Mass transfer of gas–liquid two-phase flow in asymmetric parallel microchannels with liquid feed splitting

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2024-07-09 DOI:10.1002/aic.18527

Zien Huang, Xingyu Xiang, Bin Jiang, Chunying Zhu, Xianbao Cui, Youguang Ma, Taotao Fu

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Abstract

Due to size limitations, the gas–liquid absorption capacity of a single microchannel is limited, making it difficult to achieve large-scale CO₂ capture. Therefore, the parallel microchannels combining the advantages of high efficiency and large throughput stand out. However, when the operating condition is high gas–liquid flow rate ratio, the liquid phase between bubbles almost disappears after multiple distributions, which affects the amount of gas–liquid absorption. In this study, the numbering-up of the asymmetric parallel microchannels in the gas–liquid absorption process was investigated by splitting the liquid feed stream in two. The flow patterns under different operating conditions were obtained. The flow and distribution of gas–liquid two-phase flow were investigated, and the reason of the distribution deterioration caused by appearance of long slug bubbles was explained by the pressure drop distribution. The total liquid mass transfer coefficient and bubble residence time were derived and obtained, and the mass transfer was further discussed.

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非对称平行微通道中气液两相流的传质与液体进料分流

由于尺寸限制，单个微通道的气液吸收能力有限，难以实现大规模的二氧化碳捕集。因此，兼具高效率和大吞吐量优点的并联微通道脱颖而出。然而，当工作条件为高气液流速比时，气泡之间的液相在多次分布后几乎消失，从而影响气液吸收量。本研究通过将液体料流一分为二，研究了气液吸收过程中不对称平行微通道的编号问题。获得了不同操作条件下的流动模式。研究了气液两相流的流动和分布，并从压降分布的角度解释了长条状蛞蝓气泡出现导致分布恶化的原因。推导并获得了总液体传质系数和气泡停留时间，并进一步讨论了传质问题。

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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.