Diffusion-limited cluster aggregation restructuring

In summary, the typical final restructured value A 2.0-2.2 for laboratory results may be compared with a value Df l.2 for simulations [72, 113], In this model, diffusion-limited cluster-cluster aggregates restructured in discrete steps to A 2.2, after which further increase was not possible. The situation in the atmosphere is more complex, and there probably exists a spectrum of A values in the range 1.8 to 2.0-2.2, dependent mainly on aggregate age and meteorological conditions encountered. 

Clusters generated by 3-d polydisperse model for diffusion-limited cluster-ciuster aggregation. The ciuster in (a) was obtained without restructuring, while those in (b), (c), and (d) were generated in simulations allowing one, two, or three stages of rotational restructuring, respectively, Fractal dimensions of the clusters are 1.80 (a), 2.09 (b), 2.17 (c), and 2.18 (d). From Meakin and Jullien [39]. 

Meakin, P. and Jullien, R. (1988). The effects of restructuring on the geometry of clusters formed by diffusion-limited, ballistic and reaction-limited cluster-cluster aggregation. J. Chem. Phys., 89, 246-250. 

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