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Axial dispersion of suspended sediments in vertical upward pipe flow

机译：垂直向上管道中悬浮沉积物的轴向分散

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摘要

The increasing pressure on earths raw material resources forces the search for alternatives. An alternative source of raw materials is deep sea deposits. The mining of deep sea deposits comes with many challenges, one of them being the vertical transport of excavated material from the seafloor to a floating production platform at the surface. Material can be transported vertically by means of suspending the material in an upward flow of water in a riser. When the riser is fed irregularly by intermittent batches of solids, accumulation of solids can occur that in turn can result in riser blockage. The accumulation process is counteracted by axial dispersion of the batches. In this paper the vertical hydraulic transport of batches is experimentally explored to get insight in the influence of solids on the axial dispersion process. By analysis of the decrease in volume fraction, the axial dispersion coefficient for the vertical transport of batches of sand, gravel and plastic grains relative to the Taylor dispersion coefficient for dissolved matter in turbulent pipe flow is determined. The analysis shows that the presence of solids attenuates axial dispersion such that it plays a minor role in the transport process, particularly for coarse sediments.
机译：对地球原材料资源越来越大的压力迫使人们寻找替代品。另一种原材料来源是深海沉积物。深海沉积物的开采面临许多挑战，其中之一是将挖掘出的物料从海底垂直输送到地面的浮动生产平台。可以通过将物料悬浮在提升管中向上的水流中来垂直运输物料。当隔断的固体不定期地给立管进料时，会发生固体堆积，从而导致立管堵塞。批料的轴向分散抵消了累积过程。本文通过实验探索了批料的垂直水力输送，以了解固体对轴向分散过程的影响。通过分析体积分数的减少，确定了相对于湍流管道中溶解物的泰勒弥散系数而言，垂直输送砂，砾石和塑料颗粒的轴向弥散系数。分析表明，固体的存在会减弱轴向弥散，从而使其在运输过程中起较小作用，尤其是对于较粗的沉积物。

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  • 来源
    《Ocean Engineering》 |2014年第1期|20-30|共11页
  • 作者

    J.M. van Wijk; C. van Rhee; A.M. Talmon;

  • 作者单位

    MTI Holland, Smitweg 6, 2961 AW Kinderdijk, The Netherlands, Delft University of Technology, Faculty of Mechanical, Maritime and Materials Engineering, Section of Dredging Engineering, Mekelweg 6, 2628 CD Delft, The Netherlands;

    Delft University of Technology, Faculty of Mechanical, Maritime and Materials Engineering, Section of Dredging Engineering, Mekelweg 6, 2628 CD Delft, The Netherlands;

    Delft University of Technology, Faculty of Mechanical, Maritime and Materials Engineering, Section of Dredging Engineering, Mekelweg 6, 2628 CD Delft, The Netherlands, Deltares, PO Box 177, 2600 MH Delft, The Netherlands;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Vertical hydraulic transport; Deep sea mining; Axial dispersion; Sediment;

    机译：垂直液压运输;深海采矿;轴向分散沉淀;

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