Effect of Particle Residence Time on Particle Dispersion in a Plane Mixing Layer

[+] Author and Article Information
Tsuneaki Ishima, Koichi Hishida, Masanobu Maeda

Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama, 223 Japan

J. Fluids Eng 115(4), 751-759 (Dec 01, 1993) (9 pages) doi:10.1115/1.2910208 History: Received February 23, 1992; Revised February 03, 1993; Online May 23, 2008


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 μm 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.

Copyright © 1993 by The American Society of Mechanical Engineers
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