Solute dispersion in pre-turbulent confined active nematics
arXiv:2410.04629 · doi:10.1039/D4SM01175A
Abstract
We investigate the dispersion of solutes in active nematic fluids confined in narrow channels based on simulations of nematohydrodynamics. The study focuses on two pre-turbulent regimes: oscillatory flow, with net mass flux, and dancing flow, without net flux. Our findings reveal that the longitudinal dispersion of solutes, in both regimes, is determined by the second moments of the longitudinal and transverse components of the velocity field and proportional to the activity, suggesting a common mechanism for dispersion in these distinct flows. Finally, we found that the dispersion coefficient may increase up to one order of magnitude with respect to molecular diffusion in the dancing flow regime and that it is also enhanced in oscillatory flows, with potential for applications in natural biological environments and engineered devices.
References in corpus (14)
- Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
- Spontaneous flow transition in active polar gels
- Steady-state hydrodynamic instabilities of active liquid crystals: Hybrid lattice Boltzmann simulations
- Directed collective motion of bacteria under channel confinement
- Diffusion and spatial correlations in suspensions of swimming particles
- Onset of meso-scale turbulence in living fluids
- Stirring by squirmers
- Correlation lengths in hydrodynamic models of active nematics
- Confinement controlled bend instability of three-dimensional active fluids
- Activity induced nematic order in isotropic liquid crystals
- Self-mixing in microtubule-kinesin active fluid from nonuniform to uniform distribution of activity
- Active nematic-isotropic interfaces in channels
- Dispersion of activity at an active-passive nematic interface
- Hydrodynamic diffusion in apolar active suspensions