmetric oscillating feedback microreactor using chaotic mixing mechanism was developed to prepare BaSO4 nanoparticles of high size uniformity. Three-dimensional unsteady simulations showed that chaotic mixing could be induced by three unique secondary flows (i.e., vortex, recirculation, and oscillation), and the fluid oscillation mechanism was examined in detail. Simulations and Villermaux-Dushman experiments indicate that almost complete mixing in molecular level could be achieved when total volumetric flow rate Qtotal was larger than 10 mL/min, and the prepared BaSO4 nanoparticles were with narrow particle size distribution (PSD). Through the adjustment of Qtotal and reactant concentrations, it is easy to control the average size. An average size of 26 nm with narrow PSD could be achieved at Qtotal = 160 mL/min.

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