Transport mechanisms of turbulence energy in particle-laden channel flow (PIV measurements of interactions between particles and turbulence)

Tomohiko Tanaka, Yohei Sato, Koichi Hishida

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1 Citation (Scopus)

Abstract

The mechanisms of energy transport by solid particles in a turbulent water channel flow were investigated by particle image velocimetry. A filtering technique, which is used in large eddy simulation, was applied to the fluid flow amongst particles to extract a characteristic length scale that governs the energy transfer from particles to fluid turbulence. The turbulence intensity in the streamwise direction, which is identical to the gravity direction, was strongly augmented by particles whose size is slightly greater than the Kolmogorov length scale. The directional scale dependency structure was observed, i.e., large eddies were dissipated in front of particles and particle wake generated eddies, which is emphasized when particles aligned perpendicular to the gravity direction. The subgrid scale turbulence energy is increased until Δ/η≈ 10 (Δ: filter width, η: kolmogorov length scale), which means that particles generate eddies whose size is less than 10 η. The energy backscatter in the presence of particles was observed at Δ/dp≈5 (dp : particle diameter), indicating that particles affect the eddy motion whose size is approximately five times particle diameter.

Original languageEnglish
Pages (from-to)1534-1541
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume71
Issue number706
Publication statusPublished - 2005 Jun

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Particle interactions
Flow measurement
channel flow
Channel flow
particle image velocimetry
Turbulence
turbulence
Gravitation
Large eddy simulation
interactions
Velocity measurement
Energy transfer
energy
Flow of fluids
Particle size
vortices
Fluids
Water
gravitation
large eddy simulation

Keywords

  • Filtering Technique
  • Multiphase Flow
  • PIV
  • SGS Stress
  • Spectral Energy Transfer
  • Turbulence Modification

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "The mechanisms of energy transport by solid particles in a turbulent water channel flow were investigated by particle image velocimetry. A filtering technique, which is used in large eddy simulation, was applied to the fluid flow amongst particles to extract a characteristic length scale that governs the energy transfer from particles to fluid turbulence. The turbulence intensity in the streamwise direction, which is identical to the gravity direction, was strongly augmented by particles whose size is slightly greater than the Kolmogorov length scale. The directional scale dependency structure was observed, i.e., large eddies were dissipated in front of particles and particle wake generated eddies, which is emphasized when particles aligned perpendicular to the gravity direction. The subgrid scale turbulence energy is increased until Δ/η≈ 10 (Δ: filter width, η: kolmogorov length scale), which means that particles generate eddies whose size is less than 10 η. The energy backscatter in the presence of particles was observed at Δ/dp≈5 (dp : particle diameter), indicating that particles affect the eddy motion whose size is approximately five times particle diameter.",
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AU - Sato, Yohei

AU - Hishida, Koichi

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N2 - The mechanisms of energy transport by solid particles in a turbulent water channel flow were investigated by particle image velocimetry. A filtering technique, which is used in large eddy simulation, was applied to the fluid flow amongst particles to extract a characteristic length scale that governs the energy transfer from particles to fluid turbulence. The turbulence intensity in the streamwise direction, which is identical to the gravity direction, was strongly augmented by particles whose size is slightly greater than the Kolmogorov length scale. The directional scale dependency structure was observed, i.e., large eddies were dissipated in front of particles and particle wake generated eddies, which is emphasized when particles aligned perpendicular to the gravity direction. The subgrid scale turbulence energy is increased until Δ/η≈ 10 (Δ: filter width, η: kolmogorov length scale), which means that particles generate eddies whose size is less than 10 η. The energy backscatter in the presence of particles was observed at Δ/dp≈5 (dp : particle diameter), indicating that particles affect the eddy motion whose size is approximately five times particle diameter.

AB - The mechanisms of energy transport by solid particles in a turbulent water channel flow were investigated by particle image velocimetry. A filtering technique, which is used in large eddy simulation, was applied to the fluid flow amongst particles to extract a characteristic length scale that governs the energy transfer from particles to fluid turbulence. The turbulence intensity in the streamwise direction, which is identical to the gravity direction, was strongly augmented by particles whose size is slightly greater than the Kolmogorov length scale. The directional scale dependency structure was observed, i.e., large eddies were dissipated in front of particles and particle wake generated eddies, which is emphasized when particles aligned perpendicular to the gravity direction. The subgrid scale turbulence energy is increased until Δ/η≈ 10 (Δ: filter width, η: kolmogorov length scale), which means that particles generate eddies whose size is less than 10 η. The energy backscatter in the presence of particles was observed at Δ/dp≈5 (dp : particle diameter), indicating that particles affect the eddy motion whose size is approximately five times particle diameter.

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