ON PARTICLE ADHESION AND REMOVAL MECHANISMS IN TURBULENT FLOWS

Particle removal mechanisms in a turbulent flow am examined and two mo dels which are based on the structure of turbulence near wall flow are described. The theory of critical moment, along with the sliding deta chment models, is used, and the effects of the near-wall coherent vort ices, as well as turbulence burst/inrush phenomena, are included. The down sweep flow patterns are modeled as viscous stagnation point flows . The hydrodynamic force and torque acting on a spherical particle att ached to a wall are used in the model developments. For different adhe sion models, the minimum critical shear velocities for removing partic les of different sizes am evaluated. The model predictions are compare d with the available data and discussed.