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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

DISPERSION OF SMALL HEAVY PARTICLES IN A UNIFORMLY SHEARED TURBULENCE

Mitsuru Tanaka
Dept. of Mechanical and System Eng., Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606, Japan

Tsuyoshi Miyagawa
Murata Manufacturing Co. Lt. Tenjin, Nagaokakyo-shi, Kyoto 617-8555, Japan

Yasushi Maeda
Department of Mechanical and System Engineering, Kyoto Institute of Technology Sakyo-ku, Kyoto-shi, Kyoto 606-8585, Japan

Yoshimichi Hagiwara
Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Abstract

We have carried out direct numerical simulations for the motions of small heavy particles in a uniformly sheared turbulence. The effects of the inertia and the drift velocity of particles on their dispersion are examined systematically by changing these two parameters independently. It is found in the limit of zero particle inertia that the particle dispersion both in the stream-wise and vertical directions becomes most active for the particles with some finite drift velocity. It is also found that the displacement of falling particles is asymmetric with respect to their mean displacement.