NDLI: Liquid Mixing in Static Micro Mixers With Various Cross Sections

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kockmann, Norbert Engler, Michael Fo¨ll, Claus Woias, Peter
Copyright Year	2003
Abstract	Micro mixers are an integral part of several micro fluidic devices like micro reactors or analytical equipment. Due to the small dimensions, laminar flow is expected a priori in those devices while the mass transfer is supposed to be dominated by diffusion. A detailed numerical CFD-study by CFDRC-ACE+ of simple static mixers shows a significant deviation from strictly laminar flow in a wide range of Reynolds numbers Re, channel dimensions, and types of cross sections (square, rectangular, trapezoidal). With increasing flow velocity and Re number the flow starts to form vortexes at the entrance of the mixing channel. The vortexes are symmetrical to the symmetry planes of the mixing channel, both for the rectangular and the trapezoidal cross sections investigated here. With further increasing velocity the flow tends to instabilities, which causes a breakup of the flow symmetry. These instabilities are generally found in T-shape mixers with symmetrical flow conditions, but not always in Y-shape mixers or with asymmetrical flow conditions. Within the laminar flow regime diffusive mass transfer is dominant. In this case the mixing quality at constant channel length becomes worse with increasing velocity. This effect can almost be equalized by the onset of the vortex regime, which enhances the mass transfer by convective transport. This paper shows the mixing quality at a certain length for different geometrical parameters and flow conditions.
Sponsorship	Nanotechnology Institute
Starting Page	911
Ending Page	918
Page Count	8
File Format	PDF
ISBN	0791836673
DOI	10.1115/ICMM2003-1121
Volume Number	1st International Conference on Microchannels and Minichannels
Conference Proceedings	ASME 2003 1st International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2003-04-24
Publisher Place	Rochester, New York, USA
Access Restriction	Subscribed
Subject Keyword	Computational fluid dynamics Reynolds number Dimensions Flow (dynamics) Diffusion (physics) Mass transfer Cross section (physics) Laminar flow Vortices Mixing quality Fluidic devices Symmetry (physics) Shapes
Content Type	Text
Resource Type	Article

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