NDLI: Fluid Dynamics and Transfer Processes in Bended Micro Channels

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kockmann, Norbert Engler, Michael Haller, Daniel Woias, Peter
Copyright Year	2004
Abstract	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.
Sponsorship	Nanotechnology Institute
Starting Page	165
Ending Page	171
Page Count	7
File Format	PDF
ISBN	0791841642
DOI	10.1115/ICMM2004-2331
Volume Number	ASME 2nd International Conference on Microchannels and Minichannels
Conference Proceedings	ASME 2004 2nd International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2004-06-17
Publisher Place	Rochester, New York, USA
Access Restriction	Subscribed
Subject Keyword	Fluid dynamics Computational fluid dynamics Reynolds number Flow (dynamics) Mass transfer Microchannels Design Geometry Heat Laminar flow Vortices Fluidic devices Transport processes Symmetry (physics) Heat transfer
Content Type	Text
Resource Type	Article

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