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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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