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Tunable structures of compound droplets formed by collision of immiscible microdroplets
Chen XD(陈晓东); Sun YN; Xue CD(薛春东); Yu YD; Hu GQ(胡国庆); Hu, GQ (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China.; Hu, GQ (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
Source PublicationMICROFLUIDICS AND NANOFLUIDICS
2017-06-01
Volume21Issue:6
ISSN1613-4982
AbstractWe study the dynamics of a small water droplet colliding with an immiscible large sessile oil droplet in the air. Such a three-phase system forms compound microdroplets with tunable structures, depending on whether the small droplet can penetrate into the large one. A structure of penetrative-engulfing is distinguished from structures which are determined by balancing of the three interfacial tensions among the three phases, i.e., partial-engulfing and complete-engulfing. We develop a three-phase volume-of-fluid method to investigate the collision dynamics numerically, considering the evolution of the triple-line among the three interfaces. Regime maps of the structures for different spreading parameters and heights of the oil droplet are obtained regarding the impact velocity and the viscosity ratio of oil and water. We find that the oil droplet is impenetrable when the viscosity ratio is higher than a critical value. For lower ratio, the structure varies non-monotonically with the impact velocity to cause two transitions. We propose a simple model for the lower transition by incorporating droplet deformation, viscous resistance, and spreading condition. The upper transition boundary is influenced by the spreading of the oil droplet, resulting in an increase in the required penetration length to prevent penetrative-engulfing. Understandings from this work may provide valuable guidelines for generating compound microdroplets with desired structures.
KeywordCompound Microdroplets Structures Immiscible Droplet Collision Triple-line Volume Of Fluid
DOI10.1007/s10404-017-1944-1
Indexed BySCI ; EI
Language英语
WOS IDWOS:000404213400009
WOS KeywordSURFACE-TENSION ; BINARY COLLISIONS ; LIQUID-DROPS ; COALESCENCE ; WATER ; MICROFLUIDICS ; MICROCHANNELS ; INTERFACES ; SEPARATION ; MECHANISM
WOS Research AreaScience & Technology - Other Topics ; Instruments & Instrumentation ; Physics
WOS SubjectNanoscience & Nanotechnology ; Instruments & Instrumentation ; Physics, Fluids & Plasmas
Funding OrganizationNational Natural Science Foundation of China(11402274||11272321||11572334)
DepartmentLNM微纳米流体力学
Classification二类
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60635
Collection非线性力学国家重点实验室
Corresponding AuthorHu, GQ (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China.; Hu, GQ (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Chen XD,Sun YN,Xue CD,et al. Tunable structures of compound droplets formed by collision of immiscible microdroplets[J]. MICROFLUIDICS AND NANOFLUIDICS,2017,21(6).
APA 陈晓东.,Sun YN.,薛春东.,Yu YD.,胡国庆.,...&Hu, GQ .(2017).Tunable structures of compound droplets formed by collision of immiscible microdroplets.MICROFLUIDICS AND NANOFLUIDICS,21(6).
MLA 陈晓东,et al."Tunable structures of compound droplets formed by collision of immiscible microdroplets".MICROFLUIDICS AND NANOFLUIDICS 21.6(2017).
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