| 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.
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| 发表期刊 | MICROFLUIDICS AND NANOFLUIDICS
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| 2017-06-01
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| 卷号 | 21期号:6 |
| ISSN | 1613-4982
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| 摘要 | We 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. |
| 关键词 | Compound Microdroplets
Structures
Immiscible Droplet Collision
Triple-line
Volume Of Fluid
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| DOI | 10.1007/s10404-017-1944-1
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000404213400009
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| 关键词[WOS] | SURFACE-TENSION
; BINARY COLLISIONS
; LIQUID-DROPS
; COALESCENCE
; WATER
; MICROFLUIDICS
; MICROCHANNELS
; INTERFACES
; SEPARATION
; MECHANISM
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| WOS研究方向 | Science & Technology - Other Topics
; Instruments & Instrumentation
; Physics
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| WOS类目 | Nanoscience & Nanotechnology
; Instruments & Instrumentation
; Physics, Fluids & Plasmas
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| 项目资助者 | National Natural Science Foundation of China(11402274||11272321||11572334)
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| 课题组名称 | LNM微纳米流体力学
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| 论文分区 | 二类
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| 力学所作者排名 | 1
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/60635
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | 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. |
推荐引用方式
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,.
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| 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).
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| 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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