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Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models

机译：粗壁人工骨折模型中非线性流动和微流体场的实验研究

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摘要

The understanding of nonlinear flow in rough-walled rock fractures is critical for underground engineering and geological sciences. The macroscopic behavior and microfluidic field of flow in rough-walled artificial fracture models was investigated through microscopic visualization of hydraulic experiment. The results indicate that there are three states of flow regime in fracture, namely linear, weak inertial and strong inertial. In linear flow regime, the relationship between pressure drops and flow rate is linear, and all the streamlines in the microfluidic field are parallel. In weak inertial flow regime, pressure drop and flow become nonlinear, and the inertial pressure loss is less than the viscous pressure loss. Moreover, backflow occurs near the tortuous wall in the microfluidic field. In strong inertial flow regime, the inertial pressure loss is greater than viscous pressure loss, and the backflow begins to detach from the wall and eventually develop into a significantly large eddy far away from the wall. However, the flow in the mainstream remains laminar rather than turbulent in this experiment. This result indicates that the main cause of the nonlinearity of flow in fracture is eddies due to the increase of the inertia term and the variation of aperture. The shrinking of effective channel and losing of kinetic energy caused by eddies make fluid flow nonlinear. Moreover, the area and number of eddies depend on the fracture roughness and the Reynolds number.
机译：对粗糙壁岩石骨折中非线性流动的理解对于地下工程和地质科学至关重要。通过液压实验微观可视化研究了粗壁人造裂缝模型中宏观行为和微流体领域。结果表明，裂缝中有三种流动制度，即线性，弱惯性和强惯性。在线性流动状态下，压降和流速之间的关系是线性的，并且微流体场中的所有流线都是平行的。在弱的惯性流动状态下，压降和流量变为非线性，并且惯性压力损失小于粘性压力损失。而且，回流发生在微流体场中的曲折墙附近。在强的惯性流动状态下，惯性压力损失大于粘性压力损失，并且回流开始从墙壁上分离并最终发展成远离墙壁的显着大的涡流。然而，在该实验中，主流的流量仍然是层状而不是湍流。该结果表明，由于惯性术语的增加和孔的变化，骨折流动非线性的主要原因是漩涡。埃德迪引起的有效通道和失去动能的萎缩使流体流动非线性。此外，面积和漩涡的数量取决于骨折粗糙度和雷诺数。

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  • 来源
    《Advances in Water Resources》 |2020年第8期|103637.1-103637.11|共11页
  • 作者

    Guo Pingye; Wang Meng; He Manchao; Wang Yanwei; Gao Kai; Gong Weili;

  • 作者单位

    State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China|China Univ Min & Technol Sch Mech Architecture & Civil Engn Beijing 100083 Peoples R China;

    State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China|China Univ Min & Technol Sch Mech Architecture & Civil Engn Beijing 100083 Peoples R China;

    State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China|China Univ Min & Technol Sch Mech Architecture & Civil Engn Beijing 100083 Peoples R China;

    China Inst Water Resources & Hydropower Res Beijing 100038 Peoples R China;

    State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China|China Univ Min & Technol Sch Mech Architecture & Civil Engn Beijing 100083 Peoples R China;

    State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China|China Univ Min & Technol Sch Mech Architecture & Civil Engn Beijing 100083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nonlinear flow; Rough-walled fracture; Eddy; Micro particle image velocimetry; Flow regime;

    机译：非线性流动;粗糙骨折;涡流;微粒图像速度;流动制度;

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