RGB Color Model Analysis for a Simple Structured Polydimethylsiloxane Pneumatic Micromixer

2021 ◽  
pp. 247263032110088
Author(s):  
Xuling Liu ◽  
Duanqin Zhang ◽  
Jie Liu ◽  
Liangwen Wang ◽  
Songjing Li
Keyword(s):  
Simple Structure ◽  
Model Analysis ◽  
Mixing Efficiency ◽  
Color Model ◽  
Microfluidic Chips ◽  
Mixing Chamber ◽  
Pneumatic Chamber ◽  
Conventional Methods

This article reports mixability experiments and their RGB color model analysis for a simple structured micromixer based on the pneumatic-driven membrane in multiple microreagent mixing applications. First, a novel and simple structure consisting of a mixing chamber and a pneumatic chamber is designed and fabricated of polydimethylsiloxane (PDMS) material, which facilitates integration with microfluidic chips. Then, experiment results and their RGB color model about mixing efficiency are investigated. Compared with conventional methods, the RGB color model for mixing results is easy and intuitive. In addition, the designed micromixer operation relies on less external laboratory infrastructure because of its simple structure.

scholarly journals A comparison between orthodontic model analysis using conventional methods and iModelAnalysis

2018 ◽  
Vol 51 (4) ◽  
pp. 173
Author(s):  
Vita Previa Indirayana ◽  
Gita Gayatri ◽  
N. R. Yuliawati Zenab
Keyword(s):  
Sampling Method ◽  
Model Analysis ◽  
T Test ◽  
Normality Test ◽  
Time Period ◽  
Significant Difference ◽  
The Mean ◽  
Conventional Methods ◽  
Paired T Test ◽  
Dental Casts

Background: Model analysis constitutes an essential aspect of orthodontic diagnostic practice. Pavan has developed an application to simplify the mathematical calculations employed in orthodontic model analysis. Purpose: This study was conducted to obtain the differences in results and time periods of model analysis using conventional means and iModelAnalysis. Methods: The research represented a comparative analytic study. The populations comprised dental casts dating from 2014 in the Orthodontics Laboratory of Padjadjaran University. The samples comprised 31 dental casts which were subjected to a total sampling method consisting of two treatments; a conventional method calculation and one using iModelAnalysis. A normality test was conducted and processed using a paired t-test with α=0.05. Results: The means of arch length discrepancies were 1.64±2.63 mm and 1.37±3.07 mm for the conventional methods and 1.65±2.43mm and 1.42±3.04mm for iModelAnalysis. The results of a Bolton analysis for conventional methods were 78.05±2.69% and 91.93±1.29%, while those for iModelAnalysis were 77.91±2.70% and 91.96±2.13%. A Howes analysis of conventional methods produced a result of 45.56±2.83%, while for an iModelAnalysis one of 45.56±2.85%. Pont analysis for conventional methods was 39.35±0.04 mm and 49.17±2.55 mm, while for iModelAnalysis it was 39.35±0.07 mm and 49.19±2.57mm. The mean of the duration of analysis using conventional methods was 1703.81±56.46 seconds, while for iModelAnalysis it was 990.06±34.87 seconds. A normality test confirmed that the data was normally distributed (p>0.05). The results of a paired sample t-test with p>0.05 showed that there was no significant difference between the results of each analysis, while there was significant difference in the time period of analysis. Conclusion: There was no difference in the analysis results. However, there was difference in the time period of analysis between conventional methods and that of iModelAnalysis.

A Study on Mixing Efficiency in a Two-Channel Circular Micromixer

2006 ◽  
Vol 22 (4) ◽  
pp. 331-338
Author(s):  
M. Chang ◽  
Y.-H. Hu ◽  
S.-W. Chau ◽  
K.-H. Lin
Keyword(s):  
Three Dimensional ◽  
Numerical Prediction ◽  
Mixing Efficiency ◽  
Experimental Measurements ◽  
Inspection Method ◽  
Flow Rates ◽  
Two Fluids ◽  
Finite Volume Discretization ◽  
Mixing Chamber ◽  
Image Inspection

AbstractThe mixing behavior of a two-channel micromixer with a circular mixing chamber at four different chamber depths and six different flow rates had been investigated. Experiments were implemented with the mixings of two fluids. An image inspection method using the variance of the image gray level contrast as the measurement parameter to determine the mixing efficiency distribution in these mixers. The steady, three-dimensional and laminar flow fields inside the micromixers were also simulated numerically with a finite volume discretization. Through the numerical integration over the chamber depth, the three-dimensional numerical prediction could be compressed into a two-dimensional result, which could be directly used to compare with the experimental measurements. Experimental results show that the measured mixing efficiency is raised with the increase of chamber depth. The numerical prediction of mixing efficiency agreed qualitatively with those obtained from the experimental measurements, while the ratio of the depth to diameter of the mixing chamber is big enough to eliminate the viscosity effect.

A Novel Three-Dimensional Passive Micromixer with Replaceable Mixing Chamber

2014 ◽  
Vol 513-517 ◽  
pp. 3090-3093
Author(s):  
He Zhang ◽  
Li Tian ◽  
Xiao Wei Han ◽  
Xiao Wei Liu
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Mixing Efficiency ◽  
Mixing Chamber ◽  
Result Show ◽  
Passive Micromixer ◽  
Left And Right

In this paper, we design and fabricate a three-dimensional passive-micromixer with a replaceable mixing chamber. The rectangular mixing chamber has a dimension of 20 mm × 3 mm in length and width and 2 mm in height, the chamber can be fitted with different microstructures to accelerate mixing. Then, we compare the no structure chamber to left and right interdigitated chamber by using numerical simulation, the result show that the mixing efficiency has been significantly improved. The photomicrographs proved the effectiveness of the design finally.

Triple-Choking Model for Ejector

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
J. Sargolzaei ◽  
M. R. Pirzadi Jahromi ◽  
E. Saljoughi
Keyword(s):  
Theoretical Models ◽  
Mixing Efficiency ◽  
Governing Equations ◽  
Critical Mode ◽  
Cross Sectional ◽  
New Approach ◽  
Mode Operation ◽  
Operation Conditions ◽  
Mixing Chamber ◽  
Good Agreement

In this study, a 1D analysis has been presented for the prediction of ejector performance at critical mode operation. The new triple-choking model has been developed using the governing equations of the compressible fluids and thermodynamics properties based on the frictional adiabatic fluid study. A new approach has been introduced to consider the frictional effects on the mixing efficiencies by extending the 1D ejector theory. A very good agreement has been reported for the R141b and steam experimental data at critical mode operation. Furthermore, simulated results have been compared with some of the recent theoretical models. In addition, the influence of operation conditions on the ejector performance and the required cross-sectional area of the mixing chamber has been showed. Finally, the influence of the operation conditions (such as generator, condenser, and evaporator temperatures) and the size of ejector on the mixing efficiency have been studied.

scholarly journals Study on the Expansion of Primary Flow for the Mixing Uniformity in the Two-Phase Ejector

2021 ◽  
Vol 2097 (1) ◽  
pp. 012012
Author(s):  
Lixing Zheng ◽  
Hongwei Hu ◽  
Changning Mi
Keyword(s):  
Secondary Flow ◽  
Optimization Design ◽  
Entropy Change ◽  
Mixing Efficiency ◽  
Primary Flow ◽  
Two Phase ◽  
Operation Conditions ◽  
Thermodynamic Entropy ◽  
Mixing Chamber ◽  
Flow Pressure

Abstract The expansion of primary flow in the suction chamber of the CO2 two-phase ejector is investigated and its influences on the mixing characteristics are analyzed. An ejector model is developed, by constructing differential equations for mass, momentum and energy then get the governing equation. In the suction chamber, the expansion of primary flow and the compression of secondary flow are modeled along the flow path. Based on the constant-pressure mixing theory, the pressure equilibrium positions of two stream (namely at the inlet and inside of mixing chamber, respectively) are considered. The mass and energy transfer in the mixing chamber were analyzed by using the double-flow model formulation. The ejector performance parameters are obtained for the different operation conditions, and the distributions of temperature and velocity of two streams in the mixing chamber are presented. The simulation results showed the influence of primary flow expansion on the pressure lift ratio was relatively obvious, and the larger expansion distance was helpful to improve the mixing efficiency and decrease the thermodynamic entropy change during the mixing. Moreover, the temperature of secondary flow for lower primary flow pressure presented larger descent rates at the initial of mixing. This work is helpful for the improvement of ejector theoretical model and the optimization design.

Model analysis of gas distribution within human lung acinus

1984 ◽  
Vol 56 (2) ◽  
pp. 418-425 ◽  
Author(s):  
M. Paiva ◽  
L. A. Engel
Keyword(s):  
Molecular Diffusion ◽  
Human Lung ◽  
Model Analysis ◽  
Normal Lung ◽  
Mixing Efficiency ◽  
Breath Hold ◽  
Branch Points ◽  
Single Breath ◽  
Branching Model

Alveolar gas concentrations were simulated in an asymmetrically branching model of a human lung acinus based on morphometric measurements. The structure was expansile so that convective flow into and out of every part was proportional to its volume. Despite the homogeneous volume change solution of a differential equation for simultaneous convection and molecular diffusion following a 1-liter breath of O2 at 0.5 l/s predicted substantial inhomogeneity of O2 concentrations. This was reflected in a twofold range of inspired gas per unit volume computed from O2 concentrations averaged throughout expiration. Even a 10-s breath hold at end inspiration did not result in uniform concentrations. Larger breaths, corresponding to a ventilation of 60 l/min, increased the degree of inhomogeneity 50%. Diffusive pendelluft at intra-acinar branch points during expiration produced a sloping alveolar plateau of 0.53% N2/l, i.e., much smaller than that measured from the whole lung in vivo. Similarly, an estimate of single-breath mixing efficiency also indicated a much smaller degree of inhomogeneity than inferred from measurements of expired gases at the mouth. The model analysis suggests that if anatomical data used are representative of a normal lung, then the intra-acinar gas inhomogeneity, although substantial, constitutes a small fraction of the overall impairment in gas mixing.

Study on Mechanism of Strengthened Vortex Diffusion for a Punched Agitator

2011 ◽  
Vol 221 ◽  
pp. 694-700 ◽  
Author(s):  
Jian Guo Chen ◽  
De Yu Luan ◽  
Xiao Chen Zhu
Keyword(s):  
Energy Dissipation ◽  
Simple Structure ◽  
Projection Area ◽  
Mixing Efficiency ◽  
Broad Application ◽  
Liquid Suspension ◽  
Vortex Theory ◽  
Solid Liquid ◽  
Vortex Diffusion ◽  
Application Prospects

The mixing mechanism of a punched agitator used in solid-liquid suspension system was studied basing on the enstrophy and energy dissipation of the vortex theory. The effects of the configuration parameters on stirring performance were discussed. The results show that efflux from such punched agitator with simple structure can not only strengthen vortex diffusion, but also reduce the power consumption by diminishing the projection area in the direction which the paddles round. Obviously, this is beneficial to lower critical suspension velocity and promote mixing efficiency in stirring tank. It is indicated that the punched agitator owning quite broad application prospects.

scholarly journals CFD Analysis Diesel Spray Mixing Nozzle in Various Angle

2021 ◽  
Vol 12 (1S) ◽  
pp. 478-490
Author(s):  
N.Kalaimani, Et. al.
Keyword(s):  
Spray Angle ◽  
Diesel Spray ◽  
Mixing Efficiency ◽  
Cfd Analysis ◽  
Mixing Ratios ◽  
Mixing Chamber ◽  
Ic Engines

The main objective of this project is finding the optimized mixed ratio of the diesel spray mixer in the IC Engines, CFD Methodology is used for this analysis the spray angle variations give the various mixing ratios of the sprayer for better combustion ratios the turbulence will decide the best mixing efficiency, the turbulence, pressure and velocity results inside the mixing chamber is analyze through CFD methodology

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