Merged and alternating droplets generation in double T-junction microchannels using symmetrically inserted capillaries

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION Microfluidics and Nanofluidics Pub Date : 2024-04-14 DOI:10.1007/s10404-024-02725-z
Feng Shen, Yuedong Zhang, Chunyou Li, Yan Pang, Zhaomiao Liu
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Abstract

In this work, merged and alternating droplets generated in a microfluidic double T-junction are investigated using experiments and numerical simulations. The double T-junction is constructed by symmetrically inserting two capillaries into a microfluidic chip at specific positions. We explore the effects of the two-phase flow rate fraction, capillary tip distance (30 μm, 60 μm, and 200 μm), and fluid properties on droplet formation phenomena. Detailed observations reveal four distinct regimes during the dynamic evolution of the two-phase interface morphology: merged state, stable alternating droplets, droplet pairs, and jetting. Two phase diagrams are obtained to demonstrate that interfacial tension and dispersed phase viscosity significantly influence these regimes. Moreover, we find that as the flow rate fraction increases from 0.054 to 0.286, the length of generated droplets increases from 156 to 789 μm; we provide a theoretical prediction formula for dimensionless droplet length accordingly. Additionally, our simulations show fluctuating pressure in dispersed flows throughout the process of droplet generation. The simulated pressure in the dispersed flows fluctuates during the droplet generation process. The understanding of the underlying physics of the capillary-based double T-junction contributes valuable insights for various related applications.

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利用对称插入的毛细管在双 T 型交界微通道中生成合并和交替液滴
摘要 在这项工作中,利用实验和数值模拟研究了微流体双 T 型结中产生的合并液滴和交替液滴。双 T 型结是通过在微流控芯片的特定位置对称插入两根毛细管而形成的。我们探讨了两相流速分数、毛细管尖端距离(30 μm、60 μm 和 200 μm)以及流体特性对液滴形成现象的影响。详细的观察结果表明,在两相界面形态的动态演变过程中存在四种不同的状态:合并状态、稳定的交替液滴、液滴对和喷射。获得的两相图表明,界面张力和分散相粘度对这些状态有显著影响。此外,我们发现随着流速分数从 0.054 增加到 0.286,生成液滴的长度从 156 μm 增加到 789 μm;我们相应地提供了无量纲液滴长度的理论预测公式。此外,我们的模拟结果表明,在整个液滴生成过程中,分散流中的压力是波动的。在液滴生成过程中,分散流中的模拟压力会发生波动。研究了两相流率、毛细管尖端距离和流体特性的影响。
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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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