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

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。...

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Published in中国有色金属学报：英文版 Vol. 26; no. 5; pp. 1403 - 1409
Main Author 吴爱祥 刘超 尹升华 薛振林 陈勋
Format Journal Article
LanguageEnglish
Published 2016
Subjects
多孔介质
孔隙当量直径
孔隙率
核磁共振成像
流速
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Summary: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。
Bibliography:43-1239/TG
magnetic resonance imaging; porous media; flow velocity; porosity; pore equivalent diameter
Magnetic resonance imaging （MRI） was used to probe the structure and flow velocity within the interparticle space of a packed bed of agar beads under water-saturated condition. The images of the velocity field at three different flow rates were obtained. To determine the pore-parameter of the porous media, the internal structure of the bed was also obtained using image processing technique. The results show that the porosity of the sample is 31.28% and the fitting curve for the distribution of pore equivalent diameter follows Gaussian distribution. The velocity profiles do shift as the flow rate varies and the solution flow through the void space is not a homogeneous flow in any pores. The velocity distributions within the pore are roughly parabolic with the local maximum being near the center. About half of the velocity components are in the class of 0-1 cm/s. The frequency of lower velocity components is lower at higher flow rate, but to higher velocity components, it is just the opposite.
Ai-xiang WU, Chao LIU, Sheng-hua YIN, Zhen-lin XUE, Xun CHEN（1. Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China）
ISSN:1003-6326