In this study, particle transport and deposition were studied in a wide tunnel by measuring both the airflow turbulence characteristics and deposition of monodisperse uramine particles of 2.0-4.5 #mu#m diameter on smooth, horizontal surfaces. Turbulence characteristics behind a 2.54 cm high rectangular bar were investigated for free stream velocities ranging from 3.3 m/s to 15.3 m/s. The welldeveloped boundary layer thickness was approximately four times the height of the rectangular bar at a distance of about 55 cm from the bar. Results of the wide tunnel experiments show the complex nature of deposition is turbulent flows due to the interactions between particles and turbulence. In general the particle deposition flux is larger in the near wake region than in the far wake region. The particle deposition flux is roughl yindiependent of the dimensionless particle relaxation time when the relaxation time is less tha none, but increases rapidly as the relaxation time increases above one.
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