...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transport in Porous Media >Visualization and Characterization of Heterogeneous Water Flow in Double-Porosity Media by Means of X-ray Computed Tomography
【24h】

Visualization and Characterization of Heterogeneous Water Flow in Double-Porosity Media by Means of X-ray Computed Tomography

机译：X射线计算机断层摄影术在双孔隙介质中非均质水流的可视化和表征

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Three-dimensional visualization of dynamic water transport process in soil by computed tomography (CT) technique is still limited by its low temporal resolution. In order to monitor dynamically water transport in soil, a compromise has to be found between water flow velocity and CT acquisition time. Furthermore, an efficient image analysis method is necessary. In this work, we followed the water transport in three dimensions by CT imaging across a double-porosity media constituted of two distinct materials, i.e. sand and porous clay spheres. The CT acquisition parameters were adjusted to the water pore velocity so that we succeeded to register the water front displacement per time range of 25 min. We also used the image subtraction method to extract water distribution evolution with time with a space resolution of . Both time and space resolution are relatively high compared with other dynamic studies. The water content profiles showed that the clay spheres remained in their dry state during water infiltration, while the water transport only occurred in the sand matrix. These results are consistent with macroscopic experiments. The water front visualized by CT showed a non-symmetrical shape which was related to water transfer in non-equilibrium as shown by column displacement experiments.
机译：通过计算机断层扫描（CT）技术对土壤中水的动态输运过程进行三维可视化仍然受其低时间分辨率的限制。为了动态监测土壤中的水分传输，必须在水流速和CT采集时间之间找到一个折衷方案。此外，需要有效的图像分析方法。在这项工作中，我们通过在由两种不同材料（即沙子和多孔黏土球体）构成的双孔隙介质上进行CT成像，追踪了水的三维传输。将CT采集参数调整为水孔隙速度，以便我们成功记录每25分钟的时间范围内的水锋位移。我们还使用图像减法提取了随时间变化的水的分布演化，空间分辨率为。与其他动态研究相比，时间和空间分辨率都相对较高。水分剖面表明，粘土球在渗水过程中保持干燥状态，而水分仅在砂质基质中发生。这些结果与宏观实验一致。 CT观察到的水锋呈非对称形状，这与色谱柱位移实验表明的非平衡状态下的水转移有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号