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<p>In this paper, mechanical behaviors of a marine riser considering air–water–solid three-phase internal flow in air-lift pump for seabed mining are investigated numerically. First, the average mass and velocity changes of the air–water–solid three-phase mixture according to the water depth generated in airlift pump are considered. Comparing with the three-phase flow in air-lift pump and single-phase flow in conventional deepwater drilling riser, the mass and velocity of the single-phase internal fluid does not be changed according to water depth but in the case of three-phase flow changes. Thus, it is needed to consider this effect in strength design of the riser under the three-phase internal flow in air-lift pump. Second, considering ocean waves, ocean currents and the three-phase internal flow, the government equation of the riser is established based on the Newton’s second law and then this analysis model is numerically solved by the Newmark-<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40868_2024_162_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\upbeta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">β</mi> </math></EquationSource> </InlineEquation> method. Finally, the effects of the three-phase internal flow and some system parameters on the mechanical behaviors of the riser are investigated and discussed.</p>

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Mechanical behavior analysis of a marine riser considering mass and velocity changes of three-phase internal mixture in air-lift pump for seabed mining

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Chung-Jin Om,
  • Gwang-Hyok Choe,
  • Un-Ryong Rim

摘要

In this paper, mechanical behaviors of a marine riser considering air–water–solid three-phase internal flow in air-lift pump for seabed mining are investigated numerically. First, the average mass and velocity changes of the air–water–solid three-phase mixture according to the water depth generated in airlift pump are considered. Comparing with the three-phase flow in air-lift pump and single-phase flow in conventional deepwater drilling riser, the mass and velocity of the single-phase internal fluid does not be changed according to water depth but in the case of three-phase flow changes. Thus, it is needed to consider this effect in strength design of the riser under the three-phase internal flow in air-lift pump. Second, considering ocean waves, ocean currents and the three-phase internal flow, the government equation of the riser is established based on the Newton’s second law and then this analysis model is numerically solved by the Newmark- \(\upbeta \) β method. Finally, the effects of the three-phase internal flow and some system parameters on the mechanical behaviors of the riser are investigated and discussed.