Particle-laden turbulent flow with transverse magnetic field in a vertical channel

Yohei Sato, Kishizawa Hiroshi, Koichi Hishida, Maeda Masanobu

研究成果: Conference contribution

抄録

Turbulence modification by dispersed particles in a vertical, fully-developed channel flow was investigated by loading soft magnetic particles and locally applying a magnetic field to the flow, so that the significant transverse particle motion was observed. The attracted particles to a hot wall were detached from it after losing their magnetism at the excess temperature over particle Curie point. The application of magnetic force realized the capability to control the local particle concentration of particles in the channel and their velocities. The experimental results showed that the suppression of turbulence intensities in the core region was observed at a mass loading ratio of 0.18 and turbulence was much attenuated near the wall at 0.7. For accurate modelling the turbulence modification in particle-laden flows, it has been necessary to understand important parameters dominating the modification level. Parameterization performed in the present investigation showed that the ratio of particle diameter to a characteristic length scale of turbulence classified whether turbulence was damped or enhanced. Turbulence attenuation or augmentation levels in dilute two-phase flows were correlated with the particle Reynolds number based on mean relative velocities and the ratio of total particle velocity variance to total turbulence intensity, which will be dominant parameters in modelling a source or sink term of turbulence kinetic energy.

元の言語English
ホスト出版物のタイトルAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
出版者Publ by ASME
ページ93-100
ページ数8
180
ISBN(印刷物)0791813630
出版物ステータスPublished - 1994
イベントProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18) - Lake Tahoe, NV, USA
継続期間: 1994 6 191994 6 23

Other

OtherProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18)
Lake Tahoe, NV, USA
期間94/6/1994/6/23

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Turbulent flow
Turbulence
Magnetic fields
Magnetism
Channel flow
Parameterization
Two phase flow
Kinetic energy
Reynolds number

ASJC Scopus subject areas

  • Engineering(all)

これを引用

Sato, Y., Hiroshi, K., Hishida, K., & Masanobu, M. (1994). Particle-laden turbulent flow with transverse magnetic field in a vertical channel. : American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED (巻 180, pp. 93-100). Publ by ASME.

Particle-laden turbulent flow with transverse magnetic field in a vertical channel. / Sato, Yohei; Hiroshi, Kishizawa; Hishida, Koichi; Masanobu, Maeda.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 巻 180 Publ by ASME, 1994. p. 93-100.

研究成果: Conference contribution

Sato, Y, Hiroshi, K, Hishida, K & Masanobu, M 1994, Particle-laden turbulent flow with transverse magnetic field in a vertical channel. : American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 巻. 180, Publ by ASME, pp. 93-100, Proceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18), Lake Tahoe, NV, USA, 94/6/19.
Sato Y, Hiroshi K, Hishida K, Masanobu M. Particle-laden turbulent flow with transverse magnetic field in a vertical channel. : American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 巻 180. Publ by ASME. 1994. p. 93-100
Sato, Yohei ; Hiroshi, Kishizawa ; Hishida, Koichi ; Masanobu, Maeda. / Particle-laden turbulent flow with transverse magnetic field in a vertical channel. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. 巻 180 Publ by ASME, 1994. pp. 93-100
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N2 - Turbulence modification by dispersed particles in a vertical, fully-developed channel flow was investigated by loading soft magnetic particles and locally applying a magnetic field to the flow, so that the significant transverse particle motion was observed. The attracted particles to a hot wall were detached from it after losing their magnetism at the excess temperature over particle Curie point. The application of magnetic force realized the capability to control the local particle concentration of particles in the channel and their velocities. The experimental results showed that the suppression of turbulence intensities in the core region was observed at a mass loading ratio of 0.18 and turbulence was much attenuated near the wall at 0.7. For accurate modelling the turbulence modification in particle-laden flows, it has been necessary to understand important parameters dominating the modification level. Parameterization performed in the present investigation showed that the ratio of particle diameter to a characteristic length scale of turbulence classified whether turbulence was damped or enhanced. Turbulence attenuation or augmentation levels in dilute two-phase flows were correlated with the particle Reynolds number based on mean relative velocities and the ratio of total particle velocity variance to total turbulence intensity, which will be dominant parameters in modelling a source or sink term of turbulence kinetic energy.

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