Tunable structures of compound droplets formed by collision of immiscible microdroplets
文献类型：期刊论文
| 作者 | Chen XD(陈晓东) ; Sun YN; Xue CD(薛春东); Yu YD; Hu GQ(胡国庆)
|
| 刊名 | MICROFLUIDICS AND NANOFLUIDICS
 |
| 出版日期 | 2017-06-01 |
| 卷号 | 21期号:6 |
| ISSN号 | 1613-4982 |
| 关键词 | Compound microdroplets Structures Immiscible droplet collision Triple-line Volume of fluid |
| 中文摘要 | 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. |
| 类目[WOS] | Nanoscience & Nanotechnology ; Instruments & Instrumentation ; Physics, Fluids & Plasmas |
| 研究领域[WOS] | Science & Technology - Other Topics ; Instruments & Instrumentation ; Physics |
| 关键词[WOS] | SURFACE-TENSION ; BINARY COLLISIONS ; LIQUID-DROPS ; COALESCENCE ; WATER ; MICROFLUIDICS ; MICROCHANNELS ; INTERFACES ; SEPARATION ; MECHANISM |
| 收录类别 | SCI ; EI |
| 语种 | 英语 |
| WOS记录号 | WOS:000404213400009 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/60635]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 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). |
| APA | 陈晓东,Sun YN,薛春东,Yu YD,&胡国庆.(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). |
入库方式： OAI收割
来源：力学研究所
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