Coagulation and fragmentation dynamics of inertial particles

Details Coagulation and fragmentation dynamics of inertial particles Coagulation and fragmentation dynamics of inertial particles

2009-05-22

arxiv.org/abs/0905.3597v2

Physical Review E 80, 026311 (2009)

Nonlinear Sciences

Chaotic Dynamics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevE.80.026311

Inertial particles suspended in many natural and industrial flows undergo coagulation upon collisions and fragmentation if their size becomes too large or if they experience large shear. Here we study this coagulation-fragmentation process in time-periodic incompressible flows. We find that this process approaches an asymptotic, dynamical steady state where the average number of particles of each size is roughly constant. We compare the steady-state size distributions corresponding to two fragmentation mechanisms and for different flows and find that the steady state is mostly independent of the coagulation process. While collision rates determine the transient behavior, fragmentation determines the steady state. For example, for fragmentation due to shear, flows that have very different local particle concentrations can result in similar particle size distributions if the temporal or spatial variation of shear forces is similar.

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