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538 results on '"Maeda, Masanobu"'

13. Medullary Cardiovascular Center and Acute Brain Swelling

Author

Maeda, Masanobu, Takachi, T., Nakai, M., Krieger, A. J., Sapru, H. N., Ito, Umeo, editor, Baethmann, Alexander, editor, Hossmann, Konstantin-A., editor, Kuroiwa, Toshihiko, editor, Marmarou, Anthony, editor, Reulen, Hans-J., editor, and Takakura, Kintomo, editor

Published
1994
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26. Effect of dispersed phase on modification of turbulent flow in a wall jet

Author

Sato, Yohei, Hishida, Koichi, and Maeda, Masanobu

Subjects
Jets -- Fluid dynamics, Turbulence -- Research, Fluid dynamic measurements -- Analysis, Engineering and manufacturing industries, Science and technology
Abstract

The interaction between dispersed particles and fluid turbulence for a vertical down-flow turbulent wall jet embedded in a uniform stream was investigated experimentally and numerically. Three kinds of size classified spherical particles, which were smaller than the Kolmogorov lengthscale of the flow, were dispersed in the jet upstream of the test section. The particle mass loading ratios were set at up to 0.3. Particle and gas-phase velocities were measured by laser Doppler velocimetry with particle size discrimination, and numerical simulations were carried out considering momentum exchange between both phases. Motion of small particles with Stokes number of around unity was influenced by strong shear in the developing region. Streamwise turbulence intensity was strongly attenuated by the addition of particles in the free shear layer region, while transverse turbulence intensity was suppressed in the fully-developed region of both the free and wall shear regions. Modifications of the mean fluid velocity by the particles induced reduction in the Reynolds stress, which alters the turbulence production. Turbulence modification by particles, with Stokes number of order of unity, is due primarily to the extra dissipation which is a function of particle mean concentration and fluid turbulence in the fully-developed region.

Published
1996

31. Effect of particle residence time on particle dispersion in a plane mixing layer

Author

Ishima, Tsuneaki, Hishida, Koichi, and Maeda, Masanobu

Subjects
Dynamics of a particle -- Research, Turbulence -- Research, Gases -- Research, Engineering and manufacturing industries, Science and technology
Abstract

A particle dispersion has been experimentally investigated in a two-dimensional mixing layer with a large relative velocity between particle and gas-phase in order to clarify the effect of particle residence time on particle dispersion. Spherical glass particles 42, 72, and 135 micrometers in diameter were loaded directly into the origin of the shear layer. Particle number density and the velocities of both particle and gas phase were measured by a laser Doppler velocimeter with modified signal processing for two-phase flow. The results confirmed that the characteristic time scale of the coherent eddy apparently became equivalent to a shorter characteristic time scale due to a less residence time. The particle dispersion coefficients were well correlated to the extended Stokes number defined as the ratio of the particle relaxation time to the substantial eddy characteristic time scale which was evaluated by taking account of the particle residence time.

Published
1993

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