Experimental Study on Void Fractions and Pressure Drops in Three-Phase Flow for Deep Sea Mining

Takano, Satoru; Masanobu, Sotaro; Kanada, Shigeo; Ono, M.

doi:10.1115/omae2021-60472

Cited by 3 publications

(2 citation statements)

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“…We collected four experimental datasets for a vertical pipe: one obtained in this study and three from previous studies (Takano et al, 2020(Takano et al, , 2021(Takano et al, , 2022. The experimental datasets for the twophase flow are listed in Table 1.…”

Section: Experimental Datamentioning

confidence: 99%

Preface: Multiphase Flows

Sugiyama,

Hayashi

2023

MultScienTechn

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Multiphase Science and Technology (MST) publishes novel research work covering all aspects of multiphase systems. The scope of MST encompasses theoretical concepts, physical modeling, experimental techniques, and numerical simulations. Main research areas include but are not limited to mechanics of interfaces, internal flows, external flows, multiphase flow modeling, measuring techniques, micro-and nano-fluidics, and multiphase bio-systems.MST accepts the following manuscripts for publication: Short communications, which should not exceed 4 pages starting with a brief abstract. These communications should not contain section headings and should be accompanied by a statement of justification for the reason for rapid publication in the form of a covering letter to the Editor. Full-length papers of original, high-quality research:The format of the full papers should start with a brief abstract followed by an introduction section; followed by sections containing results and discussion, conclusions, references, and appendices if necessary. Highlights and Reviews: "Highlight" papers give authors the opportunity to highlight the importance of a new topic of particular interest to the community by discussing its importance, challenges that it faces, and identify future research opportunities. Authors could also use this opportunity to highlight growing/emerging areas in multiphase science. These papers should not contain new research and should not exceed 6 pages in MST format; these articles are normally published via invitation by the Editorial Board. Review papers are normally published via invitation by the Editorial Board and should correspond to critical reviews and/or tutorial papers on a broad subject. Position Papers: These are papers on 'hot' research themes of topical interest. These papers may be invited by the Editorial Board or unsolicited, have a similar format to that of the Letter/Brief communications (see above) and should not exceed 4 pages in length. The author(s) of these papers have an opportunity to communicate their personal opinion (which could be speculative and controversial) on a particular topic, and/or comment on a recent paper in MST; in the latter case, the authors of the relevant paper will be given the opportunity to respond to these comments in the same issue. Special Issues: There may be scope to dedicate an entire issue to the publication of several, full-length papers on a given topic of particular interest to the community. The publication of these issues follows a detailed statement of justification for the dedication of an entire MST issue for one topic. Photo and Video Gallery: A gallery photos and videos of multiphase flow experiments or simulations, selected from research published in MST, will be published on the MST website once a year.

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Section: Experimental Datamentioning

confidence: 99%

Preface: Multiphase Flows

Sugiyama,

Hayashi

2023

MultScienTechn

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“…However, this is not correct, because the density difference of air along the flow passage cannot be neglected under long-distance transport, e.g., deep-sea mining. Takano et al 25 reviewed previous studies for two-and three-phase flows, including slip flow models and drift flux models of the void fraction, homogeneous models, and separated flow models of frictional pressure drop. They proposed methods for estimating the void fraction and frictional pressure drop in three-phase flow that involve fewer constants and are applicable to a wider range of conditions than existing correlations.…”

Section: Introductionmentioning

confidence: 99%

Gas state equation and flow mechanism of gas–liquid two-phase flow in airlift pump system

Du,

Zhu,

Han

et al. 2024

Physics of Fluids

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Airlift pumps (ALPs) have a simple structure and significant application potential. However, previous studies on ALPs have generally assumed that the gas density remains constant. In this paper, the gas state equation (GSE) for ALP is established based on the van der Waals formula, which explicitly considers the density of gas. An electrical resistance tomography system is used to collect the gas void fractions at different heights under different gas flow rates, and an empirical formula for the gas void fraction is established. To verify the effectiveness of the proposed model, high-precision pressure sensors and a high-speed camera are used alongside an electrical resistance tomography system to determine the realistic ALP flow parameters. The results of 409 sets of experiments show that: (1) the gas in ALP cannot be regarded as ideal gas, because the ideal GSE cannot distinguish between different gas flow rates; (2) the state change of gas in ALP is a quasi-equilibrium process, whereby the GSE of ALP can be obtained from the pressures under several locations; (3) the axial pressures predicted by the proposed GSE for ALP are in good agreement with experimental data; and (4) a single parameter of the GSE uniquely determines the state process. The proposed model and the experimental data provide a new methodology and comprehensive references for studying the working mechanism and efficiency of ALPs.

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Subsea Mineral Resources and Flow Assurance for Air-lift Pumping Systems

Takano

Masanobu²

2022

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Subsea minerals, such as seafloor massive sulfides, rare earth elements in deep-sea mud, are found in deep sea within the exclusive economic zone of Japan. However, the development of subsea resources has not reached the commercialization stage because many technical issues still need to be addressed. Then, efforts for solving these issues are conducted in Japan and other countries. Air-lift pumping systems are one of the promising methods for subsea mineral resource productions. In developing air-lift pumping systems, one of the technical issues is flow assurance for gas-liquid-solid three-phase flow. We reviewed the correlations of volume fractions and frictional pressure drops in gas-liquid and liquid-solid two-phase flows and proposed correlations for three-phase flows. We carried out some experiments of air-lift pumping systems and obtained data of volume fractions of each phase and frictional pressure drops. To validate the proposed correlation, we compared calculated results by the proposed correlations with experimental data. The comparison suggested that the volume fraction of gas-phase and the frictional pressure drops could be calculated by the proposed correlations. Meanwhile, deviations between experimental data of solid-phase and calculated results of that was large and new methods were needed for calculated them.

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Experimental Study on Void Fractions and Pressure Drops in Three-Phase Flow for Deep Sea Mining

Cited by 3 publications

References 0 publications

Preface: Multiphase Flows

Preface: Multiphase Flows

Gas state equation and flow mechanism of gas–liquid two-phase flow in airlift pump system

Subsea Mineral Resources and Flow Assurance for Air-lift Pumping Systems

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