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Updated: Jul 2, 2026

Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis

Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis

Published on: September 3, 2013

Isolating segregation mechanisms in a split-bottom cell.

K M Hill¹, Yi Fan

¹St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota 55414, USA.

Physical Review Letters

|September 4, 2008

Summary

This summary is machine-generated.

Gravity alone does not cause particle size segregation in sheared granular mixtures. Velocity gradients, however, drive segregation by size and density, with exponential approach to the final state.

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Area of Science:

Physics
Materials Science
Chemical Engineering

Background:

Granular mixtures exhibit complex behaviors under shear.
Understanding segregation mechanisms is crucial for industrial processes.

Purpose of the Study:

To investigate the driving forces behind segregation in sheared granular mixtures.
To differentiate the roles of gravity, porosity, and velocity gradients.

Main Methods:

Experiments using a split-bottom cell.
Analysis of densely sheared granular mixtures.
Observation of particle size and density segregation.

Main Results:

Gravity alone is insufficient for particle size segregation without significant porosity.
Velocity gradients effectively drive segregation based on both particle size and material density.
Segregation dynamics follow an exponential approach to the final state.

Conclusions:

Velocity gradients are a primary driver of segregation in sheared granular flows.
Porosity plays a critical role in gravity-driven segregation.
The study provides insights into controlling granular mixture behavior.