Force generation in confined active fluids: The role of microstructure
arXiv:2205.05619 · doi:10.1103/PhysRevLett.129.058001
Abstract
We experimentally determine the force exerted by a bath of active particles onto a passive probe as a function of its distance to a wall and compare it to the measured averaged density distribution of active particles around the probe. Within the framework of an active stress, we demonstrate that both quantities are - up to a factor - directly related to each other. Our results are in excellent agreement with a minimal numerical model and confirm a general and system-independent relationship between the microstructure of active particles and transmitted forces.
Accepted for the publication in Physical Review Letters, see https://journals.aps.org/prl/accepted/8b078YcbZb419475998267a260895e617cab4a01e
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