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Related Experiment Video

Updated: Dec 26, 2025

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

Robust boundary flow in chiral active fluid.

Xiang Yang^1,2, Chenyang Ren¹, Kangjun Cheng³

¹School of Physics and Astronomy and Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China.

Physical Review. E

|March 15, 2020

Summary

This summary is machine-generated.

Active chiral fluids with self-spinning rotors create robust, unidirectional boundary flow. This flow

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Area of Science:

Physics
Soft Matter Physics
Fluid Dynamics

Background:

Active matter systems exhibit complex behaviors driven by internal energy conversion.
Chiral active fluids, with components having inherent handedness, display unique collective dynamics.
Confining boundaries significantly influence the emergent properties of active matter.

Purpose of the Study:

To investigate the emergence and characteristics of boundary-induced material flow in an active chiral fluid system.
To explore the effects of rotor density and boundary geometry on the stability and strength of the boundary flow.
To validate experimental findings with a theoretical continuum model.

Main Methods:

Experimental realization of an active chiral fluid using self-spinning rotors within a confining boundary.
Systematic variation of rotor density (area fraction, ϕ) and boundary shapes (flat, convex, concave).
Quantitative measurement of the unidirectional material flow along the boundary and comparison with a continuum theory.

Main Results:

A robust, unidirectional boundary flow consistently emerged across all tested conditions.
Flow strength exhibited a non-monotonic dependence on rotor density, peaking around ϕ=0.65.
Boundary curvature significantly impacted flow strength, with concave boundaries yielding stronger flows.

Conclusions:

The boundary flow in this active chiral fluid system is topologically protected and robust.
The observed phenomena can be accurately modeled by a continuum theory, highlighting the role of boundary friction.
This study opens avenues for developing novel functional materials leveraging controlled boundary flows.