Oscillating microbubbly flows generated by a fluidic oscillator: Flow behavior and mass transfer characteristics

IF 4 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2025-01-27 DOI:10.1002/aic.18736

Longyun Zheng, Ao Qi, Kai Guo, Chunjiang Liu, Xin Wen

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Abstract

In this study, a Coanda-swept fluidic oscillator is used to generate oscillating microbubbly flows. Flow behavior measurements show that the generated microbubbly flows have periodic sweep characteristics. Massive microbubbles are generated by shear-off-induced breakup, dynamic erosion breakup, and wall-fluid-shear-induced breakup within the fluidic oscillator. Mass transfer measurements show that the generated microbubbly flows have a higher interfacial area (a) and volumetric liquid-side mass transfer coefficients (k_L) than the other comparison groups. Furthermore, the energy efficiency is assessed in terms of k_L per energy consumption (η) and energy consumption per a (ξ). For the fluidic oscillator group, the highest k_La is 0.089 s⁻¹, corresponding to (η = 0.63 m³/(kW·s), ξ = 2.6 J/m², a = 785 m²/m³). Although it has been reported that higher k_La is typically associated with lower energy efficiency, the results indicate that the fluidic oscillator is a promising microbubble generator.

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由流体振荡器产生的振荡微气泡流动：流动特性和传质特性

在本研究中，使用coanda - sweep射流振荡器产生振荡微气泡流。流动特性测量表明，生成的微气泡流具有周期性扫掠特性。射流振荡器内剪切破碎、动力侵蚀破碎和壁面-流体剪切破碎均可产生大量微气泡。传质测量结果表明，生成的微气泡流具有更高的界面面积(a)和体积液侧传质系数（kL）。此外，能源效率是根据每能源消耗（η）和每能源消耗（ξ）的kL来评估的。射流振子组最大kLa为0.089 s−1，对应η = 0.63 m3/(kW·s), ξ = 2.6 J/m2, a = 785 m2/m3。虽然有报道称，较高的kLa通常与较低的能量效率相关，但结果表明，流体振荡器是一种有前途的微泡发生器。

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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.