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

Yohei Sato, Ushio Fukuichi, Koichi Hishida

研究成果: Article査読

28 被引用数 (Scopus)


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.

ジャーナルInternational Journal of Heat and Fluid Flow
出版ステータスPublished - 2000 10月

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学
  • 流体および伝熱


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