Berechnung und Beurteilung strömungsbasierter komplex‐laminarer Mischprozesse

Bothe, Dieter; Warnecke, Hans‐Joachim

doi:10.1002/cite.200700068

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…Any numerical investigation should be accompanied by a grid refinement study in order to demonstrate that the results based on the final grid system are independent of the mesh size. Bothe and Warnecke (2007) strikingly illustrated the critical influence of grid resolution by considering the mixing of two streams of the same liquid (one of them carrying a passive tracer substance) in a T-junction microchannel, see also the book chapter of Bothe (2009) on evaluation and validation of CFD simulations in microchemical applications. Here, we cite and emphasize one important statement.…”

Section: Recommendations and Guidelinesmentioning

confidence: 99%

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Wörner

2012

Microfluid Nanofluid

370

197

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This article presents a comprehensive review of numerical methods and models for interface resolving simulations of multiphase flows in microfluidics and micro process engineering. The focus of the paper is on continuum methods where it covers the three common approaches in the sharp interface limit, namely the volumeof-fluid method with interface reconstruction, the level set method and the front tracking method, as well as methods with finite interface thickness such as color-function based methods and the phase-field method. Variants of the mesoscopic lattice Boltzmann method for two-fluid flows are also discussed, as well as various hybrid approaches. The mathematical foundation of each method is given and its specific advantages and limitations are highlighted. For continuum methods, the coupling of the interface evolution equation with the single-field Navier-Stokes equations and related issues are discussed. Methods and models for surface tension forces, contact lines, heat and mass transfer and phase change are presented. In the second part of this article applications of the methods in microfluidics and micro process engineering are reviewed, including flow hydrodynamics (separated and segmented flow, bubble and drop formation, breakup and coalescence), heat and mass transfer (with and without chemical reactions), mixing and dispersion, Marangoni flows and surfactants, and boiling.

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Section: Recommendations and Guidelinesmentioning

confidence: 99%

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Wörner

2012

Microfluid Nanofluid

370

197

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“…The velocity-weighted mean concentration deviation would be the variance of the undisturbed mixture in a large vessel, in which the channel pours the liquid. Further, characterization methods and tools for flow mixing are reviewed by Bothe and Warnecke in reference [15]. Generally, continuous flow static mixers can be divided into elements contacting the components like the T-mixer and following mixing elements like the 90 • bend.…”

Section: Convective Mixing Elementsmentioning

confidence: 99%

Convective micromixers — design and industrial applications

Kockmann

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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Convective static micromixers operate with high Reynolds numbers ( Re from 100 to 1000) in relatively large microchannels (100–1000 μm) for high flowrates and low risk of fouling and blocking. Typical flow characteristics of symmetrical mixing in T-shaped micromixers are presented with transient flow for Re number larger than 240. The simulation results are assisted by experimental data. Parallel mixing elements increase the mass flowrate up to 25 kg/h with 100 kPa pressure loss. The typical flow characteristics are described, which are essential for successful mixing devices. Three dimensionless parameters are introduced to describe the mixing performance and effectiveness of such devices. Particle generation are critical in microchannels due to fouling issues. The gas phase particle generation from homogeneous condensation of vitamin E acetate is described, reaching to particle diameters of 20 nm from temporal temperature gradients of about 1.6×106 K/s. In liquid phase, the reactive precipitation of BaSO4 is investigated, leading to particle diameters below 100 nm.

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