Probing fluid torque with a hydrodynamical trap: Rotation of chiral particles levitating in a turbulent jet

Thomas Barois (1) , Peter D Huck (2) , Charles Paleo (2) , Mickaël Bourgoin (2) , Romain Volk (2)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 Phys-ENS - Laboratoire de Physique de l'ENS Lyon

A vertical turbulent jet is used to trap chiral particles. The particles are maintained in levitation and a stationary rotation regime is observed. The model particles used are composed of a sphere and a helical tail. The rotating performance of the particles is investigated as a function of the length and the twisting of their tails. In addition, the flow field around a spherical particle trapped in the jet is characterized by a particle tracking velocimetry technique (3D-PTV). This flow characterization is used to compute the near-field velocity around a captured particle and to predict the rotation reported for the different geometries tested.

Domaines: Mécanique des fluides [physics.class-ph]

Thomas Barois, Peter D Huck, Charles Paleo, Mickaël Bourgoin, Romain Volk. Probing fluid torque with a hydrodynamical trap: Rotation of chiral particles levitating in a turbulent jet. Physics of Fluids, 2019, 31 (12), pp.125116. ⟨10.1063/1.5131207⟩. ⟨hal-02427609⟩