NDLI: Capabilities and limitations of 2-dimensional and 3-dimensional numerical methods in modeling the fluid flow in sudden expansion microchannels

Content Provider	Springer Nature Link
Author	Tsai, Chien Hsiung Chen, Han Taw Wang, Yao Nan Lin, Che Hsin Fu, Lung Ming
Copyright Year	2006
Abstract	This paper deals with computational and experimental investigations into pressure-driven flow in sudden expansion microfluidic channels. Improving the design and operation of microfluidic systems requires that the capabilities and limitations of 2-dimensional (2-D) and 3-dimensional (3-D) numerical methods in simulating the flow field in a sudden expansion microchannel be well understood. The present 2-D simulation results indicate that a flow separation vortex forms in the corner behind the sudden expansion microchannel when the Reynolds number is very low (Re∼0.1). However, the experimental results indicate that this prediction is valid only in the case of a sudden expansion microchannel with a high aspect ratio (aspect ratio >> 1). 3-D computational fluid dynamics simulations are performed to predict the critical value of Re at which the flow separation vortex phenomenon is induced in sudden expansion microchannels of different aspect ratios. The experimental flow visualization results are found to be in good agreement with the 3-D numerical predictions. The present results provide designers with a valuable guideline when choosing between 2-D or 3-D numerical simulations as a means of improving the design and operation of microfluidic devices.
Starting Page	13
Ending Page	18
Page Count	6
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	3
Issue Number	1
e-ISSN	16134990
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sudden expansion microchannel Reynolds numbers Flow separation vortex Engineering Thermodynamics, Transport Phenomena Mechanics, Fluids, Thermodynamics Nanotechnology Polymer Sciences Medical Microbiology Engineering Fluid Dynamics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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