Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model

Yohei Sato, Hiroaki Hayakawa, Koichi Hishida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The interaction between dispersed particles and fluid turbulence for circular confined jets was investigated numerically by a multiple-time-scale particle-laden turbulence model. Two kinds of size classified spherical particles, which were smaller than or greater than the Kolmogorov lengthscale of the flow, were dispersed in the inner tube upstream of the test section. The present modeling divides the energy-containing part of the spectrum into two regions and considers the energy transfer from large turbulent motion to small scales by particles. Numerical simulations were performed by the two-way coupling simulations between the Eulerian k-ε model and the particle Lagrangian simulation. Turbulence attenuation in air was observed in the presence of particles smaller than the Kolmogorov lengthscale of the flow, which can be also predicted by the present multiple-time-scale model. The transfer rate of turbulence energy was reduced by the particle drag, therefore the turbulence energy was attenuated. Particles which were several times the Kolmogorov lengthscale augmented turbulence intensity of water. The particle concentration fluctuations increased the turbulence energy in production range, which induced enhancing the energy transfer rate from production range to transfer range and yielded an increase in the dissipation rate of turbulence kinetic energy. These results are consistent with prior studies in channel flow and wall jet by Sato (1996). The present study ensures the ability of the multiple-time-scale model in which several time scales are required to characterize turbulence modification by particles.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
PublisherASME
Volume17
Publication statusPublished - 1997
EventProceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 24 (of 24) - Vancouver, Can
Duration: 1997 Jun 221997 Jun 26

Other

OtherProceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 24 (of 24)
CityVancouver, Can
Period97/6/2297/6/26

Fingerprint

Turbulence
Computer simulation
Energy transfer
Channel flow
Turbulence models
Kinetic energy
Drag
Fluids
Air
Water

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Sato, Y., Hayakawa, H., & Hishida, K. (1997). Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED (Vol. 17). ASME.

Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model. / Sato, Yohei; Hayakawa, Hiroaki; Hishida, Koichi.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 17 ASME, 1997.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sato, Y, Hayakawa, H & Hishida, K 1997, Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model. in American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. vol. 17, ASME, Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 24 (of 24), Vancouver, Can, 97/6/22.
Sato Y, Hayakawa H, Hishida K. Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 17. ASME. 1997
Sato, Yohei ; Hayakawa, Hiroaki ; Hishida, Koichi. / Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 17 ASME, 1997.
@inproceedings{611370ec7cb64261b72bbb3918051663,
title = "Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model",
abstract = "The interaction between dispersed particles and fluid turbulence for circular confined jets was investigated numerically by a multiple-time-scale particle-laden turbulence model. Two kinds of size classified spherical particles, which were smaller than or greater than the Kolmogorov lengthscale of the flow, were dispersed in the inner tube upstream of the test section. The present modeling divides the energy-containing part of the spectrum into two regions and considers the energy transfer from large turbulent motion to small scales by particles. Numerical simulations were performed by the two-way coupling simulations between the Eulerian k-ε model and the particle Lagrangian simulation. Turbulence attenuation in air was observed in the presence of particles smaller than the Kolmogorov lengthscale of the flow, which can be also predicted by the present multiple-time-scale model. The transfer rate of turbulence energy was reduced by the particle drag, therefore the turbulence energy was attenuated. Particles which were several times the Kolmogorov lengthscale augmented turbulence intensity of water. The particle concentration fluctuations increased the turbulence energy in production range, which induced enhancing the energy transfer rate from production range to transfer range and yielded an increase in the dissipation rate of turbulence kinetic energy. These results are consistent with prior studies in channel flow and wall jet by Sato (1996). The present study ensures the ability of the multiple-time-scale model in which several time scales are required to characterize turbulence modification by particles.",
author = "Yohei Sato and Hiroaki Hayakawa and Koichi Hishida",
year = "1997",
language = "English",
volume = "17",
booktitle = "American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED",
publisher = "ASME",

}

TY - GEN

T1 - Turbulence modification in particle-laden confined jets -numerical simulation by multiple-scale k-ε model

AU - Sato, Yohei

AU - Hayakawa, Hiroaki

AU - Hishida, Koichi

PY - 1997

Y1 - 1997

N2 - The interaction between dispersed particles and fluid turbulence for circular confined jets was investigated numerically by a multiple-time-scale particle-laden turbulence model. Two kinds of size classified spherical particles, which were smaller than or greater than the Kolmogorov lengthscale of the flow, were dispersed in the inner tube upstream of the test section. The present modeling divides the energy-containing part of the spectrum into two regions and considers the energy transfer from large turbulent motion to small scales by particles. Numerical simulations were performed by the two-way coupling simulations between the Eulerian k-ε model and the particle Lagrangian simulation. Turbulence attenuation in air was observed in the presence of particles smaller than the Kolmogorov lengthscale of the flow, which can be also predicted by the present multiple-time-scale model. The transfer rate of turbulence energy was reduced by the particle drag, therefore the turbulence energy was attenuated. Particles which were several times the Kolmogorov lengthscale augmented turbulence intensity of water. The particle concentration fluctuations increased the turbulence energy in production range, which induced enhancing the energy transfer rate from production range to transfer range and yielded an increase in the dissipation rate of turbulence kinetic energy. These results are consistent with prior studies in channel flow and wall jet by Sato (1996). The present study ensures the ability of the multiple-time-scale model in which several time scales are required to characterize turbulence modification by particles.

AB - The interaction between dispersed particles and fluid turbulence for circular confined jets was investigated numerically by a multiple-time-scale particle-laden turbulence model. Two kinds of size classified spherical particles, which were smaller than or greater than the Kolmogorov lengthscale of the flow, were dispersed in the inner tube upstream of the test section. The present modeling divides the energy-containing part of the spectrum into two regions and considers the energy transfer from large turbulent motion to small scales by particles. Numerical simulations were performed by the two-way coupling simulations between the Eulerian k-ε model and the particle Lagrangian simulation. Turbulence attenuation in air was observed in the presence of particles smaller than the Kolmogorov lengthscale of the flow, which can be also predicted by the present multiple-time-scale model. The transfer rate of turbulence energy was reduced by the particle drag, therefore the turbulence energy was attenuated. Particles which were several times the Kolmogorov lengthscale augmented turbulence intensity of water. The particle concentration fluctuations increased the turbulence energy in production range, which induced enhancing the energy transfer rate from production range to transfer range and yielded an increase in the dissipation rate of turbulence kinetic energy. These results are consistent with prior studies in channel flow and wall jet by Sato (1996). The present study ensures the ability of the multiple-time-scale model in which several time scales are required to characterize turbulence modification by particles.

UR - http://www.scopus.com/inward/record.url?scp=0030702417&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030702417&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0030702417

VL - 17

BT - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED

PB - ASME

ER -