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Robust boundary flow in chiral active fluid
- Source :
- Phys. Rev. E 101, 022603 (2020)
- Publication Year :
- 2019
-
Abstract
- We perform experiments on an active chiral fluid system of self-spinning rotors in confining boundary. Along the boundary, actively rotating rotors collectively drives a unidirectional material flow. We systematically vary rotor density and boundary shape; boundary flow robustly emerges under all conditions. Flow strength initially increases then decreases with rotor density (quantified by area fraction $\phi$); peak strength appears around a density $\phi=0.65$. Boundary curvature plays an important role: flow near a concave boundary is stronger than that near a flat or convex boundary in the same confinements. Our experimental results in all cases can be reproduced by a continuum theory with single free fitting parameter, which describes the frictional property of the boundary. Our results support the idea that boundary flow in active chiral fluid is topologically protected; such robust flow can be used to develop materials with novel functions.<br />Comment: 14 pages, 5 figures
- Subjects :
- Condensed Matter - Soft Condensed Matter
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. E 101, 022603 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1910.14341
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevE.101.022603