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Session: Lagrangian aspects of turbulence 1
Session starts: Wednesday 26 August, 10:30
Presentation starts: 11:15
Room: Room F

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Varghese Mathai (Physics of Fluids group, Faculty of Science and Technology, University of Twente)
Vivek Prakash (Prakash Lab, Department of Bioengineering, Stanford University)
Jon Brons (Physics of Fluids group, Faculty of Science and Technology, University of Twente)
Chao Sun (Physics of Fluids group, Faculty of Science and Technology, University of Twente)
Detlef Lohse (Physics of Fluids group, Faculty of Science and Technology, University of Twente)

Abstract:
We report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (Re) is varied from 180 to 300, and the study covers a range of size ratios (4 < D/η < 16) for marginally light spheres. We find that the normalised acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model. We also present preliminary results on the rotational dynamics of large light spheres in turbulence.