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首页> 外文期刊>International Journal of Multiphase Flow >Three-dimensional fingering structures in immiscible flow at the crossover from viscous to capillary fingering
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Three-dimensional fingering structures in immiscible flow at the crossover from viscous to capillary fingering

机译：三维指法结构在粘性对毛细管指法的粘性交叉中不混溶的流动

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Fluid displacement experiments were performed with immiscible fluids in a packed bed of glass spheres. The three-dimensional (3D) structure of the fingering pattern was visualized by computer tomography (CT) for a range of capillary numbers (Ca) between 5.22 x 10(-7) and 1.04 x 10(-4) at the viscosity ratio of log M = -2.203 in the absence of the influence of buoyancy force. Based on the 3D CT images, the characteristics of the fingering pattern at the crossover from viscous fingering (VF) to capillary fingering (CF) were investigated quantitatively. The structure of the fingering pattern changed gradually from streak-like for VF to more compact for CF with a decrease in Ca. Associated with the crossover from VF to CF, saturation of the invading phase (IP) and the fractal number of the structure both increased. The invaded pore size and invaded throat size distributions were also estimated for all values of Ca. The invaded pore size distribution was similar for all Ca values, but a clear shift in the throat size distribution was observed with the crossover from VF to CF. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在玻璃球的填充床中用不混溶的流体进行流体位移实验。指向图案的三维（3D）结构通过计算机断层扫描（CT）可视化在5.22×10（-7）和1.04×10（-4）之间的一系列毛细管数（CA），粘度比在没有浮力的影响的情况下，在没有影响力的情况下记录m = -2.203。基于3D CT图像，定量地研究了从粘性指法（VF）到毛细管指向（CF）交叉的指向图案的特性。指向图案的结构从条纹的逐渐变化，以便在CA减少的CF中更紧凑。与从VF到CF的交叉相关联，侵入阶段（IP）的饱和度和结构的分形数量增加。对于所有CA的所有值，也估计了入侵的孔径和侵入喉部尺寸分布。侵入的孔径分布对于所有CA值相似，但随着从VF到CF的交叉观察到喉部尺寸分布的清晰移位。 （c）2019年elestvier有限公司保留所有权利。

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