Detachment of rigid-link fibers with linkage contact in a turbulent boundary layer flow

Abstract

Fiber removal with linkage contact in a turbulent boundary layer flow is studied. A rigid-link fiber model which is composed of two ellipsoids and one cylindrical link is considered. It is assumed that the fiber is in contact with the wall by the cylindrical linkage and a spherical end joint. The onset of rolling and sliding detachments is analyzed to determine the condition for removal of fibers from the surface. The hydrodynamic forces and torques acting on the fiber attached to a wall, along with the adhesion forces of contact node and linkage, are used in the model development. For different adhesion models, the minimum critical shear velocities for removing fibers of different sizes, orientations, and thicknesses are evaluated and discussed.

Keywords:

• Fiber
• adhesion
• detachment
• turbulent flow
• resuspension