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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。
In order to detect the internal structure of porous media and the distribution of velocity between particles, the NMR images of agar spheres under saturated conditions were obtained and the velocity field images were obtained under three different flow rates. Meanwhile, in order to determine the pore parameters of porous media, the internal structure of the porous media was obtained by using image processing technology. The results show that the porosity of the porous medium is 31.28%, and the fitted curve of pore equivalent diameter distribution satisfies the Gaussian distribution. The velocity field varies with the flow rate and the fluid in the pore is heterogeneous. The distribution of velocity in the pore is approximate In the parabolic shape, the local maximum is around the center; about half of the velocity component is between 0 and 1 cm / s; the larger the flow rate, the lower the frequency of the low velocity component, and the opposite of the high velocity component.