Accepted Talks Proceedings »

ACCELERATION STATISTICS OF LIGHT PARTICLES IN TURBULENCE

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We report results from the first systematic Lagrangian experimental investigation in the previously unexplored regime of light (air bubbles in water, and rigid hollow spheres) and large particles (D/eta >> 1) in turbulence [1]. Using a traversing camera setup and particle tracking, we study the Lagrangian acceleration statistics of ~3 mm diameter (D) bubbles in a water tunnel with nearly homogeneous and isotropic turbulence generated by an active-grid. The Reynolds number (Re_lambda) is varied from 145 to 230, resulting in size ratios, D/eta in the range of 7.3–12.5, where eta is the Kolmogorov length scale. The experimental results are closely matched by numerical simulations of finite-size bubbles with the Faxén corrections. We also report preliminary results on light rigid spheres in turbulence.

Author(s):

Vivek N. Prakash    
Physics of Fluids Group, University of Twente, The Netherlands
Netherlands

Yoshiyuki Tagawa    
Physics of Fluids Group, University of Twente, The Netherlands
Netherlands

Enrico Calzavarini    
Laboratoire de Mecanique de Lille, Universite Lille, France
France

Julian Martinez Mercado    
Physics of Fluids Group, University of Twente, The Netherlands
Netherlands

Federico Toschi    
Department of Physics, and Department of Mathematics and Computer Science, Eindhoven University of Technology, The Netherlands
Netherlands

Detlef Lohse    
Physics of Fluids Group, University of Twente, The Netherlands
Netherlands

Chao Sun    
Physics of Fluids Group, University of Twente, The Netherlands
Netherlands