In the heart of a micro-mixer: characterisation of liquid-liquid flow hydrodynamics inside an advanced-flow micro-reactor

IF 2.9 4区工程技术 Q2 INSTRUMENTS & INSTRUMENTATION

Microfluidics and Nanofluidics Pub Date : 2025-10-09 DOI:10.1007/s10404-025-02842-3

Filip Horvath-Gerber, Surya Narayan, Konstantin S. Pervunin, Lyes Kahouadji, Christian Holtze, Eleonore J. C. Deublein, Omar K. Matar, Christos N. Markides, Klaus Hellgardt

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Abstract

The hydrodynamic characteristics of liquid-liquid flows in a micro-mixing plate with a ‘heart/spade’ geometry and a hydraulic diameter of \(\sim\) 0.36 mm at the contraction point are studied experimentally in the Reynolds number range of \(250 - 1,000\). Localised optical observations of the two-phase flow within the micro-mixing device units are performed using a high-speed camera in combination with an LED-induced fluorescence imaging technique. A qualitative interpretation of the instantaneous images enabled the development of a regime map with three stable flow patterns, each with a metastable transitional state. The formation of secondary flows and recirculation zones resulted in the breakup of interfaces and fragmentation of droplets. The droplet size distribution of an MTBE-water dispersion is studied across a broad range of the dispersed phase (water) ratios, \(\phi _{\textrm{d}} = 0.091 - 0.714\). The resulting Sauter mean diameter of water droplets is used to evaluate the improvement in the specific surface area and was correlated as a function of the energy dissipation rate and the Reynolds and Weber numbers.

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在微混合器的中心：先进流动微反应器内液-液流动的流体力学特征

在雷诺数\(250 - 1,000\)范围内，实验研究了收缩点水力直径为\(\sim\) 0.36 mm的“心/铲”型微混合板中液-液流动的水动力特性。使用高速摄像机结合led诱导荧光成像技术对微混合装置单元内的两相流进行局部光学观察。对瞬时图像的定性解释能够开发出具有三种稳定流动模式的状态图，每一种都具有亚稳态过渡状态。二次流和再循环区的形成导致了界面的破裂和液滴的破碎。在广泛的分散相（水）比范围内研究了mtbe -水分散体的液滴尺寸分布，\(\phi _{\textrm{d}} = 0.091 - 0.714\)。由此得到的水滴的Sauter平均直径用于评估比表面积的改善，并将其作为能量耗散率和雷诺兹数和韦伯数的函数进行关联。

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来源期刊

Microfluidics and Nanofluidics 工程技术-纳米科技

CiteScore

4.80

自引率

3.60%

发文量

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.).