Inertial drag-out problem : sheets and films on a rotating disc

Researchers from the LMFA (Univ. Lyon, Ecole Centrale de Lyon, INSA, CNRS) and LPENSL (Univ. Lyon, ENS de Lyon, CNRS) laboratories identify the physical mechanisms at work in the splashing behavior of a liquid driven by a rotating wheel.

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

T. Barois, P. D. Huck, Ch. Paleo, M. Bourgoin & R. Volk, Probing fluid torque with a hydrodynamical trap : Rotation of chiral particles levitating in a turbulent jet, Physics of Fluids 31, 125116 (2019). Editors Selection and cover of Physics of Fluids.

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.