Data on coupled hydrothermal flow in fine sands based on X-ray CT imaging and numerical simulation

Coupled hydrothermal flow can occur in soils, for example in applications such as ground heat storage and nuclear waste disposal. Therefore, approaches to quantitative analysis of water transfer in response to imposed thermal gradients are required, especially in unsaturated conditions. Analysis methods also require validation by laboratory and field data, which can be hard to obtain. This dataset includes the processed results from X-ray µCT experiments where specimens of a fine sand and a fine silty sand were subjected to heating from their base. Repeated scans, set up to balance image quality and scan duration, were carried out during the heating process, on specimens between 20% and 50% saturation. Gaussian decomposition techniques were used to determine the changing soil phase proportions throughout the experiments, which are reported here. The CT data is accompanied by COMSOL files for simulation of the experiments on the fine sand. The dataset is to accompany the paper at https://doi.org/10.1016/j.gete.2022.100380 and provides the processed information used to construct the key results figures in that paper.岩土体中可发生耦合水热流过程，例如在地热储能、核废料处置等工程应用场景中。因此，亟需建立针对热梯度作用下水分运移的定量分析方法，尤其是非饱和条件下的相关分析方法。此类分析方法还需通过实验室与现场实测数据进行验证，但这类数据往往较难获取。 本数据集包含X射线显微计算机断层扫描（X-ray µCT）实验的处理结果：实验对象为细砂与粉细砂试样，采用底部加热方式；实验过程中，针对饱和度介于20%至50%之间的试样，开展了多次扫描以平衡成像质量与扫描时长。本实验全程通过高斯分解技术分析得到的土壤各相占比变化结果已收录于本数据集。 X射线CT数据同步附带了用于细砂实验模拟的COMSOL仿真文件。 本数据集配套于论文https://doi.org/10.1016/j.gete.2022.100380，提供了用于构建该论文核心结果图件的处理后数据。