An experimental study of the evaporation dynamics for an inkjet-printed drop on a solid substrate has been attempted. Using fluorescent spherical colloids, the internal flow of an evaporating drop has been observed directly. During the initial stages of the process, a novel inward radial flow carries the particles as a single group towards the center of the drop. Once the particles have converged near the center, a significantly slower outward radial flow proceeds. These flow regimes are qualitatively analyzed and their relationship to a possible thermal Marangoni flow is discussed.
An Examination of Flow Regimes Associated With Inkjet-Printed Colloidal Drops
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Bromberg, V, Gawande, S, Sun, Y, & Singler, T. "An Examination of Flow Regimes Associated With Inkjet-Printed Colloidal Drops." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 6: Electronics and Photonics. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 17-24. ASME. https://doi.org/10.1115/IMECE2008-68877
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