Handle URI:
http://hdl.handle.net/10754/293818
Title:
Drop impact splashing and air entrapment
Authors:
Thoraval, Marie-Jean
Abstract:
Drop impact is a canonical problem in fluid mechanics, with numerous applications in industrial as well as natural phenomena. The extremely simple initial configuration of the experiment can produce a very large variety of fast and complex dynamics. Scientific progress was made in parallel with major improvements in imaging and computational technologies. Most recently, high-speed imaging video cameras have opened the exploration of new phenomena occurring at the micro-second scale, and parallel computing allowed realistic direct numerical simulations of drop impacts. We combine these tools to bring a new understanding of two fundamental aspects of drop impacts: splashing and air entrapment. The early dynamics of a drop impacting on a liquid pool at high velocity produces an ejecta sheet, emerging horizontally in the neck between the drop and the pool. We show how the interaction of this thin liquid sheet with the air, the drop or the pool, can produce micro-droplets and bubble rings. Then we detail how the breakup of the air film stretched between the drop and the pool for lower impact velocities can produce a myriad of micro-bubbles.
Advisors:
Thoroddsen, Sigurdur T ( 0000-0001-6997-4311 )
Committee Member:
Chung, Suk Ho; Kasimov, Aslan; Quere, David; Samtaney, Ravi ( 0000-0002-4702-6473 )
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Program:
Mechanical Engineering
Issue Date:
Mar-2013
Type:
Dissertation
Appears in Collections:
Dissertations; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.advisorThoroddsen, Sigurdur Ten
dc.contributor.authorThoraval, Marie-Jeanen
dc.date.accessioned2013-06-11T13:07:50Z-
dc.date.available2013-06-11T13:07:50Z-
dc.date.issued2013-03en
dc.identifier.urihttp://hdl.handle.net/10754/293818en
dc.description.abstractDrop impact is a canonical problem in fluid mechanics, with numerous applications in industrial as well as natural phenomena. The extremely simple initial configuration of the experiment can produce a very large variety of fast and complex dynamics. Scientific progress was made in parallel with major improvements in imaging and computational technologies. Most recently, high-speed imaging video cameras have opened the exploration of new phenomena occurring at the micro-second scale, and parallel computing allowed realistic direct numerical simulations of drop impacts. We combine these tools to bring a new understanding of two fundamental aspects of drop impacts: splashing and air entrapment. The early dynamics of a drop impacting on a liquid pool at high velocity produces an ejecta sheet, emerging horizontally in the neck between the drop and the pool. We show how the interaction of this thin liquid sheet with the air, the drop or the pool, can produce micro-droplets and bubble rings. Then we detail how the breakup of the air film stretched between the drop and the pool for lower impact velocities can produce a myriad of micro-bubbles.en
dc.language.isoenen
dc.subjectDrop Impacten
dc.subjectBubble Entrapmenten
dc.subjectVortex Streeten
dc.subjectGerrisen
dc.subjectSplashingen
dc.subjectFilm Breakupen
dc.subjectejecta sheeten
dc.subjectslingshot mechanismen
dc.subjectbubble ringen
dc.subjectair toroiden
dc.subjectliquid toroiden
dc.subjectVOFen
dc.subjectvortex sheddingen
dc.subjectair entrapmenten
dc.subjectMesler entrainmenten
dc.titleDrop impact splashing and air entrapmenten
dc.typeDissertationen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
thesis.degree.grantorKing Abdullah University of Science and Technologyen_GB
dc.contributor.committeememberChung, Suk Hoen
dc.contributor.committeememberKasimov, Aslanen
dc.contributor.committeememberQuere, Daviden
dc.contributor.committeememberSamtaney, Ravien
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.nameDoctor of Philosophyen
dc.person.id102011en
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