Measuring Lagrangian accelerations using an instrumented particle
Mesure de l'accélération Lagrangienne à l'aide de particules instrumentées
Zimmermann, R. ; Fiabane, L. ; Gasteuil, Y. ; Volk, R. ; Pinton, J.F.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA ; IRSTEA RENNES UR TERE FRA ; LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA ; LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA ; LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA
Résumé / Abstract
Accessing and characterizing a flow imposes a number of constraints on the employed measurement techniques; in particular, optical methods require transparent fluids and windows in the vessel. Whereas one can adapt the apparatus, fluid and methods in the laboratory to these constraints, this is hardly possible for industrial mixers. In this paper, we present a novel measurement technique which is suitable for opaque or granular flows: consider an instrumented particle, which continuously transmits the force/acceleration acting on it as it is advected in a flow. Its density is adjustable for a wide range of fluids and because of its small size and its wireless data transmission, the system can be used both in industrial and in scientific mixers, allowing for a better understanding of the flow within. We demonstrate the capabilities and precision of the particle by comparing its transmitted acceleration to alternative measurements, in particular in the case of a turbulent von Kármán flow. Our technique proves to be an efficient and fast tool to characterize flows.
Physica Scripta, vol. T155, 8 p.