Particle removal from rough surfaces Academic Article uri icon

abstract

  • Particle resuspension from surfaces in turbulent flow became in recent years the object of many theoretical and experimental studies. In general, available experimental data do not support the existing theoretical models. The main objective of the present work is to analyze the role of roughness in resuspension. We show that particle detachment from rough surfaces may be caused by the hydrodynamic moment determined by shear viscous sublayer with additional effects of turbulent structures. A particle in contact with one, two, or three surface asperities is considered. We show that a one-asperity contact is similar to the contact of a particle with a smooth surface, but the detaching moment is reduced both by the reduced adhesion force and by the reduced contact radius. For a particle in contact with two asperities there exist two main possibilities of detachment by rotation, namely, along the …

publication date

  • January 1, 1996