Flow-drag reduction performance of a resident electrolytic microbubble array and its mechanisms

Zhu, Rui; Zhang, Huanbin; Wen, Weiqi; He, Xingyu; Zhao, Chen; Liu, Yu; Zhuang, Qibin; Liu, Zhirrong

doi:10.1016/j.oceaneng.2022.113496

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…The study took advantage of the solubility of carbon dioxide, which can minimize problems with mean velocity measurements and optical access. Zhu [9] proposed a novel self-adaptive microbubble electrolysis control technique for the problem of stable, high-efficiency flow drag reduction for underwater vehicles. The flow drag reduction performance and mechanisms of microbubble arrays were investigated by experimental and numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Influence of the Type of Gas on Drag Reduction by Microbubble Injection

An,

Yang,

Zhang

et al. 2024

Inventions

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In this work, a novel numerical method for studying the influence of gas types on drag reduction by microbubble injection is presented. Aimed at the microbubble drag reduction (MBDR) process for different types of gases, the mass transfer velocity of different types of gases in the gas–liquid phase is defined by writing a user-defined function (UDF), which reflected the influence of gas solubility on the drag reduction rate. An Eulerian multiphase flow model and the Realizable k−ε turbulence model are used for numerical calculation. The population balance model is used to describe the coalescence and breakup phenomena of the microbubble groups. Henry’s theorem is used to calculate the equilibrium concentration of the microbubble mixed flow. The interphase mass transfer rate of the microbubble injection process for different types of gases is studied by using permeation theory. The local mass fraction of the mixed flow is solved by the component transport equation. It is found that the larger the solubility of the gas, the lower the efficiency of MBDR. When the volume flow rate of the same type of gas is the same but the injection speed is different, the larger the solubility of the gas is, the greater the difference in the drag reduction ratio.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Influence of the Type of Gas on Drag Reduction by Microbubble Injection

An,

Yang,

Zhang

et al. 2024

Inventions

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“…This microbubble generation method is widely used in experimental facilities, as in Dominguez-Ontiveros et al [22], Hassan and Gutierrez-Torres [8], and Murai et al [7], among others. A novel article on its use in special groups of electrodes in a micrometric matrix can be found in Zhu et al [23] as an interesting solution to increase its ability to reside in a region in a stable manner. Nevertheless, Wang et al [16] concluded that although considerable progress has been made in understanding bubble injection, a solid knowledge of the physical basis occurring in bubbly flow is still missing.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, where there is still no firm theoretical framework that explains the complexity of the observed mechanisms [23], this article presents a review of the microbubble drag reduction experimental publications during the last decade. First, the methodology used to select the publication data base for this review is shown in Section 2.…”

Section: Introductionmentioning

confidence: 99%

Micro/Bubble Drag Reduction Focused on New Applications

García-Magariño

Lopez-Gavilan

Sor

et al. 2023

JMSE

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Bubble drag reduction has been shown to be a promising technique for reducing the drag in ships, thus reducing the emission of pollutants and allowing the compliance with the new requirements imposed recently in this respect. Different searches have been conducted in the publications related to this technique, and an increase in interest has been shown, especially in the last decade. In this context, a review of the experimental work related to bubble drag reduction published in the last decade is presented in the present article. The works were classified according to the facility used (towing tank, cavitation tunnel, water channel, Taylor–Couette…), and the main finding are presented. It was found that two new trends in research have arisen, while there are still contradictions in the fundamental basis, which needs further study.

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Effect of dolphin-inspired transverse wave microgrooves on drag reduction in turbulence

Zheng,

Liu,

Qin

et al. 2024

Physics of Fluids

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The transverse skin of dolphins exhibits a remarkable drag reduction effect. Although previous studies have identified the drag reduction effect of transverse grooves, no clear guidelines exist regarding the impact of groove parameters on turbulent drag reduction. Hence, this paper suggests a novel numerical study using the Reynolds-averaged Navier–Stokes method to investigate the influence of half-sine wave structure parameters on turbulent drag. The results showed that the aspect ratio of shape parameters significantly affected the drag reduction rate by altering the flow velocity and drag distribution near the wall and increasing the viscous sublayer thickness. Moreover, a novel index friction pressure ratio FPr was introduced to evaluate the drag reduction. It was revealed that the ratio FPr was stable at optimal drag reduction effect regardless of the velocity. By optimizing the FPr, a maximum drag reduction of 29.3% was achieved. These findings provide insight for optimizing transverse groove in drag-reducing surface applications.

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Flow-drag reduction performance of a resident electrolytic microbubble array and its mechanisms

Cited by 3 publications

References 39 publications

Numerical Study of the Influence of the Type of Gas on Drag Reduction by Microbubble Injection

Numerical Study of the Influence of the Type of Gas on Drag Reduction by Microbubble Injection

Micro/Bubble Drag Reduction Focused on New Applications

Effect of dolphin-inspired transverse wave microgrooves on drag reduction in turbulence

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