多孔介质中稳定泡沫的流动计算及实验研究

将多孔介质简化为一簇变截面毛管束，根据多孔介质的颗粒直径、颗粒排列方式、孔喉尺度比及束缚水饱和度，计算出变截面毛细管的喉道半径和孔隙半径. 在考虑多孔介质喉道和孔隙中单个气泡的受力和变形基础上，利用动量守恒定理，推导出单个孔隙单元内液相的压力分布和孔隙单元两端的压差计算公式，最终得到多孔介质的压力分布计算公式. 利用长U型填砂管对稳定泡沫的流动特性进行了实验研究. 研究结果表明:稳定泡沫流动时多孔介质中的压力分布呈线性下降，影响泡沫在多孔介质中流动特性的因素包括:多孔介质的孔喉结构、泡沫流体的流量和干度、气液界面张力、气泡尺寸，其中孔喉结构和泡沫干度是影响泡沫封堵能力的主要因素.关键词: 稳定泡沫；多孔介质；变截面毛管；流动；表观粘度；压力分布；实验研究 

NUMERICAL SIMULATION AND EXPERIMENTAL INVESTIGATION ON STEADY FLOW FOAM IN POROUS MEDIA

Porous media is firstly simplified as a bunch ofconstricted capillary tubes related to grain diameter, particle arrangement,pore-throat scaling ratio and saturation of immobile water. Based on thedeformation characteristics of a single bubble in throat and pore of porousmedia, pressure distribution of fluid phase is derived from the conservationof momentum in a single pore unit, to obtain the equation for pressuredistribution in porous media. Moreover, the experiments on flow foam inU-shape sandpack are investigated. The results demonstrate the lineardecreasing pressure distribution of steady foams in porous media and theinfluencing factors, i.e., pore-throat structure, flowing rate and qualityof foams, interfacial tension of gas and liquid, bubble size in pore media.Furthermore, the results show further that pore-throat structure and foamquality have the most influence on the blocking ability of foams in porousmedia.