Effects of geometrical confinement on the generation of droplets at microfluidics T-junctions with rectangle channels

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
Kui He, Zhiling Zhang, Liangzhen Zhang, Wuzhi Yuan, Si-Min Huang
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Abstract

Despite the fact that there are not a few relative studies, the effects of geometrical confinement on droplets’ generation at micro-T-junctions are not explicitly addressed. A three-dimensional volume of fluid (VOF) CFD model is developed here to study this classic microfluidics problem. The micro-T-junctions are designed with arms of a same hydraulic diameter but different width-to-depth ratios (\(\chi \) = 1/10–10), covering both deep-style (\(\chi <1)\) and flat-style T-junctions (\(\chi >1)\). It is found that the width-to-depth ratio (confinement style) shows complex effects on the dynamics of droplets’ generation. At \(\chi \le 1/10\), droplets are failed to be generated at the T-junctions. Compared to the normal T-junctions (\(\chi >1\)), the deep-style T-junctions (\(1/6<\chi <\) 1) show much higher generation frequency of droplets at \({\mathrm{Ca}}_{\mathrm{c}}>0.06\) and the volume of generated droplets scales with \({{\mathrm{Ca}}_{\mathrm{c}}}^{-1}\) instead of typical \({{\mathrm{Ca}}_{\mathrm{c}}}^{-0.33}\). The comparative study of two paired T-junctions with reciprocal width-to-depth ratio (e.g., a deep-style T-junction, \(\chi \) = 1/3 and a flat-style T-junction, \(\chi \) = 3) explicitly illustrates that the geometrical confinement stabilizes the generation dynamics of droplets at T-junctions. The mechanism for the stabilization effect is discussed. It provides some new insights in terms of designing devices of droplets’ generation.

Abstract Image

几何约束对矩形通道微流体T形接头液滴产生的影响
尽管有不少相关的研究,但几何约束对微t结液滴产生的影响并没有得到明确的解决。本文建立了三维流体体积(VOF) CFD模型来研究这一经典的微流体问题。微型t型接头的设计臂具有相同的液压直径,但宽深比不同(\(\chi \) = 1/10-10),适用于深型(\(\chi <1)\))和平型(\(\chi >1)\)) t型接头。研究发现,宽深比(约束类型)对液滴生成动力学的影响较为复杂。在\(\chi \le 1/10\)处,t型结处无法形成液滴。与普通t型结(\(\chi >1\))相比,深层t型结(\(1/6<\chi <\) 1)在\({\mathrm{Ca}}_{\mathrm{c}}>0.06\)处的液滴生成频率高得多,生成的液滴体积以\({{\mathrm{Ca}}_{\mathrm{c}}}^{-1}\)而不是典型的\({{\mathrm{Ca}}_{\mathrm{c}}}^{-0.33}\)为尺度。通过对具有互宽深比的两个配对t结(如深型t结\(\chi \) = 1/3和平型t结\(\chi \) = 3)的比较研究,明确地表明几何约束稳定了t结处液滴的生成动力学。讨论了稳定效果的机理。这为液滴产生装置的设计提供了一些新的见解。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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