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

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Oscillatory flow improves hydrodynamic ordering of soft suspensions in rectangular channels.

Paul C Millett¹

¹Department of Mechanical Engineering, University of Arkansas, USA. pmillett@uark.edu.

|June 18, 2025

Summary

Oscillatory flow significantly improves the hydrodynamic ordering of soft particles into trains within channels. This method offers a robust strategy for arranging deformable particles, including biological cells, without complex fluidic devices.

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The Diffusion of Passive Tracers in Laminar Shear Flow

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Published on: May 1, 2018

Area of Science:

Fluid dynamics
Soft matter physics
Computational modeling

Background:

Hydrodynamic ordering is crucial for manipulating soft particles like cells and vesicles.
Existing methods often rely on complex flow-focusing techniques.
Understanding particle behavior in channels under various flow conditions is essential.

Purpose of the Study:

To computationally investigate the hydrodynamic ordering of soft-particle suspensions in rectangular channels.
To compare the effectiveness of steady versus oscillatory flow for particle assembly.
To identify optimal flow parameters for particle train formation.

Main Methods:

Utilized computational simulations to model soft-particle suspensions.
Analyzed particle behavior under both steady and oscillatory flow conditions.
Systematically varied parameters such as Wolmersley number (Wo), capillary number (Ca), and particle volume fraction (ϕ).

Main Results:

Particles self-assemble into one-dimensional trains aligned with the flow direction.
Oscillatory flow enhances particle ordering, especially for multiple side-by-side trains.
Optimal ordering is observed within specific ranges of Wo and Ca, with dependencies noted.
Oscillatory flow proves more robust for ordering polydisperse suspensions.

Conclusions:

Oscillatory flow presents a superior strategy for hydrodynamic ordering of soft particles compared to steady flow.
This approach enables reliable formation of particle trains without specialized flow-focusing channels.
The findings offer a new method for arranging biological cells, vesicles, and droplets.