Numerical Analysis of Mixing Performance in Microchannel with Different Ratio of Outlet to Inlet Width

2019 ◽  
pp. 257-266 ◽  
Author(s):  
Bappa Mondal ◽  
Sukumar Pati ◽  
Promod Kumar Patowari
Keyword(s):  
Numerical Analysis ◽  
Mixing Performance

Improved Serpentine Laminating Micromixer: Numerical Investigation and Experimental Verification

2007 ◽  
Author(s):  
Jang Min Park ◽  
Dong Sung Kim ◽  
Tae Gon Kang ◽  
Tai Hun Kwon
Keyword(s):  
Numerical Analysis ◽  
Experimental Verification ◽  
Flow Characteristics ◽  
Chaotic Advection ◽  
Intensity Change ◽  
Chaotic Mixing ◽  
Cross Sectional ◽  
Mixing Performance ◽  
Optical Micrograph ◽  
Particle Tracking Method

It is a difficult task to achieve an efficient mixing inside a microchannel since the flow is characterized by low Reynolds number (Re). Recently, the serpentine laminating micromixer (SLM) was reported to achieve an efficient chaotic mixing by introducing ‘F’-shape mixing units successively in two layers such that two chaotic mixing mechanisms, namely splitting/recombination and chaotic advection, enhance the mixing performance in combination. The present study describes an improved serpentine laminating micromixer (ISLM) with a novel redesign of the ‘F’-shape mixing unit. Reduced cross-sectional area at the recombination region of ISLM locally enhances advection effect which helps better vertical lamination, resulting in improved mixing performance. Flow characteristics and mixing performances of SLM and ISLM are investigated numerically and verified experimentally. Numerical analysis system is developed based on a finite element method and a colored particle tracking method, while mixing entropy is adopted as a quantitative mixing measure. Numerical analysis result confirms enhanced vertical lamination performance and consequently improved mixing performance of ISLM. For experimental verification, SLM and ISLM were fabricated by polydimethylsiloxane (PDMS) casting against SU-8 patterned masters. Mixing performance is observed by normalized red color intensity change of phenolphthalein along the downchannel. Flow characteristics of SLM and ISLM are investigated by tracing the red interface of two streams via optical micrograph. The normalized mixing intensity behavior confirms improved mixing performance of ISLM, which is consistent with numerical analysis result.

3-D numerical analysis on the mixing performance for assemblies with filled zone of right-handed and left-handed double-flighted screws and kneading blocks in twin-screw extruders

2002 ◽  
Vol 42 (4) ◽  
pp. 707-723 ◽  
Author(s):  
Kazumori Funatsu ◽  
Shin-Ichi Kihara ◽  
Masaru Miyazaki ◽  
Shingo Katsuki ◽  
Toshihisa Kajiwara
Keyword(s):  
Numerical Analysis ◽  
Twin Screw Extruders ◽  
Mixing Performance ◽  
Left Handed ◽  
Twin Screw ◽  
Screw Extruders

Numerical Mixing Analysis of a Vaned Circular Micromixer

2006 ◽  
Author(s):  
Richard Bergman ◽  
Alexander Efremov ◽  
Pierre Woehl
Keyword(s):  
Numerical Analysis ◽  
Turbulent Mixing ◽  
Parametric Study ◽  
Large Scale ◽  
Acceptable Level ◽  
Mixing Efficiency ◽  
Mixing Process ◽  
Mixing Performance ◽  
Numerical Mixing ◽  
Cutting And Stacking

Mixing of fluids is a common and often critical step in microfluidic systems. In typical large scale processes turbulence greatly speeds the mixing process. At the mini and micro-scales, however, the flow is laminar and the benefits of turbulent mixing are not present. Mixing at the mini- and micro-scales tends to become a more highly engineered process of bringing fluids together in predictable ways to achieve a predetermined and acceptable level of mixing. This paper summarizes a numerical analysis of the mixing performance of a vaned circular micromixer. A newly developed mixing metric suitable for reacting fluids is developed for this study. Applying the basic steps of stretching, cutting, and stacking to effect mixing, a useful micromixer is analyzed numerically for its mixing efficiency. A parametric study of flow and viscosity indicate that a flow Re of 12 or higher is sufficient to achieve effective and rapid mixing in this device.

Numerical analysis of mixing performance of mixing section in pin-barrel single-screw extruder

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Jinnan Chen ◽  
Pan Dai ◽  
Hui Yao ◽  
Tung Chan
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Flow Field ◽  
Residence Time ◽  
Particle Tracking ◽  
Mixing Efficiency ◽  
Screw Extruder ◽  
Mixing Performance ◽  
Single Screw ◽  
Single Screw Extruder

Abstract Using the finite elements method, numerical simulations of the flow field of a rubber melt in the mixing sections of a conventional full-flight single-screw extruder and a pin-barrel single-screw extruder were carried out. Particle tracking analysis was used to statistically analyze the mixing state of the rubber melt in the mixing section with pin and that without pin. The mixing performance of both types of mixing section was quantitatively evaluated. The results show that the pins partially disorganize the particle trajectories, change the particle moving directions, and enhance the mixing performance. The particle residence time is longer in the mixing section with pins than in the mixing section with no pin, leading to better mixing in the former. The distributive mixing of particles in both types of mixing section was statistically analyzed. The pins increase the efficiency of stretching and the time-averaged efficiency of stretching, and hence the mixing efficiency. However, further increase in the number of pins does not necessarily enhance the mixing performance.

scholarly journals Mixing performance in Split-And-Recombine Milli-Static Mixers—A numerical analysis

2019 ◽  
Vol 142 ◽  
pp. 298-306 ◽  
Author(s):  
Charbel Habchi ◽  
Akram Ghanem ◽  
Thierry Lemenand ◽  
Dominique Della Valle ◽  
Hassan Peerhossaini
Keyword(s):  
Numerical Analysis ◽  
Static Mixers ◽  
Mixing Performance

NUMERICAL ANALYSIS ON THE MIXING PERFORMANCE OF A NOVEL EFFUSION-TYPE MICROMIXER

2007 ◽  
Vol 14 (3) ◽  
pp. 245-266
Author(s):  
Fuh-Lin Lih ◽  
Tsung-Sheng Sheu ◽  
Jr-Ming Miao
Keyword(s):  
Numerical Analysis ◽  
Mixing Performance

Effect of Electrode Configurations on the Performance of Electro-Hydrodynamic Micromixer

2018 ◽  
Author(s):  
Hak-Sun Kim ◽  
Hyun-Oh Kim ◽  
Youn-Jea Kim
Keyword(s):  
Numerical Analysis ◽  
Chemical Engineering ◽  
Fine Particles ◽  
Comsol Multiphysics ◽  
Mixing Efficiency ◽  
Flow Conditions ◽  
Mixing Performance ◽  
Zeta Potentials ◽  
Particle Mixing ◽  
Geometrical Effects

Micromixers are widely used in chemical engineering and bioengineering industries. In this study, geometrical effects of electrodes were investigated to mix fine particles affected by external electric field. In order to improve the particle mixing performance of micromixer, the electroosmosis effect could be utilized with configuration of electrodes at the top and bottom of microchannel. Numerical analysis was performed to derive the pattern of electrodes with superior mixing efficiency by changing voltages and zeta potentials applied to the micromixer channel, by using COMSOL Multiphysics 5.2. The results of mixing performance were graphically depicted with various arrangements of electrode and flow conditions.

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