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
Publication statusPublished - 2000 Feb
Externally publishedYes

Fingerprint

channel flow
Channel flow
Turbulence
turbulence
High speed cameras
CCD cameras
Vorticity
Velocity measurement
Turbulent flow
Strain rate
Fluids
vorticity
spacing
high speed cameras
particle image velocimetry
turbulent flow
strain rate

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Turbulence distortion amongst particles in a channel flow by lagrangian measurements. / Sato, Yohei; Fukuichi, Ushio; Hishida, Koichi.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 66, No. 642, 02.2000, p. 415-422.

Research output: Contribution to journalArticle

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