Effect of inter-particle spacing on turbulence modulation by Lagrangian PIV

Yohei Sato, Ushio Fukuichi, Koichi Hishida

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Turbulence modulation by solid particles in a fully developed channel flow was investigated by Lagrangian measurement technique. Digital particle image velocimetry (DPIV) 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 among particles. Two classes of particles at particle volumetric fraction up to 3.32 x 10-4 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 a region of high strain rate and high vorticity located on both sides of the particles. The rapid distortion theory (RDT) applied to dispersed two-phase turbulent flows substantiates the observed directional non-isotropic structure 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 among particles. (C) 2000 Begell House Inc. Published by Elsevier Science Inc. All rights reserved.

Original languageEnglish
Pages (from-to)554-561
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume21
Issue number5
DOIs
Publication statusPublished - 2000 Oct

Fingerprint

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

Keywords

  • Directional interaction
  • Dispersed two-phase flows
  • Inter-particle spacing
  • Lagrangian PIV
  • RDT
  • Turbulence distortion

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Effect of inter-particle spacing on turbulence modulation by Lagrangian PIV. / Sato, Yohei; Fukuichi, Ushio; Hishida, Koichi.

In: International Journal of Heat and Fluid Flow, Vol. 21, No. 5, 10.2000, p. 554-561.

Research output: Contribution to journalArticle

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