基于核磁共振成像技术的饱和多孔介质孔隙结构及溶液流速分布探测（英文）

发布时间：2018-06-02 18:06

  本文选题：核磁共振成像 + 多孔介质　； 参考：《Transactions of Nonferrous Metals Society of China》2016年05期

【摘要】：为了探测多孔介质的内部结构及颗粒间流速分布,对饱和条件下的琼脂球散体进行核磁共振成像试验,获取了3种流量下的速度场图像。同时,为了确定多孔介质的孔隙参数,利用图像处理技术获取了其内部结构。结果表明:该多孔介质的孔隙率为31.28%,其孔隙当量直径分布拟合曲线满足高斯分布;流速场随着流量的改变而变化且孔隙内的流体为非均质流;孔内流速分布近似于抛物线状,局部最大值位于中心附近;约一半的速度分量在0~1 cm/s之间;流量越大,低速度分量的频率越低,而对于高速度分量,则恰恰相反。
[Abstract]:In order to detect the internal structure of porous media and the velocity distribution between particles, the magnetic resonance imaging (NMR) of Agar sphere particles under saturated conditions was carried out, and the velocity field images at three different flow rates were obtained. At the same time, in order to determine the pore parameters of porous media, the internal structure of porous media was obtained by image processing technology. The results show that the porosity of the porous medium is 31.28, the fitting curve of the pore equivalent diameter distribution satisfies the Gao Si distribution, the velocity field changes with the flow rate and the fluid in the pore is heterogeneous, and the velocity distribution in the pore is similar to parabola. The local maximum value is located near the center; about half of the velocity component is between 0 and 1 cm/s; the higher the flow rate, the lower the frequency of the low velocity component, while for the high velocity component, the opposite is true.
【作者单位】： 北京科技大学金属矿山高效开采与安全教育部重点实验室;北京科技大学土木与环境工程学院;
【基金】：Project(51374035)supported by the National Natural Science Foundation of China Project(2012BAB08B02)supported by the National Science&Technology Pillar Program During the Twelfth Five-year Plan Period Project(NCET-13-0669)supported by the New Century Excellent Talents in University of Ministry of Education of China
【分类号】：TB383.4
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本文编号：1969688