Numerical and experimental investigations on liquid mixing in static micromixers

Engler, Michael; Kockmann, Norbert; Kiefer, Thomas; Woias, Peter

doi:10.1016/j.cej.2003.10.017

Cited by 289 publications

(176 citation statements)

References 8 publications

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“…Engler et al [28] have experimentally demonstrated the existence of a critical Reynolds number at which Dean vortices in microchannels lose symmetry. It has been found that for a 600 μm × 300 μm × 300 μm channel, the critical Reynolds number is about 150.…”

Section: Fluid Mixing At Moderate Reynolds Numbersmentioning

confidence: 99%

Modeling and Optimization of Y-Type Micromixers

Rudyak

Минаков

2014

Micromachines

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A trend in the global technological progress in the last few decades is the development of microsystem technology, microelectromechanical systems and corresponding technologies. Fluid mixing is an extremely important process widely used in various microfluidic devices (chemical microreactors, chemical and biological analyzers, drug delivery systems, etc.). To increase the mixing rate, it is necessary to use special devices: micromixers. This paper presents the results of a hydrodynamic simulation of Y-shaped micromixers. Flows are analyzed for both low and moderate Reynolds numbers. The passive and active mixers are considered. The dependence of the mixing efficiency on the Reynolds and Péclet numbers, as well as the possibility of using the hydrophobic and ultra-hydrophobic coatings is analyzed. Five different flow regimes were identified: (1) stationary vortex-free flow (Re < 5); (2) stationary symmetric vortex flow with two horseshoe vortices (5 < Re < 150); (3) stationary asymmetric vortex flow (150 < Re < 240); (4) non-stationary periodic flow (240 < Re < 400); and (5) stochastic flow (Re > 400). The maximum mixing efficiency was obtained for stationary asymmetric vortex flow.

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Section: Fluid Mixing At Moderate Reynolds Numbersmentioning

confidence: 99%

Modeling and Optimization of Y-Type Micromixers

Rudyak

Минаков

2014

Micromachines

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“…The flow is laminar, and the streamlines are scarcely bent and follow the channel walls. 14 In the mixing channel heat transfer zone, thermal diffusion and convection dominate in the thermal mixing processes. The thermal mixing is greatly enhanced due to the enough residence time provided by the long mixing channel.…”

Section: Analytical Modelmentioning

confidence: 99%

“…[10][11][12] Wong et al 13 fabricated and tested a micro-T-mixer as a rapid mixing micromixer. Kockmann and co-workers 14,15 carried out numerical simulations and experimental studies on mixing in a T-shaped micromixer. Three flow regimes were distinguished, which were named as strictly laminar flow, symmetrical vortex flow, and engulfment flow depending on the Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Thermal mixing of two miscible fluids in a T-shaped microchannel

Wong

Nguyen

et al. 2010

Biomicrofluidics

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In this paper, thermal mixing characteristics of two miscible fluids in a T-shaped microchannel are investigated theoretically, experimentally, and numerically. Thermal mixing processes in a T-shaped microchannel are divided into two zones, consisting of a T-junction and a mixing channel. An analytical two-dimensional model was first built to describe the heat transfer processes in the mixing channel.In the experiments, de-ionized water was employed as the working fluid. Laser induced fluorescence method was used to measure the fluid temperature field in the microchannel. Different combinations of flow rate ratios were studied to investigate the thermal mixing characteristics in the microchannel. At the T-junction, thermal diffusion is found to be dominant in this area due to the striation in the temperature contours. In the mixing channel, heat transfer processes are found to be controlled by thermal diffusion and convection. Measured temperature profiles at the T-junction and mixing channel are compared with analytical model and numerical simulation, respectively.

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“…To increase the mixing velocity in the microchannel, an excitation of circulations in the flow and a curvature of the flow lines can be used. Engel et al [3] and Kockmann et al [4] have discovered that flow in microchannels has three flow regimes: layered laminar flow, vortex flow, and stationary asymmetric vortex flow. In the first case, lines of flow move through the channel with minimal distortion.…”

Section: Introductionmentioning

confidence: 99%

Influence of perturbance frequency on intensity of mixing of fluids in microchannel devices

Kravtsova

Meshalkin

2017

EPJ Web Conf.

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Abstract. Influence of perturbation frequency on mixing flow velocity and the varying flow structure in T-shape microchannels are investigated using laser induced fluorescence. The external disturbances of flow are created excitation system based on the piezoelectric actuator. Several increases in mixing efficiency were common to all regimes, but also some different features, were observed. For the stationary vortex flow regime, we obtained a decrease in mixing efficiency of 10% at a frequency of 650Hz. For the stationary asymmetric vortex flow regime, the mixing efficiency increases by 33% and 23% for the frequencies 500Hz and 800 Hz, respectively. For Re=400 and Re=300, the flow structures without disturbance are virtually identical; however, in the case of external influence for the quasiperiodic unsteady flow regime, the mixing efficiency decreases by 22% and 29% at distances of 1 and 5 calibres, respectively, for frequency of 1000 Hz.

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Numerical and experimental investigations on liquid mixing in static micromixers

Cited by 289 publications

References 8 publications

Modeling and Optimization of Y-Type Micromixers

Modeling and Optimization of Y-Type Micromixers

Thermal mixing of two miscible fluids in a T-shaped microchannel

Influence of perturbance frequency on intensity of mixing of fluids in microchannel devices

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