New model for particle removal from surface in presence of deformed liquid bridge

Liu, Zheyuan; Fu, Jin; Yang, Mingjun; Zhao, Jiafei; Song, Yongchen

doi:10.1016/j.jcis.2019.11.117

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…Therefore, the relative viscosity of the slurry remained unchanged, and the flowability did not significantly change during the initial period of hydrate formation. When the water conversion reached 5.0% (point D), the capillary force caused by the capillary bridge between the pipeline wall and the hydrate started leading to the hydrate to adhere to the inner wall. , The strong interactions among water droplets and hydrate particles resulted in the formation of aggregated fractal hydrate . Notable changes in the flowability within the cell also began to occur.…”

Section: Results and Discussionmentioning

confidence: 99%

Characterization of Hydrate Formation and Flow Influenced by Hydrophilic–Hydrophobic Components within a Fully Visual Rocking Cell

Lang,

Han,

Zou

et al. 2024

Energy Fuels

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The intricate interplay of crude oil composition and additives critically affects hydrate formation and flow behavior, which is significant for flow assurance particularly in deepwater. To investigate, we varied the hydrophilic and hydrophobic properties by proportioning two nonionic surfactants (Span 80 and Tween 80) and conducting hydrate formation experiments in a visual rocking cell. The results show that the increasing hydrophilic−lipophilic balance (HLB) value shifted emulsions from water-in-oil to multiple and oil-in-water phases and significantly affected the hydrate formation among different emulsion types, with a marked increase in the hydrate formation rate in the HLB range of 9 to 11. Slurries maintained flowability due to low hydrate conversion, yet higher HLB (>11) led to slight agglomeration and deposition. In addition, the impacts of water conversion were investigated by multiple pressurization, showing that the hydrate formation amount affected slurry flowability but was primarily dependent on the hydrophilicity and hydrophobicity of the surfactants. When the HLB was below 11, the final water conversion was about 80%, but the formed hydrate still exhibited good dispersion and flowability. In contrast, HLB exceeding 13 resulted in extensive adhesion and deposition on the cell walls. When the water conversion reached about 40%, flowability was completely lost and hydrate blockage occurred.

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Section: Results and Discussionmentioning

confidence: 99%

Characterization of Hydrate Formation and Flow Influenced by Hydrophilic–Hydrophobic Components within a Fully Visual Rocking Cell

Lang,

Han,

Zou

et al. 2024

Energy Fuels

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“…Considering the suppressant application frequency and additional water quantity, the application amount must be su cient to retain dust in wet mineral ore in the natural drying process. The response to the above question re ects the present state-of-the-art nature of granular material science [10].…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel study of iron ore dust emissions from stockpile and train wagons

Fontana,

Silva,

Pontes

et al. 2024

Preprint

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This work presents the development of a research facility to evaluate dust emissions involving wagon and stockpile models, considering operational and environmental variables. Furthermore, the influence of wagon vibration along the railway was considered to match the experimental conditions more closely to reality. The experimental apparatus consisted of a wind tunnel to simulate the wind speed, two lamps with controlled power sources to simulate insolation, a spray nozzle to simulate rain, a turntable to modify the wind direction, a dynamic weighing system, and a particle counter to record particulate emissions during the test. Performance tests of solidifying-type dust suppressants were also conducted. A suppressant application system was incorporated into the wagon and stockpile models. The tests demonstrated that the experimental apparatus could evaluate the performance of dust suppressants and could be used for approval purposes. Tests with vibration revealed interesting effects resulting from material compaction in wagons. Endurance tests demonstrated the apparatus capacity in tests of this nature. Thus, the developed experimental apparatus could be employed as an important tool to develop scientific studies on dust emissions.

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“…The special property of hydrates aroused the interest of investigators around the world, such as the pore size distribution in porous media and the memory effect of hydrate reformation; some research took advantage of these special properties in technology applications, for example, the hydrate-microbubbles and the hydrate cold storage technology. − Safety issues caused by hydrates could cause serious damage to gas pipeline transport; the hydrate slurry flow characteristics and kinetics of hydrate formation were studied in several studies. Particle removal with a liquid bridge from the surface model and a pressure pulse wave attenuation model for flow assurance detection were proposed. − The kinetic formation characteristics of hydrates in porous media and pipelines were studied by several researchers; the results show that hydrate formation in various environments could be quite different. − Therefore, as a potential future energy source, countries such as the United States, Japan, China, Canada, India, and South Korea have conducted corresponding studies on the development and basic physical properties of natural gas hydrate resources. − Test mining has been performed in the NanKai Trough in Japan and the South China Sea, which demonstrated the technical feasibility of mining natural gas hydrates. However, there have been no real precedents of commercial exploitation of natural gas hydrates .…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effect of Porous Media Permeability on the Decomposition Characteristics of Natural Gas Hydrate at the Core Scale

Pang

et al. 2021

Energy Fuels

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As a new type of clean energy, natural gas hydrates are widely distributed in ocean and permafrost. Moreover, it is important to understand the gas production characteristics of gas hydrate resources for the commercial exploitation in the future. The natural gas produced from hydrate bearing sediment is influenced by heat transfer, multiphase flow, and hydrate decomposition phase transition in the reservoir. This paper investigates the impact of permeability on the decomposition characteristics of hydratebearing sediments at laboratory scale by using a validated two-dimensional axisymmetric model. The results showed that in the initial depressurization stage for the low-permeability hydrate core the pressure-lowering end and right boundary exhibit a relatively large pressure difference; as the decomposition advances, the effective thermal conductivity within the reservoir decreases. Subsequently, the Joule−Thomson effect and hydrate decomposition phase change absorb sensible heat in the reservoir, contributing to a further decrease in the center temperature of the core; in areas far from the pressure-lowering end, the hydrate decomposition rate is slower than that in cores with high-permeability hydrates. The hydrate decomposition can lead to an increase in permeability, and hydrate cores with high permeability exhibit faster instantaneous gas production rate than hydrate cores with low permeability, which peak at 12 min. The variation of the effective thermal conductivity has a relatively minimal influence on the gas production characteristics of the hydrate core by depressurization. The gas production of the hydrate core under different conditions exhibits relatively small differences; for the low-permeability hydrate core, hydrate decomposition with thermal injection and the depressurization method exhibits obvious improvement in gas production, and for the higher permeability hydrate core, the acceleration effect is weaker.

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New model for particle removal from surface in presence of deformed liquid bridge

Cited by 12 publications

References 20 publications

Characterization of Hydrate Formation and Flow Influenced by Hydrophilic–Hydrophobic Components within a Fully Visual Rocking Cell

Characterization of Hydrate Formation and Flow Influenced by Hydrophilic–Hydrophobic Components within a Fully Visual Rocking Cell

Wind tunnel study of iron ore dust emissions from stockpile and train wagons

Numerical Simulation of the Effect of Porous Media Permeability on the Decomposition Characteristics of Natural Gas Hydrate at the Core Scale

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