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07 February 2025
 
  » arxiv » 1109.0188

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Lagrangian statistics of light particles in turbulence
Julian Martinez Mercado ; Vivek N. Prakash ; Yoshiyuki Tagawa ; Chao Sun ; Detlef Lohse ;
Date 1 Sep 2011
AbstractWe study the Lagrangian velocity and acceleration statistics of light particles (micro-bubbles in water) in homogeneous isotropic turbulence. Micro-bubbles with a diameter of 340 microns and Stokes number from 0.02 to 0.09 are dispersed in a turbulent water tunnel operated at Taylor-Reynolds numbers (Re) ranging from 160 to 265. We reconstruct the bubble trajectories by employing three-dimensional particle tracking velocimetry (PTV). It is found that the probability density functions (PDFs) of the micro-bubble acceleration show non-Gaussian behavior with flatness values of around 23-30, and they do not show a dependence on Re. These acceleration PDFs show a higher intermittency compared to neutrally buoyant (Qureshi et al., Phys. Rev. Lett., 2007) and heavy particles (Ayyalasomayajula et al., Phys. Rev. Lett., 2006) in wind tunnel experiments. In addition, the micro-bubble acceleration autocorrelation function decorrelates slower with increasing Re. We also compare our results with experiments in von Karman flows and point-particle direct numerical simulations with periodic boundary conditions.
Source arXiv, 1109.0188
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