Pseudo-Laminarization of Micro-Bubble Containing Milky Bubbly Flow in a Pipe

Serizawa, Akimi; Inui, Tomohiko; Yahiro, Toshihiko; Kawara, Zensaku

doi:10.1615/multscientechn.v17.i1-2.50

Cited by 21 publications

(11 citation statements)

References 6 publications

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“…Serizawa et al [25] measured pressure drops of FB mixtures in capillary flows with inner diameters of 6 mm. Ushida et al [26] conducted similar experiments in smaller capillary flows with inner diameters of <1 mm.…”

Section: Discussionmentioning

confidence: 99%

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

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The flow properties of fine bubble mixture flows are investigated and reported. Few previous studies have focused on ultra-fine bubble (UFB) mixtures, which contain sub-micrometer sized bubbles. In this study, UFB mixtures of water and glycerol solution are passed through micro-sized slits and capillaries, and the resultant pressure drops are evaluated in comparison with those for water and aqueous glycerol alone. The experimentally measured pressure drop for slits (≤51 μm) and capillaries (≤81 μm) is less for UFB mixtures than for water and aqueous glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and the UFBs. Furthermore, numerical observation for slip wall conditions is conducted, and the results for UFB mixtures agree with the predicted values for slip wall conditions.

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Section: Discussionmentioning

confidence: 99%

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

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“…Recently, many studies involving microbubbles (average particle diameter less than 100 µm) have attracted attention. For example, microbubbles have been applied to aquaculture and growth promotion in fisheries and agriculture [4][5][6]; they have been used to improve water quality (purification effect) in environmental and civil engineering [7][8][9][10]; and they have been used for cleaning [11][12][13], sterilization [14][15][16], and drag reduction [17][18][19][20][21] in industrial applications. Kodama et al developed a technology to reduce frictional resistance by injecting air bubbles into the wall of a ship [17], but they used millimeter-sized bubbles.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Laminarization of Mixed Microbubble Water and Complex Fluids in Capillary Flows

2021

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Symmetry in fluid flow is determined by external factors such as magnetic or electric fields. Owing to the electrical properties of fluids, liquids containing fine bubble or ionic surfactant molecules differ from the normal fluid flow. Therefore, the pressure drop and frictional coefficient in a pipe are measured and estimated for water alone, for mixed microbubble water (MB), and for complex fluids (anionic surfactant solution and polymer solution) in capillary flow with constant flow rate. For water alone, good agreement is obtained between the experimental and theoretical values for laminar Hagen–Poiseuille flow and the Blasius expression in turbulent flow. For the MB, pseudo-laminarization is suggested up to a Reynolds number of 4.2×103. Both the anionic surfactant solution and the polymer solution exhibit the same tendency as that of the MB. In explaining these behaviors, elasticity and electrical interaction are discussed, and electrical interaction on the capillary wall is strongly suggested to be a contributing factor. Additionally, surface tension is investigated and supports the discussion.

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“…Microbubbles technology that could provide small bubbles with a respective diameter of 10-50 µm has gained enormous attention [25,26]. Microbubbles are characterized by huge interfacial areas, low rising velocity and high inner pressure as compared with macrobubbles [24,25,27], which are widely used in intensifying gas mass transfer into liquid phase [28][29][30]. The combination of ozone and microbubbles would be a promising method to enhance ozone mass transfer and is followed by an increase of degradation efficiency of pollutants.…”

Section: Introductionmentioning

confidence: 99%

A Review on Ultrasonic Catalytic Microbubbles Ozonation Processes: Properties, Hydroxyl Radicals Generation Pathway and Potential in Application

Xiong

Wang

et al. 2018

Catalysts

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Ozone-based advanced oxidant processes (AOPs) have attracted remarkable attention as an alternative and effective approach for mineralization of refractory organics to innocuous substances. Key issues for ozone-based AOPs mainly focused on how to enhance ozone mass transfer and improve the production of hydroxyl radicals. Unfortunately, great efforts have been made, though, the application of ozone-based AOPs still remained in the laboratory scale due to lack of understanding of mechanisms of these hybrid processes. Besides, obtaining the balance of economical-technical feasibility is a great challenge. Ultrasonic catalytic microbubbles ozonation could be considered as a promising method, despite that there are a few studies that addressed this potential technology. Therefore, in this review, summaries about ozone-based microbubbles process, ultrasonic catalytic ozonation process, and ultrasonic catalytic microbubbles ozonation process have been provided in order to give a novel prospective about these hybrid technologies. The main influential parameters, such as initial pH, ozone dosage, intake flow rate, operating temperature, bubble size distributions, ultrasonic frequency, ultrasonic power density, and natural water constituents have also been well discussed. We truly hope that this paper will bring convenience to researchers that are devoted in the field of application of ozone-based AOPs for mineralizing refractory organics in wastewater.

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Pseudo-Laminarization of Micro-Bubble Containing Milky Bubbly Flow in a Pipe

Abstract: Average void fraction α Macro scales Λl, Λg (cm) Open symbols: longitudinal Λl Solid symbols: lateral Λg 0.45

Cited by 21 publications

References 6 publications

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Pseudo-Laminarization of Mixed Microbubble Water and Complex Fluids in Capillary Flows

A Review on Ultrasonic Catalytic Microbubbles Ozonation Processes: Properties, Hydroxyl Radicals Generation Pathway and Potential in Application

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