2010/02/02 by Luca Giomi, M. Cristina Marchetti, Tanniemola B. Liverpool · 4 citations
Engineering · Materials Science · Physics and Astronomy · #Lattice Boltzmann Simulation Studies #Micro and Nano Robotics #Pickering emulsions and particle stabilization #cond-mat.soft
paper · pdf · doi:10.1103/physreve.81.051908
published as Phys. Rev. E 81, 051908 (2010) · 10 pages, 10 figures
arxiv created 2010/02/02 · openalex publication_date 2010/05/06 · arxiv updated 2010/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We analyze the behavior of a suspension of active polar particles under shear. In the absence of external forces, orientationally ordered active particles are known to exhibit a transition to a state of nonuniform polarization and spontaneous flow. Such a transition results from the interplay between elastic stresses, due to the liquid crystallinity of the suspension, and internal active stresses. In the presence of an external shear, we find an extremely rich variety of phenomena, including an effective reduction (increase) in the apparent viscosity depending on the nature of the active stresses and the flow-alignment property of the particles, as well as more exotic behaviors such as a nonmonotonic stress-strain-rate relation and yield stress for large activities.