顶置渗透廊土壤强制通风下气液两相流动实验

本文搭建了带顶置渗透廊及强制通风条件下土壤内气液两相流动的可视化实验系统,对气、液在土壤中的流动特性进行了实验研究,测量了不同条件下土壤内的液体流量、液体饱和度等参数。实验结果显示:土壤的结构在多次通水通气后而逐渐趋于稳定,液体流量在通气后会有所降低,而液体饱和度分布则由于受气体流动阻力的影响而变化趋势较为缓慢。

EXPERIMENTAL INVESTIGATION ON TWO-PHASE FLOW IN SOIL WITH AN INFILTRATION GALLERY AT THE TOP

A visualization test setup was built for researching the two-phase flow behaviors in soil with an infiltration gallery at the top. In experiment, water was drained downwards by the gravity and air was forced to move upwards by an air jet. The liquid flux, air flux, airside pressure drop, and liquid saturation profile in the soil were measured. Effects of water level in the infiltration gallery, the bottom thickness of the infiltration gallery, and air flux on water flux and the airside pressure drop were studied, respectively. Experimental results show that the soil structure gradually becomes stable after water and air fed into the soil. As air flux increases, the water flux decreases while the airside pressure drop increases. A higher water level and a thinner bottom of infiltration gallery leads to a larger water flux. The liquid saturation profile in soil becomes more even as water flux and air flux increasing.