Abstract
A model is presented to describe quantitatively particle trajectories and particle impact velocities for a dilute suspension flowing about a cylindrical erosion target. The model embodies the effects of drag, inertia and pressure variation and the contribution to particle retardation caused by the squeeze film on the target surface at impact. Experimental values of free-stream velocity, particle and liquid density, particle size, fluid viscosity, target cylinder diameter and coefficient of restitution are used as input to the program which yields values of impact velocity for any particle, collision efficiency, circumferential erosion angle, impact angle and mean kinetic energy of particle impact. Results predicted by the model are compared with erosion data from a slurry pot erosion tester for the variation of impact velocity, collision efficiency, circumferential erosion angle and erosion rate as a function of particle size, free-stream velocity or liquid viscosity for a variety of experimental conditions. The model predicts the formation of a sliding bed of particles at the specimen surface at lower impact velocities and small particle sizes giving rise to mass loss by abrasion, as opposed to particle impact. The method used may be applied to more complex flow fields providing that they can be accurately defined.
Published Version
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