Double Contact During Drop Impact on a Solid Under Reduced Air Pressure

Handle URI:
http://hdl.handle.net/10754/626261
Title:
Double Contact During Drop Impact on a Solid Under Reduced Air Pressure
Authors:
Li, Erqiang ( 0000-0002-5003-0756 ) ; Langley, Kenneth R.; Tian, Yuan Si; Hicks, Peter D.; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 )
Abstract:
Drops impacting on solid surfaces entrap small bubbles under their centers, owing to the lubrication pressure which builds up in the thin intervening air layer. We use ultrahigh-speed interference imaging, at 5 Mfps, to investigate how this air layer changes when the ambient air pressure is reduced below atmospheric. Both the radius and the thickness of the air disc become smaller with reduced air pressure. Furthermore, we find the radial extent of the air disc bifurcates, when the compressibility parameter exceeds similar to 25. This bifurcation is also imprinted onto some of the impacts, as a double contact. In addition to the central air disc inside the first ring contact, this is immediately followed by a second ring contact, which entraps an outer toroidal strip of air, which contracts into a ring of bubbles. We find this occurs in a regime where Navier slip, due to rarefied gas effects, enhances the rate gas can escape from the path of the droplet.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Li EQ, Langley KR, Tian YS, Hicks PD, Thoroddsen ST (2017) Double Contact During Drop Impact on a Solid Under Reduced Air Pressure. Physical Review Letters 119. Available: http://dx.doi.org/10.1103/PhysRevLett.119.214502.
Publisher:
American Physical Society (APS)
Journal:
Physical Review Letters
KAUST Grant Number:
URF/1/2621-01-01
Issue Date:
20-Nov-2017
DOI:
10.1103/PhysRevLett.119.214502
Type:
Article
ISSN:
0031-9007; 1079-7114
Sponsors:
This study was supported by King Abdullah University of Science and Technology (KAUST) under Grant No. URF/1/2621-01-01. E. Q. L. acknowledges the Thousand Young Talents Program of China, the National Natural Science Foundation of China (Grants No. 11642019, No. 11772327, and No. 11621202) and Fundamental Research Funds for the Central Universities (Grant No. WK2090050041).
Additional Links:
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.214502
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Erqiangen
dc.contributor.authorLangley, Kenneth R.en
dc.contributor.authorTian, Yuan Sien
dc.contributor.authorHicks, Peter D.en
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.date.accessioned2017-11-30T13:07:32Z-
dc.date.available2017-11-30T13:07:32Z-
dc.date.issued2017-11-20en
dc.identifier.citationLi EQ, Langley KR, Tian YS, Hicks PD, Thoroddsen ST (2017) Double Contact During Drop Impact on a Solid Under Reduced Air Pressure. Physical Review Letters 119. Available: http://dx.doi.org/10.1103/PhysRevLett.119.214502.en
dc.identifier.issn0031-9007en
dc.identifier.issn1079-7114en
dc.identifier.doi10.1103/PhysRevLett.119.214502en
dc.identifier.urihttp://hdl.handle.net/10754/626261-
dc.description.abstractDrops impacting on solid surfaces entrap small bubbles under their centers, owing to the lubrication pressure which builds up in the thin intervening air layer. We use ultrahigh-speed interference imaging, at 5 Mfps, to investigate how this air layer changes when the ambient air pressure is reduced below atmospheric. Both the radius and the thickness of the air disc become smaller with reduced air pressure. Furthermore, we find the radial extent of the air disc bifurcates, when the compressibility parameter exceeds similar to 25. This bifurcation is also imprinted onto some of the impacts, as a double contact. In addition to the central air disc inside the first ring contact, this is immediately followed by a second ring contact, which entraps an outer toroidal strip of air, which contracts into a ring of bubbles. We find this occurs in a regime where Navier slip, due to rarefied gas effects, enhances the rate gas can escape from the path of the droplet.en
dc.description.sponsorshipThis study was supported by King Abdullah University of Science and Technology (KAUST) under Grant No. URF/1/2621-01-01. E. Q. L. acknowledges the Thousand Young Talents Program of China, the National Natural Science Foundation of China (Grants No. 11642019, No. 11772327, and No. 11621202) and Fundamental Research Funds for the Central Universities (Grant No. WK2090050041).en
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.214502en
dc.rightsArchived with thanks to Physical Review Lettersen
dc.titleDouble Contact During Drop Impact on a Solid Under Reduced Air Pressureen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalPhysical Review Lettersen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Chinaen
dc.contributor.institutionSchool of Engineering, Fraser Noble Building, King’s College, University of Aberdeen, Aberdeen AB24 3UE, United Kingdomen
kaust.authorLi, Erqiangen
kaust.authorLangley, Kenneth R.en
kaust.authorTian, Yuan Sien
kaust.authorThoroddsen, Sigurdur T.en
kaust.grant.numberURF/1/2621-01-01en
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