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Direct measurement of particle inertial migration in rectangular microchannels
Kaitlyn Hood1, Soroush Kahkeshani, Dino Di Carlo
1Department of Mathematics, UCLA, Los Angeles, CA, USA. ektuley@math.ucla.edu.
Lab on a Chip
|June 29, 2016
Summary
Inertial lift forces cause particle migration in microfluidic channels. Experimental results validate theories, showing migration velocities match simulations and asymptotic theory, but no simple scaling with particle size was found.
Area of Science:
- Fluid dynamics
- Microfluidics
- Particle imaging velocimetry
Background:
- Inertial lift forces drive particle migration in microfluidic channels.
- Existing theories for these forces lack sufficient experimental validation.
- Understanding particle behavior is crucial for microfluidic applications.
Purpose of the Study:
- To experimentally measure 3D particle positions and migration velocities.
- To validate theoretical predictions of inertial lift forces.
- To investigate the relationship between particle size and migration.
Main Methods:
- Utilized sub-pixel accurate particle tracking for precise measurements.
- Employed velocimetric reconstruction to determine particle depth.
- Tracked thousands of individual particles in three dimensions.
Main Results:
- Demonstrated that inertial forces do not scale simply with particle size.
- Observed that measured migration velocities align well with numerical simulations.
- Found agreement between experimental data and a two-term asymptotic theory.
Conclusions:
- Experimental validation supports existing theories for inertial lift forces in microfluidics.
- Particle migration is complex and not solely dependent on particle size.
- The developed experimental method accurately captures 3D particle dynamics.
