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Computational Models for Polydisperse Particulate and Multiphase Systems by Daniele L. Marchisio, Rodney O. Fox

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5.7  First-order point processes

First-order point processes group together all the discontinuous processes involving a single particle. Because only one particle takes part in the discontinuous event, the rate can be assumed to be proportional to the NDF. A common example is particle breakage: when a particle (solid, droplet or bubble) undergoes some sort of stress it can be broken into fragments. In this case positive and negative source terms must be included, since one particle will disappear, while other particles (fragments) will simultaneously enter the phase space. Another example is particle deposition on walls and boundaries, wherein only the negative source terms are present (Bensaid et al., 2009, 2010). Here, we will write the source ...

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