The understanding of the flow processes in microchannels and micro mixers is essential for the design of micro fluidic devices like micro reactors or analytical equipment. We have performed a systematic numerical CFD-study of mixing and mass transfer in sharp 90° bends and heat transfer in T-joints to obtain a detailed insight into the flow patterns and corresponding transfer processes in a wide range of Reynolds numbers. With increasing flow velocity the straight laminar flow starts to form symmetrical vortices in the bend, at the entrance of the mixing channel, and in T-joints. The vortices enhance the transport processes like heat and mass transfer in the channels significantly. The influence of the geometry and the flow conditions is shown by an analytical estimation of the relevant forces. The appearance of convective transport processes is used for the definition of microflows which are controlled by viscous forces and diffusive transfer processes.
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ASME 2004 2nd International Conference on Microchannels and Minichannels
June 17–19, 2004
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4164-2
PROCEEDINGS PAPER
Fluid Dynamics and Transfer Processes in Bended Micro Channels
Norbert Kockmann,
Norbert Kockmann
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
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Michael Engler,
Michael Engler
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
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Daniel Haller,
Daniel Haller
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
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Peter Woias
Peter Woias
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
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Norbert Kockmann
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
Michael Engler
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
Daniel Haller
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
Peter Woias
Albert-Ludwigs-Universita¨t Freiburg, Freiburg, Germany
Paper No:
ICMM2004-2331, pp. 165-171; 7 pages
Published Online:
December 2, 2008
Citation
Kockmann, N, Engler, M, Haller, D, & Woias, P. "Fluid Dynamics and Transfer Processes in Bended Micro Channels." Proceedings of the ASME 2004 2nd International Conference on Microchannels and Minichannels. ASME 2nd International Conference on Microchannels and Minichannels. Rochester, New York, USA. June 17–19, 2004. pp. 165-171. ASME. https://doi.org/10.1115/ICMM2004-2331
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