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. 2020 Dec 10;10:21616. doi: 10.1038/s41598-020-77836-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Capillary-based axisymetric designs of droplet generators. (a) and (b) jetting and dripping of a co-flow, respectively²⁰; (c) and (d) jetting and dripping of a co-flow-focusing in an embedded geometry, respectively²²; (e) co-flow-focusing in a non-embedded geometry, enforcing the jetting regime²⁵, also referred to as tip-streaming; (f) Raydrop: co-flow-focusing in a non-embedded geometry, enforcing the dripping regime. All solid black lines represent capillary walls.