Development of a Electro-Osmotic Micromixer for Uniform and Rapid Mixing

2012 ◽  
Author(s):  
Yogendra M. Panta ◽  
Param C. Adhikari ◽  
Sanket Aryal
Keyword(s):  
Chemical Species ◽  
Average Concentration ◽  
Geometrical Parameters ◽  
Mixing Zone ◽  
Original Design ◽  
Mixing Performance ◽  
Micro Total Analysis Systems ◽  
Total Analysis ◽  
Geometric Variables ◽  
Over Time

Micro Total Analysis Systems (μTAS) require rapid yet homogeneous mixing of a number of fluid streams that carry bio/chemical species in the solution. Current analysis has been continued from our previously published work [1]. New models were designed by rendering some particular fluid and geometric variables from the original design and then analyzed for the degree of mixing effectiveness. A careful placement of obstacles in the mixing zone of the model and the electrodes in it showed enhancement in mixing performance. In addition, models with varied geometrical parameters such as converging inlet and diverging outlet yielded even better mixing capabilities. Concentration variances over time at the outlet were simultaneously compared in all models for mixing. Also average concentration was tracked over time so as to confirm the uniformity in mixing. The concentration variances at the outlet have been dramatically observed to be reduced by a factor of at least 10 from our designs as reported earlier [1].

Design of Efficient Electroosmotic Micromixer

2011 ◽  
Author(s):  
Yogendra M. Panta ◽  
Param C. Adhikari
Keyword(s):  
Chemical Species ◽  
Channel Width ◽  
Mixing Process ◽  
Concentration Variance ◽  
Model Library ◽  
Micro Total Analysis Systems ◽  
Total Analysis ◽  
Main Model ◽  
Over Time

Micro-bio/chemical applications in a μTAS (Micro Total Analysis Systems) require rapid and uniform mixing of a number of fluid streams that carries bio/chemical species in the solution. An electro osmotic mixer from COMSOL model library is taken as a main model from which other alterations are designed for optimization. The circular, square and elliptical mixers were modeled to see the variation in the mixing. We analyzed the mixing process by varying the mixing shape, concentration, mixing channel width and electrode pairs. Concentration variance at the outlet over time was studied to determine the extent of mixing.

scholarly journals Understanding Interdependencies between Mechanical Velocity and Electrical Voltage in Electromagnetic Micromixers

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 636 ◽  
Author(s):  
Noori Kim ◽  
Wei Xuan Chan ◽  
Sum Huan Ng ◽  
Yong-Jin Yoon ◽  
Jont B. Allen
Keyword(s):  
Fluorescent Dyes ◽  
Mixing Time ◽  
Electrical Measurement ◽  
Micro Electro Mechanical Systems ◽  
Mixing Performance ◽  
Micro Total Analysis Systems ◽  
Mechanical Behaviours ◽  
Total Analysis ◽  
Critical Components ◽  
Insight Into

Micromixers are critical components in the lab-on-a-chip or micro total analysis systems technology found in micro-electro-mechanical systems. In general, the mixing performance of the micromixers is determined by characterising the mixing time of a system, for example the time or number of circulations and vibrations guided by tracers (i.e., fluorescent dyes). Our previous study showed that the mixing performance could be detected solely from the electrical measurement. In this paper, we employ electromagnetic micromixers to investigate the correlation between electrical and mechanical behaviours in the mixer system. This work contemplates the “anti-reciprocity” concept by providing a theoretical insight into the measurement of the mixer system; the work explains the data interdependence between the electrical point impedance (voltage per unit current) and the mechanical velocity. This study puts the electromagnetic micromixer theory on a firm theoretical and empirical basis.

scholarly journals Glass based Micro Total Analysis Systems: Materials, Fabrication methods, and Applications

2021 ◽  
pp. 129859
Author(s):  
Tao Tang ◽  
Yapeng Yuan ◽  
Yaxiaer Yalikun ◽  
Yochiroh Hosokawa ◽  
Ming Li ◽  
...  
Keyword(s):  
Micro Total Analysis Systems ◽  
Total Analysis

scholarly journals Differential Diffusivity Effects in Reactive Convective Dissolution

Fluids ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 83 ◽  
Author(s):  
V. Loodts ◽  
H. Saghou ◽  
B. Knaepen ◽  
L. Rongy ◽  
A. De Wit
Keyword(s):  
Diffusion Coefficients ◽  
Reaction Rate ◽  
Chemical Species ◽  
Mixing Zone ◽  
Simultaneous Presence ◽  
Dynamic Effects ◽  
Density Profiles ◽  
Differential Diffusion ◽  
Different Types ◽  
Double Diffusive

When a solute A dissolves into a host fluid containing a reactant B, an A + B → C reaction can influence the convection developing because of unstable density gradients in the gravity field. When A increases density and all three chemical species A, B and C diffuse at the same rate, the reactive case can lead to two different types of density profiles, i.e., a monotonically decreasing one from the interface to the bulk and a non-monotonic profile with a minimum. We study numerically here the nonlinear reactive convective dissolution dynamics in the more general case where the three solutes can diffuse at different rates. We show that differential diffusion can add new dynamic effects like the simultaneous presence of two different convection zones in the host phase when a non-monotonic profile with both a minimum and a maximum develops. Double diffusive instabilities can moreover affect the morphology of the convective fingers. Analysis of the mixing zone, the reaction rate, the total amount of stored A and the dissolution flux further shows that varying the diffusion coefficients of the various species has a quantitative effect on convection.

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