论文标题
在三维多孔培养基中通过两相流的光学荧光可视化
Visualization by optical fluorescence of two-phase flow in a three-dimensional porous medium
论文作者
论文摘要
通过达西定律，单个流体通过多孔培养基的缓慢流通过宏观水平，流速与压力差异，粘度和重力力的组合之间的线性关系。分离流体的界面使两相流程变得复杂，但是从使用透明细胞的实验中获得了对二维两相流的理解。但是，在大多数三维媒体中，视觉观察很困难。在这里，我们介绍了由随机填充玻璃球体组成的模型培养基上实验的初步结果，其中一种荧光液会侵入另一种荧光液。通过折射索引匹配并使用板状激光束进行扫描，我们获得了流图的切片，我们将其结合成三维图片。我们观察到一个紧凑的入侵流体区域，周围是手指样突起。随着入侵者流量的增加，紧凑区域变得更加主导。理论上根据引力，粘性和毛细作用力之间的相互作用对模式进行了分析。
Slow flow of a single fluid through a porous medium is well understood on a macroscopic level through Darcy's law, a linear relation between flow rate and a combination of pressure differences, viscosity, and gravitational forces. Two-phase flow is complicated by the interface separating the fluids, but understanding of two-dimensional, two-phase flow has been obtained from experiments using transparent cells. In most three-dimensional media, however, visual observation is difficult. Here, we present preliminary results of experiments on a model medium consisting of randomly packed glass spheres, in which one fluorescent liquid invades another. By refractive index matching and scanning with a sheet-shaped laser beam, we obtain slices of the flow patterns, which we combine into three-dimensional pictures. We observe a compact region of invading fluid, surrounded by finger-like protrusions. The compact region becomes more dominant with increasing invader flow rate. The patterns are theoretically analyzed in terms of the interplay between gravitational, viscous, and capillary forces.
