Transient effects and the role of wetting in microbubble generation

IF 7.9 2区 化学 Q1 CHEMISTRY, PHYSICAL Current Opinion in Colloid & Interface Science Pub Date : 2023-10-01 DOI:10.1016/j.cocis.2023.101722
Pratik D. Desai , William B. Zimmerman
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Abstract

Microbubble dispersions are now commonly deployed in industrial applications ranging from bioprocesses to chemical reaction engineering, at full scale. There are five major classes of microbubble generation devices that are scalable. In recent years, some of these approaches have been explicitly studied for the influence of wetting properties on microbubble performance, for which the major proxy is the bubble-size distribution. In this piece, the methodologies for inferring bubble-size distribution are explored, with several recent advances as well as their potential pitfalls. Subsequently, studies where microbubble generation has been under investigation for wetting effects are assessed and in some cases, those that were not allowed the deduction that wetting is a significant factor. Two particular studies are highlighted: (i) systematic variation of wetting effects within a venturi with removable walls substituted with coated walls of known contact angle with hydrodynamic cavitation induced microbubbles and (ii) variation of ionic liquids with staged fluidic oscillation before steady flow. The first study shows that even in scenarios where high inertial effects would be expected to dominate, wetting influences are significant. The second study shows that transient effects are strongly influenced by both imbibition into pores and surface wetting but that viscous resistance is always a key factor. From the exploration of these recent studies, specific recommendations are made about how to assess the influence of wetting in those mechanisms/devices where it has not been explicitly studied, via deduction from those mechanisms/devices where the effects are demonstrably significant and indeed in some cases, controlling. In study (ii), which is the first to blow micro/bubbles into ionic liquids, wetting and transient effects are reasonable for between 25% and 50% reduction in average bubble size, although up to 70% reduction is observable when viscous effects are dominant, relative to the control of steady flow with the same pressure drop. Indeed, staging transient operations shows both bubble-size reduction and increased volumetric throughput are simultaneously possible.

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瞬态效应及润湿在微泡产生中的作用
微泡分散体现在广泛应用于从生物工艺到化学反应工程的工业应用中。可扩展的微泡产生设备主要有五类。近年来,一些方法明确地研究了润湿特性对微泡性能的影响,其中主要代表是气泡尺寸分布。在这篇文章中,探讨了推断气泡大小分布的方法,以及最近的一些进展及其潜在的缺陷。随后,对微泡产生对润湿影响的研究进行了评估,在某些情况下,那些不允许推演润湿是一个重要因素的研究。本文重点介绍了两个特别的研究:(i)文丘里腔内湿化效应的系统变化,文丘里腔内的可移动壁面被已知接触角的涂覆壁面所取代,并伴有流体动力空化诱导的微泡;(ii)离子液体在稳定流动之前的阶段流体振荡的变化。第一项研究表明,即使在高惯性效应预计占主导地位的情况下,润湿影响也是显著的。第二项研究表明,瞬态效应受孔隙吸胀和表面润湿的强烈影响,但粘滞阻力始终是一个关键因素。从这些最近研究的探索中,提出了关于如何评估润湿在那些尚未明确研究的机制/设备中的影响的具体建议,通过从那些影响明显显著的机制/设备中推断,在某些情况下,确实是控制的。在第一个将微气泡吹入离子液体的研究(ii)中,相对于相同压降的稳定流动控制,湿润和瞬态效应可以使平均气泡尺寸减小25%到50%,尽管在以粘性效应为主的情况下,可以观察到气泡尺寸减小高达70%。事实上,分段瞬态操作表明,气泡尺寸减小和体积吞吐量增加是可能同时实现的。
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来源期刊
CiteScore
16.50
自引率
1.10%
发文量
74
审稿时长
11.3 weeks
期刊介绍: Current Opinion in Colloid and Interface Science (COCIS) is an international journal that focuses on the molecular and nanoscopic aspects of colloidal systems and interfaces in various scientific and technological fields. These include materials science, biologically-relevant systems, energy and environmental technologies, and industrial applications. Unlike primary journals, COCIS primarily serves as a guide for researchers, helping them navigate through the vast landscape of recently published literature. It critically analyzes the state of the art, identifies bottlenecks and unsolved issues, and proposes future developments. Moreover, COCIS emphasizes certain areas and papers that are considered particularly interesting and significant by the Editors and Section Editors. Its goal is to provide valuable insights and updates to the research community in these specialized areas.
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