Print Email Facebook Twitter Reverse movement and coalescence of water microdroplets in electrohydrodynamic atomization Title Reverse movement and coalescence of water microdroplets in electrohydrodynamic atomization Author Agostinho, L.L.F. Fuchs, E.C. Metz, S.J. Yurteri, C.U. Marijnissen, J.C.M. Faculty Applied Sciences Department BT/Biotechnology Date 2011-08-15 Abstract When a high voltage is applied to a liquid pumped through a needle, charged microdroplets can be formed, which are carried along the electric field lines. This phenomenon is called electrohydrodynamic atomization (EHDA), or simply electrospray. In this work we show that in the case of water, droplets may reverse their paths flying back toward the liquid meniscus, sometimes making contact with it. Such reverse movement is caused by polarization of the water inside the strong electric field. To understand this phenomenon we developed a way to calculate the droplet charge using its trajectory obtained by high-speed imaging. The values found showed that these droplets are charged between 2.5% and 19% of their Rayleigh limit. To reference this document use: http://resolver.tudelft.nl/uuid:5cb0c3d9-93e0-4ab7-9ac3-1c0f76c1400d DOI https://doi.org/10.1103/PhysRevE.84.026317 Publisher American Physical Society ISSN 1539-3755 Source http://link.aps.org/doi/10.1103/PhysRevE.84.026317 Source Physical Review E, 84 (2), 2011 Part of collection Institutional Repository Document type journal article Rights © 2011 The Author(s)American Physical Society Files PDF Marijnissen_2011.pdf 1.07 MB Close viewer /islandora/object/uuid:5cb0c3d9-93e0-4ab7-9ac3-1c0f76c1400d/datastream/OBJ/view