Chirality in a system of active air-driven spinners
ORAL
Abstract
We present an analysis (based on kinetic theory) of the rich phase behavior and dynamics that we have
observed in experiments with a fluid of disk-shaped rotors. All rotors feature the same chiral geometry.
Contrary to current knowledge, our results show that this chiral fluid displays different flows whose chirality
is not necessarily analogous to the chirality of its constituent particles. We will show that these transitions are
controlled by particle spin and translational velocity correlations and heat dissipation at the boundaries.
Most notably, we will show that particle spin synchronization within the fluid leads to an inversion of the flow chirality, this
inversion resulting from a continuous transition where inverse chiral vortexes appear gradually.
We finally describe a mechanisms through which a set of active particles can control their global rotation state
and hence their transport properties. Our results are relevant for a variety of important biological processes
observed in experiments with a fluid of disk-shaped rotors. All rotors feature the same chiral geometry.
Contrary to current knowledge, our results show that this chiral fluid displays different flows whose chirality
is not necessarily analogous to the chirality of its constituent particles. We will show that these transitions are
controlled by particle spin and translational velocity correlations and heat dissipation at the boundaries.
Most notably, we will show that particle spin synchronization within the fluid leads to an inversion of the flow chirality, this
inversion resulting from a continuous transition where inverse chiral vortexes appear gradually.
We finally describe a mechanisms through which a set of active particles can control their global rotation state
and hence their transport properties. Our results are relevant for a variety of important biological processes
*We acknowledge funding from the Government of Spainthrough project No. FIS2016-76359-P and from the regionalExtremadura Government through projects No. GR18079& IB16087, both partially funded by the ERDF. A.R.-R. ac-knowledge financial support from Conserjería de Transfor-mación Económica, Industria, Conocimiento y Universidadesde la Junta de Andalucia through post-doctoral grant no. DC00316 (PAIDI 2020), co-funded by the EU Fondo Social Eu-ropeo (FSE).
–
Publication: https://arxiv.org/abs/2105.02850
https://arxiv.org/abs/2107.14186
Presenters
-
Miguel Angel Lopez-Castano
- Universidad de Extremadura