Turbulence distortion amongst particles in a channel flow by lagrangian measurements

Yohei Sato, Ushio Fukuichi, Koichi Hishida

Research output: Contribution to journalArticle

Abstract

Turbulence distortion by solid particles in a fully-developed channel flow was investigated by Lagrangian measurement technique. Digital particle image velocimetry and a high-speed CCD camera mounted on a shuttle moving with particle mean streamwise velocity were used to simultaneously detect particle and fluid information amongst particles. Two classes of particles at particle volumetric fraction up to 3.32 × 10"' were employed to provide characteristic values of length ratio and distance between particles, i.e., inter-particle spacing. Turbulence augmentation by particles greater than the Kolmogorov micro length scale was induced by the region of the high-strain rate and high vorticity on both sides of particles. The Rapid Distortion Theory applied to dispersed two-phase turbulent flows indicated that the directional non-isotropic structure was observed with an increase in particle volumetric fraction. The enstrophy production was enhanced with decreasing values of inter-particle spacing, yielding an increase in the enstrophy amongst particles.

Original languageEnglish
Pages (from-to)415-422
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume66
Issue number642
DOIs
Publication statusPublished - 2000 Feb

Keywords

  • Directional interaction
  • Inter-particle spacing
  • Lagrangian PIV
  • Multiphase flow
  • RDT
  • Turbulence distortion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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