Splitting behavior and breakup mechanism of bubbles in the split‐and‐recombine microchannel

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2024-07-06 DOI:10.1002/aic.18526

Weiyang Chen, Xinyu Tian, Hengkuan Zhang, Yaran Yin, Xianming Zhang, Chunying Zhu, Taotao Fu, Youguang Ma

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Abstract

Split‐and‐recombine (SAR) microreactor is an advanced reactor for chemical process intensification. Bubble flow in the SAR microchannel is an important phenomenon that affects reaction efficiency, however drew little attention before. This study aims to explore the underlying mechanisms of bubble splitting, retraction, and breakup behaviors in a compact SAR microchannel. Two breakup flow patterns, unilateral flow and unilateral alternate flow were identified with symmetric or asymmetric splitting, respectively. Mechanism analysis indicates that the splitting symmetry issue is related to liquid slug size, viscous effect and novel retraction behavior of a splitting filament. The retraction is induced by the interconnection and unequal pressures between the splitting filaments. The correlation between normalized breakup time and Ca number confirms the Capillary‐pressure breakup mechanism for the splitting gas filaments. Two empirical correlations for the two breakup flow patterns were proposed, which illustrate the significant contribution of bubble retraction to the breakup degree.

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微通道中气泡的分裂行为和破裂机理

分流重组（SAR）微反应器是一种先进的化学过程强化反应器。SAR 微通道中的气泡流动是影响反应效率的一个重要现象，但以前很少引起人们的注意。本研究旨在探索紧凑型 SAR 微通道中气泡分裂、缩回和破裂行为的内在机理。研究发现，单侧流动和单侧交替流动两种破裂流动模式分别具有对称或不对称分裂。机理分析表明，分裂对称性问题与液滴大小、粘性效应和分裂丝的新型回缩行为有关。回缩是由分裂丝之间的相互连接和不平等压力引起的。归一化断裂时间与 Ca 数之间的相关性证实了分裂气体丝的毛细管压力断裂机制。提出了两种破裂流动模式的经验相关性，说明了气泡回缩对破裂程度的重要影响。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.