NMR_T2_evaporation-of-water_porous-media

Nuclear magnetic resonance (NMR) transversal relaxation time T2 during evaporation of water from porous media was collected. Both homogeneous and inhomogeneous porous media was applied in experiments. Homogeneous porous media was made of uniform-sized glass beads with diameter at either 25 μm or 150 μm. Inhomogeneous porous media included two parts with top and bottom part made of fine and coarse beads respectively. By adjusting the proportion of each part, multiple inhomogeneous porous media was made. The temperature during experiment was controlled at 50 °C and T2 data was recorded every 30 minutes (individual experiment lasted from 3 to 5 days). Carr-Purcell-Meiboom-Gill (CPMG) sequence was applied in data recording and parameters were set at TE=0.2 ms and NECH=18000. Each recording collects 5000 pairs of T2 and corresponding signal amplitude, based on which the transient water content and distribution could be obtained.本数据集收录了多孔介质中水蒸发过程中的核磁共振（Nuclear Magnetic Resonance, NMR）横向弛豫时间T2数据。实验中使用了均质与非均质两类多孔介质：均质多孔介质由粒径均一的玻璃微珠制备，微珠直径分别为25 μm或150 μm；非均质多孔介质分为上下两个部分，上部由细玻璃微珠构成，下部由粗玻璃微珠构成，通过调整两部分的体积占比可制备多种不同的非均质多孔介质。实验过程中将温度控制为50 ℃，每30分钟记录一次T2数据，单次实验的持续时长为3至5天。数据采集采用卡尔-普尔-迈鲍姆-吉尔（Carr-Purcell-Meiboom-Gill, CPMG）脉冲序列，实验参数设置为回波时间TE=0.2 ms、回波数NECH=18000。每次采集可获取5000组T2值与对应信号幅值的配对数据，基于该组数据可得到瞬态含水量及其分布特征。