Two-phase flows of viscous oil and water through singularities such as sudden area contractions/expansions have been taken into limited consideration in the relevant scientific literature. Nevertheless, they play a role of primary importance in industrial systems, for instance, but not only, in the exploitation of oil wells and pipelines. The proposed work is based on the comparison of photographic images of the flow patterns taken from three points of view, i.e. upper, lower and frontal, thanks to a couple of mirrors ±45° inclined with respect to the horizontal plane. Oil-water flow regimes have been observed both upward and downward of five horizontal test sections with diameter ratios d/D = 40/50, 30/50, 30/40, respectively. The observed structures of the oil-water interface, especially for core-annular flows, has suggested also detecting flow patterns in a 30 mm straight pipe for sake of comparison. Actually, the shape of the oil-core interface appears significantly influenced by the sharp-edged area change as well as by the expected momentum variation.
展开▼
机译：在相关科学文献中，已在有关地区收缩/扩展如突然区域收缩/扩展等奇异性的两相流量。然而，他们在工业系统中发挥着初步重要性的作用，例如，但不仅在剥削油井和管道中。所提出的工作基于从三个观点所采取的流动模式的摄影图像的比较，即上下，下和前部，由于几个镜子±45°倾斜于水平面。已经观察到油水流动制度的五个水平试验部分的向上和向下，其直径比率分别为D / D = 40/50,30 / 50,30 / 40。观察到的油水界面的结构，特别是对于芯环流量，建议在30mm直管中检测流动模式，以便进行比较。实际上，油芯界面的形状显着受到尖锐边缘区域变化以及预期的动量变化的显着影响。
展开▼
