article · 02/07/2020
Collective stiffening of soft hair assemblies
Résumé
Many living systems use assemblies of soft and slender structures whose deflections allow them to mechanically probe their immediate environment. In this work, we study the collective response of artificial soft hair assemblies to a shear flow by imaging their deflections. At all hair densities, the deflection is found to be proportional to the local shear stress with a proportionality factor that decreases with density. The measured collective stiffening of hairs is modeled both with a microscopic elastohydrodynamic model that takes into account long range hydrodynamic hair-hair interactions and a phenomenological model that treats the hair assemblies as an effective porous medium. While the microscopic model is in reasonable agreement with the experiments at low hair density, the phenomenological model is found to be predictive across the entire density range.
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Thomazo, J.-B., Lauga, E., Le Révérend, B., Wandersman, E., & Prevost, A. (2020). Collective stiffening of soft hair assemblies. Physical Review E Rapid Communication, 102(1), 010602(R). https://doi.org/10.1103/PhysRevE.102.010602@article{Thomazo2020_318,
author = {Thomazo, Jean-Baptiste and Lauga, Eric and Le Révérend, Benjamin and Wandersman, Elie and Prevost, Alexis},
year = {2020},
month = {7},
title = {Collective stiffening of soft hair assemblies},
journal = {Physical Review E Rapid Communication},
volume = {102},
number = {1},
pages = {010602(R)},
abstract = {Many living systems use assemblies of soft and slender structures whose deflections allow them to mechanically probe their immediate environment. In this work, we study the collective response of artificial soft hair assemblies to a shear flow by imaging their deflections. At all hair densities, the deflection is found to be proportional to the local shear stress with a proportionality factor that decreases with density. The measured collective stiffening of hairs is modeled both with a microscopic elastohydrodynamic model that takes into account long range hydrodynamic hair-hair interactions and a phenomenological model that treats the hair assemblies as an effective porous medium. While the microscopic model is in reasonable agreement with the experiments at low hair density, the phenomenological model is found to be predictive across the entire density range.},
url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.102.010602},
doi = {10.1103/PhysRevE.102.010602},
}TY - JOUR
AU - Thomazo, Jean-Baptiste
AU - Lauga, Eric
AU - Le Révérend, Benjamin
AU - Wandersman, Elie
AU - Prevost, Alexis
PY - 2020
DA - 2020/07/02
TI - Collective stiffening of soft hair assemblies
JO - Physical Review E Rapid Communication
VL - 102
IS - 1
AB - Many living systems use assemblies of soft and slender structures whose deflections allow them to mechanically probe their immediate environment. In this work, we study the collective response of artificial soft hair assemblies to a shear flow by imaging their deflections. At all hair densities, the deflection is found to be proportional to the local shear stress with a proportionality factor that decreases with density. The measured collective stiffening of hairs is modeled both with a microscopic elastohydrodynamic model that takes into account long range hydrodynamic hair-hair interactions and a phenomenological model that treats the hair assemblies as an effective porous medium. While the microscopic model is in reasonable agreement with the experiments at low hair density, the phenomenological model is found to be predictive across the entire density range.
SP - 010602(R)
DO - 10.1103/PhysRevE.102.010602
UR - https://journals.aps.org/pre/abstract/10.1103/PhysRevE.102.010602
ER -