Micro-splashing by drop impacts

Handle URI:
http://hdl.handle.net/10754/562243
Title:
Micro-splashing by drop impacts
Authors:
Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 ) ; Takehara, Kohsei; Etoh, Takeharugoji
Abstract:
We use ultra-high-speed video imaging to observe directly the earliest onset of prompt splashing when a drop impacts onto a smooth solid surface. We capture the start of the ejecta sheet travelling along the solid substrate and show how it breaks up immediately upon emergence from the underneath the drop. The resulting micro-droplets are much smaller and faster than previously reported and may have gone unobserved owing to their very small size and rapid ejection velocities, which approach 100 m s-1, for typical impact conditions of large rain drops. We propose a phenomenological mechanism which predicts the velocity and size distribution of the resulting microdroplets. We also observe azimuthal undulations which may help promote the earliest breakup of the ejecta. This instability occurs in the cusp in the free surface where the drop surface meets the radially ejected liquid sheet. © 2012 Cambridge University Press.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; High-Speed Fluids Imaging Laboratory
Publisher:
Cambridge University Press (CUP)
Journal:
Journal of Fluid Mechanics
Issue Date:
18-Jul-2012
DOI:
10.1017/jfm.2012.281
Type:
Article
ISSN:
00221120
Sponsors:
S.T.T. was partially supported by KAUST GCR AEA Grant 70000000028 (Fine-Resolution Printing).
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.contributor.authorTakehara, Kohseien
dc.contributor.authorEtoh, Takeharugojien
dc.date.accessioned2015-08-03T09:57:45Zen
dc.date.available2015-08-03T09:57:45Zen
dc.date.issued2012-07-18en
dc.identifier.issn00221120en
dc.identifier.doi10.1017/jfm.2012.281en
dc.identifier.urihttp://hdl.handle.net/10754/562243en
dc.description.abstractWe use ultra-high-speed video imaging to observe directly the earliest onset of prompt splashing when a drop impacts onto a smooth solid surface. We capture the start of the ejecta sheet travelling along the solid substrate and show how it breaks up immediately upon emergence from the underneath the drop. The resulting micro-droplets are much smaller and faster than previously reported and may have gone unobserved owing to their very small size and rapid ejection velocities, which approach 100 m s-1, for typical impact conditions of large rain drops. We propose a phenomenological mechanism which predicts the velocity and size distribution of the resulting microdroplets. We also observe azimuthal undulations which may help promote the earliest breakup of the ejecta. This instability occurs in the cusp in the free surface where the drop surface meets the radially ejected liquid sheet. © 2012 Cambridge University Press.en
dc.description.sponsorshipS.T.T. was partially supported by KAUST GCR AEA Grant 70000000028 (Fine-Resolution Printing).en
dc.publisherCambridge University Press (CUP)en
dc.subjectaerosols/atomizationen
dc.subjectbreakup/coalescenceen
dc.subjectdropsen
dc.titleMicro-splashing by drop impactsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratoryen
dc.identifier.journalJournal of Fluid Mechanicsen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Kinki University, Higashi-Osaka 577-8502, Japanen
kaust.authorThoroddsen, Sigurdur T.en
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