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Fig. 9.

image

Mean vertical relative velocity between particle pairs in units of m s−1, as a functionof vertical separation. The Kn ~ 1 data is shown in the top panel and the Kn < 1 data in the bottom panel. The different curves refer to increasingly large values in δr. The aggregation dynamics is the same at all radial (horizontal) separations, suggesting the formation of a particle layer.

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