dc.contributor.author Yang, Zi Qiang dc.contributor.author Tian, Yuan Si dc.contributor.author Thoroddsen, Sigurður T dc.date.accessioned 2020-04-23T10:45:30Z dc.date.available 2020-04-23T10:45:30Z dc.date.issued 2020-04-15 dc.identifier.uri http://hdl.handle.net/10754/662623 dc.description.abstract Understanding the dynamical transition from capillary-driven to pure inertial focusing is important to revealing the mechanism underlying the most singular micro-jetting produced from drop-impact craters. Herein we study dimple dynamics from the collapse of these craters when the drop is of a different immiscible liquid than the pool. The parameter space is considerably more complex than for identical liquids, revealing intricate compound-dimple shapes. In contrast to the universal capillary-inertial drop pinch-off regime, where the neck radius scales as $R\sim t^{2/3}$, a purely inertial collapse of the air-dimple portrays $R \sim t^{1/2}$ and is sensitive to initial and boundary conditions. Capillary waves can therefore mold the dimple into different collapse shapes. We observe a clear cross-over in the nature of the dynamics from capillary-inertial to purely inertial immediately before the pinch-off. Notably, for singular jetting the cross-over time occurs much earlier, irrespective of the Weber number. dc.publisher arXiv dc.relation.url https://arxiv.org/pdf/2004.07817 dc.rights Archived with thanks to arXiv dc.title Dynamic transition approaching jetting singularity during the collapse of drop-impact craters dc.type Preprint dc.contributor.department Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia. dc.contributor.department Physical Science and Engineering (PSE) Division dc.eprint.version Pre-print dc.identifier.arxivid 2004.07817 kaust.person Yang, Zi Qiang kaust.person Tian, Yuan Si kaust.person Thoroddsen, Sigurður T refterms.dateFOA 2020-04-23T10:46:10Z
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