Dyga Roman, Płaczek Małgorzata
Department of Process Engineering, Opole University of Technology, 45-271 Opole, Poland.
Materials (Basel). 2020 Jul 22;13(15):3254. doi: 10.3390/ma13153254.
This paper reports the results of a study concerned with air-water and air-oil two-phase flow pattern analysis in the channels with open-cell metal foams. The research was conducted in a horizontal channel with an internal diameter of 0.02 m and length of 2.61 m. The analysis applied three foams with pore density equal to 20, 30 and 40 PPI (pore per inch) with porosity, typical for industrial applications, changing in the range of 92%-94%. Plug flow, slug flow, stratified flow and annular flow were observed over the ranges of gas and liquid superficial velocities of 0.031-8.840 m/s and 0.006-0.119 m/s, respectively. Churn flow, which has not yet been observed in the flow through the open-cell foams, was also recorded. The type of flow patterns is primarily affected by the hydrodynamic characteristics of the flow, including fluid properties, but not by the geometric parameters of foams. Flow patterns in the channels packed with metal foams occur in different conditions from the ones recorded for empty channels so gas-liquid flow maps developed for empty channels cannot be used to predict analyzed flows. A new gas-liquid flow pattern map for a channel packed with metal foams with the porosity of 0.92-0.94 was developed. The map is valid for liquids with a density equal to or lower than the density of water and a viscosity several times greater than that of water.
本文报道了一项关于开孔金属泡沫通道内气-水和气-油两相流型分析的研究结果。该研究在一个内径为0.02 m、长度为2.61 m的水平通道中进行。分析采用了三种孔隙密度分别为20、30和40 PPI（每英寸孔隙数）的泡沫，其孔隙率在工业应用中较为典型，范围为92% - 94%。在气体和液体表观速度分别为0.031 - 8.840 m/s和0.006 - 0.119 m/s的范围内，观察到了柱塞流、段塞流、分层流和环状流。还记录到了在通过开孔泡沫的流动中尚未观察到的搅混流。流型的类型主要受流动的流体动力学特性影响，包括流体性质，但不受泡沫的几何参数影响。填充金属泡沫的通道中的流型出现在与空通道记录的条件不同的情况下，因此为空通道开发的气液流型图不能用于预测分析的流动。开发了一种适用于孔隙率为0.92 - 0.94的填充金属泡沫通道的新气液流型图。该图适用于密度等于或低于水的密度且粘度比水大几倍的液体。
