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Related Experiment Video

Updated: Dec 25, 2025

Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles

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Published on: March 6, 2016

Inertial focusing in triangular microchannels with various apex angles.

Jeong-Ah Kim¹, Aditya Kommajosula², Yo-Han Choi³

¹Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea.

Biomicrofluidics

|April 2, 2020

Summary

Particle focusing in triangular microchannels shifts with channel angle and flow rate. Acute or obtuse vertices reverse focusing direction, while increasing flow reveals corner focusing modes.

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Published on: July 3, 2018

Area of Science:

Fluid Dynamics
Microfluidics
Particle Manipulation

Background:

Inertial focusing is crucial for particle separation in microfluidic devices.
Triangular channels offer unique flow dynamics due to asymmetric velocity gradients.
Understanding inertial lift forces in non-circular channels is key for optimizing focusing.

Purpose of the Study:

To investigate inertial particle focusing in microchannels with triangular cross sections.
To analyze the effect of varying apex angles and Reynolds numbers on focusing positions.
To elucidate the role of inertial lift forces and channel geometry in particle behavior.

Main Methods:

Fabrication of triangular microchannels with precise apex angles.
Experimental observation of particle focusing behavior under varying conditions.
Computational fluid dynamics simulations to generate force maps and analyze basins of attraction.
Linear stability analysis to identify focusing locations.

Main Results:

Focusing position is significantly affected by the triangular channel's cross-sectional geometry.
The direction of focusing position shift reverses between acute and obtuse triangular vertices.
Corner focusing modes and splitting phenomena emerge at higher Reynolds numbers.
Simulations revealed distinct basins of attraction for different focusing attractors.

Conclusions:

Channel geometry, specifically the apex angle, critically influences inertial focusing.
Reynolds number dictates the emergence of complex focusing behaviors like corner modes.
Computational analysis provides insights into focusing mechanisms difficult to obtain experimentally.
This study enhances understanding of inertial focusing in non-ideal microchannel geometries.