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Particle Deposition Mechanisms: Impaction Particle-Surface Interactions When two surfaces are close to each other, the hydrodynamic lubrication effects become important. Consider a disk is moving toward a flat surface with a velocity U as shown in Figure 1.
Figure 1. Schematic of a disk approaching a surface in the presence of a viscous fluid. Using the squeezed film model, the force per unit area needed for moving a disk towards a surface is given by
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