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. 2017 Mar 3;21(3):50. doi: 10.1007/s10404-017-1888-5

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 6 — (Colour online) a 3D streaming-induced drag forces on a particle with a radius of 30 µm ( $|F_{d}|$ , N); b in-plane $|F_{d}|$ ; c out-of-plane $|F_{d}|$ [red arrow in (a)]; and d comparisons of maximum out-of-plane $|F_{d}|$ [peak in (c)] with the buoyancy forces for various particle sizes (radius of $r_{0}$ ). The inset in (c) shows the directions of the plotted forces above a vibrating antinode. $F_{B}$ and $F_{G}$ are the buoyancy and gravity, respectively