Volume 112, Number 5, December 2015
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||23 December 2015|
Experimental detection of superclusters of water droplets in homogeneous isotropic turbulence
1 Turbulence, Mixing and Flow Control Group, Department of Aeronautics, Imperial College London - London, UK
2 Laboratoire des Écoulements Géophysiques et Industriels, CNRS/UJF/G-INP, UMR5519, Université de Grenoble BP53, 38041, Grenoble Cedex 09, France
3 Laboratoire de Physique de l'École Normale Supérieure de Lyon, CNRS & Université de Lyon 46 allée d'Italie, F-69364 Lyon Cedex 07, France
Received: 31 August 2015
Accepted: 4 December 2015
We present a new technique to study preferential concentration of inertial particles in (active) grid generated turbulence. This method, based on the use of a Taylor hypothesis combined to high-speed imaging, allows to reconstruct unprecedentedly long fields of particles and therefore to analyse new large-scale features, not easily resolvable with standard high-speed imaging methods. We first show that the new approach robustly reproduces results on particles clustering previously reported from standard methods. We then extend the analysis to show the first evidence of superclustering (existence of clusters of clusters) of inertial particles in turbulence and present the first characterization of superclusters.
PACS: 47.27.-i – Turbulent flows / 47.55.-t – Multiphase and stratified flows / 47.80.-v – Instrumentation and measurement methods in fluid dynamics
© EPLA, 2015
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