The erosion of a wall due to a particle is computed from the following relation:

(6–106)

as an individual representative particle represents many actual particles. Here is the mass of the particle and is its number rate. The overall erosion of the wall is then the sum over all particles. This gives an erosion rate in kg/s, and an erosion rate density variable in the res file and post-processor in kg/s/m². Note that this erosion rate is only a qualitative guide to erosion, unless precise values for the model constants are known.