Electrocoalescence of unequal-sized aqueous droplet pair in non-conductive medium

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION Microfluidics and Nanofluidics Pub Date : 2024-09-09 DOI:10.1007/s10404-024-02763-7
Seongsu Cho, Jinkee Lee
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Abstract

Electrocoalescence is a valuable phenomenon for merging droplets and is widely used in various applications such as the demulsification of crude oil, chemical or biological reaction using a small volume and so on. The ‘non-coalescence’ or ‘partial coalescence’ regimes, at which the droplet pair does not completely merge, appear under particular conditions, and researchers figured out these conditions using an equal-sized droplet pair. However, actual applications involve the merging of an unequal-sized droplet pair; the conditions for the non-coalescence or partial coalescence of unequal-sized droplet pair have not been clearly established. In this study, we evaluated the electrocoalescence behavior of a droplet pair with varying the droplet radius ratio, the initial distance between droplets, and the strength of electric fields, and found the conditions when non-coalescence and partial coalescence occur for unequal- and equal-sized droplet pairs. We discovered that unequal-sized droplet pair demonstrates non-coalescence and partial coalescence more frequently than equal-sized pair. Additionally, non-coalescence and partial coalescence occurred for lower strength of electric field as droplet size ratio and initial distance between droplets increased. Finally, we demonstrate that the unequal formation of the cone angle for unequal-sized droplet pair causes different electrocoalescence behaviors compared with equal-sized droplet pair. We anticipate that this study will contribute to the identification of an appropriate electric field range for diverse electrocoalescence applications.

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非导电介质中大小不等的水滴对的电凝聚
电凝聚是一种宝贵的液滴合并现象,被广泛应用于原油破乳、使用小体积进行化学或生物反应等各种领域。在特定条件下会出现 "非凝聚 "或 "部分凝聚 "状态,即液滴对不会完全融合,研究人员利用等大小的液滴对找出了这些条件。然而,在实际应用中,需要合并大小不等的液滴对;而大小不等的液滴对不聚合或部分聚合的条件尚未明确确定。在这项研究中,我们评估了在改变液滴半径比、液滴间初始距离和电场强度时液滴对的电凝聚行为,并发现了不等大和等大液滴对发生不凝聚和部分凝聚的条件。我们发现,大小不等的液滴对比大小相等的液滴对更容易发生不凝聚和部分凝聚。此外,随着液滴尺寸比和液滴间初始距离的增加,在电场强度较低时也会出现不凝聚和部分凝聚现象。最后,我们证明了与等尺寸液滴对相比,不等尺寸液滴对形成的锥角不等会导致不同的电凝聚行为。我们预计这项研究将有助于为各种电凝聚应用确定合适的电场范围。
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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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