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Dynamic States Equations of Transport Pipeline in Deep-Sea Mining

Jerzy Sobota Xia Jianxin Evgeniy Kirichenko
Archives of Mining Sciences | 2021 | vol. 66 | No 3 | 385-392 | DOI: 10.24425/ams.2021.138595
Keywords deep-sea mining vertical pipelines stability of deep-sea pipelines
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Abstract

The transport pipeline of lifting the underwater minerals to the surface of the water onto the ship during the movement of the vessel takes in the water a curved deformed shape. Analysis of the state of stability of the pipeline showed that if the flow velocity of fluid in the pipeline exceeds a certain critical value Vkr, then its small random deviations from the equilibrium position may develop into deviations of large amplitude. The cause of instability is the presence of the centrifugal force of the moving fluid mass, which occurs in places of curvature of the axis of the pipeline and seeks to increase this curvature when the ends of the pipeline are fixed. When the critical flow velocity is reached, the internal force factors become unable to compensate for the action of centrifugal force, as a result of that a loss of stability occurs. Equations describing this dynamic state of the pipeline are presented in the article.
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Bibliography

[1] Benjamin T .B. Dynamic of a system of articulated pipes conveying fluid. I Theory. Proc. Royal Soc. 261, 457-486 (1961), II Experiment, 487-99.
[2] Chung J .S., Bao-Rang Cheng, Huttelmaier H .P. Three-Dimensional Coupled Responses of a Vertical Deep-Ocean Pipe: Part II. Excitation at Pipe Top and External Torsion, International Journal of Offshore and Polar Engineering 4, 4, December 1994 (ISSN 1053-5381).
[3] Goman O.G., Kirichenko E.A., Vishnyak E.A. Calculation of hydrodynamic loads on the elements of submersible structures of deep-water slurry pipelines. System Technologies: A collection of scientific papers – Dnipropetrovsk: RVKIA Ukraine 8, 17-23 (1999) [in Russian].
[4] Gregory R .W., Paidoussis M .P. Unstable oscillation of turbular cantilevers, conveying fluid. I Theory. Proc. of the Royal Soc., London, Ser. A, 293, 528-542 (1966).
[5] Handelman H.M. Quart. Appl. Math. 13, 326-334 (1955).
[6] Kirichenko E.A. Possible cases of simplification of the system of equations of oscillations of deep-water slurry pipelines in a flat formulation. Mining, electromechanics and automatics: A collection of scientific papers – Dnipropetrovsk: RVKNGA of Ukraine 4, 137-142 (1999) [in Russian].
[7] Long R.H. Jr. Experimental and theoretical study of transverse vibration of a tube containing flowing fluid. J. App. Mech. 22, 1, 65-68 (1955).
[8] Niordson F .I.N. Vibrations of cylindrical tube containing flowing fluid. Trans. of the Royal Inst. of Tech., Stockholm, Sweden, 1953, No.73. 392
[9] Szelangiewicz T., Żelazny K., Buczkowski R., Computer simulations of deformations and tensions in the pipelines of hydraulic lifting systems, Scientific Journals of the Maritime University of Szczecin – Zeszyty Naukowe Akademii Morskiej w Szczecinie 52 (124), 37-44 (2017). DOI : https://doi.org/10.17402/243
[10] Yao Nijun, Cao Bin, Xia Jianxin, Pressure loss of flexible hose in deep-sea mining system. 18th International Conference on TRANSPORT AND SEDIMENTATION OF SOLID PARTICLES 11-15 September 2017, Prague, Czech Republic. ISBN 978-83-7717-269-8.
[11] Yu Hong-yun, Liu Shao-jun, Dynamics of vertical pipe in deep-ocean mining system, J. Cent. South Univ. Technol. (2007) 04-0552-05. DOI : https://doi.org/10.1007/s11771-007-0106-0
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Authors and Affiliations

Jerzy Sobota
1
ORCID: ORCID
Xia Jianxin
2
ORCID: ORCID
Evgeniy Kirichenko
3
ORCID: ORCID
  1. Wrocław University of E nvironmental and Life Sciences, Poland
  2. Minzu University of China, Beijing, China
  3. Mining University, Dnipropetrovsk, Ukraine

Study on the Three-Phase Flow of the Water Transfer Export Elbow of Natural Gas Hydrate

Wei Chen Hai-liang Xu Bo Wu Fang-qiong Yang
Archives of Mining Sciences | 2022 | vol. 67 | No 2 | 239-258 | DOI: 10.24425/ams.2022.141456
Keywords deep-sea mining natural gas hydrates three-phase flow numerical simulation
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Abstract

The Euler multiphase flow and population equilibrium model were used to simulate the three-phase flow field in the bubble expansion stage of the outlet curved pipe section. The influence of the ratio of the bending diameter and the volume fraction of the gas phase on the pressure loss is revealed, and the safety range of the optimum bending diameter ratio and the volume fraction of the outlet gas phase is determined. The results show that the three-phase flow in the tube is more uniformly distributed in the vertical stage, and when the pipe is curved, the liquid-phase close to the pipe wall gathers along the pipe flank to the outside of the pipe, the solid phase is transferred along the pipe flank to the inside of the pipe, and the gas phase shrinks along the pipe flank to the inner centre. The maximum speed of each phase of the three-phase flow in the elbow is at the wall of the tube from 45° to 60° inside the elbow, and the distribution law along the axial direction of the pipe is about the same as the distribution law of volume fraction. The pressure loss of the elbow decreases with the increase of the bend diameter ratio, when the bend diameter ratio increases to 6, the pressure loss of the pipe decreases sharply, and the pressure loss decreases slowly with the increase of the bend diameter ratio. When the gas phase volume score in the elbow reaches 70%, there will be an obvious wall separation phenomenon, to keep the system in a stable working state and prevent blowout, the gas phase volume score should be controlled within 60%.
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Authors and Affiliations

Wei Chen
1 2 3
ORCID: ORCID
Hai-liang Xu
2 3
ORCID: ORCID
Bo Wu
2 3
ORCID: ORCID
Fang-qiong Yang
2 3
ORCID: ORCID
  1. Hunan University of Humanities, Department of Energy and Electrical Engineering, Science and Technology, Loudi, Hunan 417000, China
  2. Central South University, School of Mechanical and Electrical Engineering, Changsha, Hunan 410083, China
  3. State Key Laboratory of High Performance Complex Manufacturing, Changsha, Hunan 410083, China

EASAC Environmental Steering Panel – what's new in the Panel?

Rajmund Michalski
Nauka | 2023 | No 4 | 151-158 | DOI: 10.24425/nauka.2023.148232
Keywords EASAC environment forest biomass neonicotinoids regenerative agriculture deep sea mining
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Abstract

On 28 March 2023, the first ESP EASAC meeting in 2023 took place in Budapest at the invitation of the Hungarian Academy of Sciences. The broad and interesting range of issues addressed by Environmental Steering Panel should attract more interest also in Poland. Unfortunately, the activity in EASAC is pro publico bono, which is probably the main reason for the low activity of Polish scientists as experts invited to individual projects. Is the organisation referred to in this article credible? The answer is that, at the end of 2018, EASAC was awarded “Think Tank of the Year” by the prestigious Public Affairs Awards Europe. This shows that the activity is appreciated among professionals. I sincerely encourage anyone interested to find out more about what ESP EASAC is doing and to keep checking our activities.
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Authors and Affiliations

Rajmund Michalski
1
  1. Instytut Podstaw Inżynierii Środowiska PAN, Zabrze

International Seabed Authority and Environmental Deep-Sea Stewardship – Principles Governing the Protection and Use of Seabed Resources

Maciej Nyka
Prawo Morskie | 2020 | No XXXIX | 9-20 | DOI: 10.24425/pm.2020.136456
Keywords Deep Sea Stewardship Deep Sea Mining International Seabed Authority Future Generations rights common heritage of mankind
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Abstract

The concept of intergenerational justice is deeply rooted into the regulation of activities in the Area. United Nations Convention on the Law of the Sea on many occasions stresses the need to protect the marine environment in the interest of both contemporary and future generations. One of the institutions with vast competences in this field is the International Seabed Authority. With a perspective on inevitable commercial exploration and exploitation of seabed resources there is a need to answer the question if the Seabed Authority is properly prepared both in the field of law and policy to act as a steward of a mankind? Which instruments has been developed to ensure sustainable use of seabed resources and which of them are at the disposal of the International Seabed Authority? Finally, are the standards of the protection of seabed environment sufficient to satisfy the needs of contemporary consumption without diminishing the ability of the mankind in the future to freely choose their path of development? We can assume that environmental standards which would protect the interest of future people would also secure the sustainability in contemporary use of common heritage at the Seas. International Seabed Authority and international law of the sea can play important role in this process by shaping the future of the mankind with actions undertaken today.
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Authors and Affiliations

Maciej Nyka
1
  1. University of Gdańsk (Poland), Economic Law and Environmental Protection Chair, Faculty of Law and Administration

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