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Pressure-driven laminar flow in tangential microchannels: an elastomeric microfluidic switch
R F Ismagilov1, T D Rosmarin, J A Kenis
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Analytical Chemistry
|October 19, 2001
Summary
This study details controlling laminar fluid flow in microfluidic channels using channel geometry and fluid injection. Two novel microfluidic switches are presented for precise flow manipulation.
Area of Science:
- Fluid dynamics
- Microfluidics
- Materials science
Background:
- Microfluidic devices enable precise control over small fluid volumes.
- Tangential fluid flow in microchannels presents unique control challenges.
- Elastomeric microstructures offer tunable properties for fluidic applications.
Purpose of the Study:
- To describe laminar fluid flow through a 3D elastomeric microstructure with tangentially contacting microchannels.
- To present two methods for controlling fluid flow in these microchannels.
- To provide theoretical explanations for observed flow behaviors.
Main Methods:
- Fabrication of a three-dimensional elastomeric microstructure with intersecting microchannels.
- Experimental investigation of laminar fluid flow profiles.
- Theoretical analysis of flow dependence on channel aspect ratio and fluid injection.
Main Results:
- Flow profiles are sensitive to channel aspect ratio, controllable via external pressure.
- Flow direction in multiphase flow depends on lateral stream position, adjustable by injecting additional fluids.
- Two distinct microfluidic switches were successfully demonstrated.
Conclusions:
- Laminar fluid flow in tangentially connected microchannels can be effectively controlled.
- Channel aspect ratio and strategic fluid injection are key parameters for flow manipulation.
- The developed microfluidic switches offer precise control for microfluidic applications.