Preferred sizes and ordering in surface nanobubble populations

Details Preferred sizes and ordering in surface nanobubble populations Preferred sizes and ordering in surface nanobubble populations

2009-06-02

arxiv.org/abs/0906.0486v1

Phys Rev E 80, 036315 (2009)

Physics

Fluid Dynamics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevE.80.036315

Two types of homogeneous surface nanobubble populations, created by different means, are analyzed statistically on both their sizes and spatial positions. In the first type (created by droplet-deposition, case A) the bubble size R is found to be distributed according to a generalized gamma law with a preferred radius R*=20 nm. The radial distribution function shows a preferred spacing at ~5.5 R*. These characteristics do not show up in comparable Monte-Carlo simulations of random packings of hard disks with the same size distribution and the same density, suggesting a structuring effect in the nanobubble formation process. The nanobubble size distribution of the second population type (created by ethanol-water exchange, case B) is a mixture of two clearly separated distributions, hence, with two preferred radii. The local ordering is less significant, due to the looser packing of the nanobubbles.

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