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LDV measurements of an air-solid two-phase flow in a vertical pipe

Published online by Cambridge University Press:  20 April 2006

Yutaka Tsuji ,
Yoshinobu Morikawa  and
Hiroshi Shiomi
Yutaka Tsuji
Affiliation:
Faculty of Engineering, Osaka University, Osaka, Japan
Yoshinobu Morikawa
Affiliation:
Faculty of Engineering, Osaka University, Osaka, Japan
Hiroshi Shiomi
Affiliation:
Faculty of Engineering, Osaka University, Osaka, Japan
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Abstract

Measurements of air and solid-particle velocities were made in a vertical pipe two-phase flow by the use of a laser-Doppler velocimeter (LDV). Five kinds of plastic particles, diameters of which ranged from about 3 mm to 200 μm, were transported in a vertical pipe of 30 mm inner diameter. It was found that, the smaller the particle size, the flatter was the mean air velocity distribution for the same mass flow ratio of solids to air. Large particles increased air turbulence throughout the pipe section, while small particles reduced it. Both effects of promotion and suppression of turbulence were observed at the same time in the presence of particles of medium size, that is, the turbulence was increased around the pipe centre and reduced near the wall. The frequency spectrum of air turbulence normalized by the turbulence intensity was not changed by the large particles. In the presence of the small particles, the higher-frequency parts of the spectrum increased.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 139 , February 1984 , pp. 417 - 434
Copyright
© 1984 Cambridge University Press

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