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Retaining primary wall roughness for flow in rock fractures and implications on heat transfer and solute transport

机译：保留岩石骨折流动的主要墙粗糙度及传热和溶质运输的影响

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摘要

Wall roughness is often found to have evident influences on flow-related processes in rock fractures. In this work, we first define the primary wall roughness to have dominating effects on the overall flow, whereas the secondary roughness only generates additional flow resistance and have insignificant impacts on the bulk flow. Accordingly, an effective procedure is presented to quantitatively identify primary and secondary roughness, and the validity of the procedure is tested with flow simulations in a two-dimensional rough fracture. The results show that the reconstructed fracture with only primary roughness can still well resemble the general flow behavior in the original fracture with a steady transmissivity increment of 5% for the Reynolds number from 0.01 to 100. We further examine the effects of both primary and secondary roughness on processes associated with heat transfer and solute transport in fracture flow. It is found that the heat transfer and solute transport behaviors are closely related to the flow behavior under the effect of wall roughness. As the flow velocity increases to cause strong flow inertia, larger eddies can occur to affect the heat transfer and solute transport processes. Although the presence of secondary roughness shows limited effects on the overall transport behaviors, secondary roughness is found to give rise to more irregularly-shaped eddies, which result in different local behaviors. The findings in this study can provide new insights into the roughness effect on fracture flow and associated processes. In addition, the roughness quantification presents a straight-forward evaluation of potential deviations when neglecting small-scale secondary roughness, as is often needed when analyzing larger-scale problems.
机译：通常发现墙壁粗糙度在岩石骨折中对流动相关过程的显而易见的影响。在这项工作中，我们首先定义主墙粗糙度，以对整体流动的主导效果，而二次粗糙度仅产生额外的流动阻力，并且对散装流量具有微不足道的影响。因此，提出了一种有效的方法以定量识别初级和二次粗糙度，并且在二维粗糙骨折中以流动模拟测试程序的有效性。结果表明，只有初级粗糙度的重建骨折仍然可以很好地类似于原始骨折中的一般流动行为，雷诺数的稳定透射率增加到0.01至100的雷诺数。我们进一步检查了初级和次级的效果粗糙度粗糙度与骨折流动溶质转运的粗糙度。结果发现，热转印和溶质运输行为与壁粗糙度的效果下的流动性密切相关。随着流速增加以引起强流量惯性，可能发生较大的漩涡以影响传热和溶质运输过程。尽管二次粗糙度的存在显示对整体运输行为的有限影响，但发现二次粗糙度产生更不规则形状的漩涡，这导致不同的局部行为。本研究中的研究结果可以为对骨折流动和相关过程的粗糙效果提供新的见解。另外，粗糙度定量在忽略小规模的二次粗糙度时，潜在偏差的直接评估，如在分析更大规模问题时通常需要。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121488.1-121488.12|共12页
  • 作者

    Zhihe Wang; Jun Wang; Changtai Zhou; Cunbao Li; Heping Xie;

  • 作者单位

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences andGreen Energy College of Civil and Transportation Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen University Shenzhen 518060 China School of Civil Environmental and Mining Engineering University of Adelaide Adelaide 5005 Australia;

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences andGreen Energy College of Civil and Transportation Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen University Shenzhen 518060 China;

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences andGreen Energy College of Civil and Transportation Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen University Shenzhen 518060 China;

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences andGreen Energy College of Civil and Transportation Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen University Shenzhen 518060 China;

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences andGreen Energy College of Civil and Transportation Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen University Shenzhen 518060 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rock fracture; Roughness effect; Fracture flow; Heat transfer; Solute transport;

    机译：岩石骨折;粗糙效应;骨折流动;传播热量;溶质运输;

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