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Updated: Oct 2, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Nonlinear Phenomena in Microfluidics.

Sarah Battat¹, David A Weitz^1,2,3, George M Whitesides⁴

¹John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

Chemical Reviews

|February 23, 2022

Summary

This summary is machine-generated.

Microfluidic devices exhibit nonlinear phenomena, deviating from proportional flow-pressure relationships. These include oscillations and bifurcations, offering new control possibilities in microscale fluid dynamics.

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Area of Science:

Physics
Fluid Mechanics
Microfluidics

Background:

Microfluidics typically involves laminar, diffusion-limited flows.
Nonlinear phenomena represent a departure from these standard flow regimes.

Purpose of the Study:

To review experimental work on nonlinear phenomena in microfluidics.
To explore the mechanisms and applications of these nonlinear behaviors.

Main Methods:

Analysis of experimental studies on microfluidic nonlinearities.
Investigation of phenomena such as oscillations, bifurcations, and droplet dynamics.
Consideration of geometric and material influences on flow behavior.

Main Results:

Nonlinear phenomena include oscillations, flow-switching, and bifurcations.
Bubble and droplet behavior in microchannels can be nonlinear.
Channel geometry and stimuli-responsive materials induce nonlinearities.
Intermediate Reynolds numbers, non-Newtonian fluids, and liquid metals contribute to nonlinearities.

Conclusions:

Nonlinear phenomena in microfluidics offer distinct behaviors compared to traditional laminar flows.
These phenomena have potential applications in flow control, mixing, and particle separation.