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Related Experiment Video

Updated: Sep 29, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Viscoelastic Particle Focusing and Separation in a Spiral Channel.

Haidong Feng¹, Alexander R Jafek¹, Bonan Wang²

¹Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA.

|March 26, 2022

Summary

Particle focusing in microfluidic channels is enhanced using viscoelastic fluids, like polyethylene glycol solutions. This study explains particle migration and improves separation resolution through force balance analysis.

Keywords:

inertial focusing particle separation spiral channel viscoelastic flow

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Published on: November 23, 2015

Area of Science:

Fluid dynamics
Non-Newtonian fluid mechanics
Microfluidics

Background:

Viscoelastic fluids exhibit unique properties crucial for particle manipulation.
Microfluidic channels offer controlled environments for studying fluid-particle interactions.
Particle lateral migration in microchannels is influenced by various flow dynamics.

Purpose of the Study:

To investigate particle focusing in viscoelastic flow within microfluidic channels.
To analyze the effects of polyethylene glycol (PEO) concentration on particle behavior.
To understand the interplay of inertial, viscoelastic, and Dean flows on particle migration.

Main Methods:

Experimental study of polystyrene beads (3-20 μm) in aqueous polyethylene glycol solutions.
Observation and analysis of particle migration and focusing positions.
Force balance analysis to predict particle focusing.

Main Results:

Particle focusing position varies with viscoelastic fluid properties and bead size.
Inertial flow, viscoelastic flow, and Dean flow collectively influence particle migration.
Particle focusing position can be accurately predicted using force balance principles.

Conclusions:

Viscoelastic flows significantly impact particle focusing in microfluidic channels.
Understanding force balances allows for prediction of particle behavior.
Viscoelastic flows offer improved particle separation resolution.