| Summary: | 碩士 === 國立交通大學 === 土木工程系 === 92 === Contaminants exist in aquifer on pollution site on behave of three phase-type including of water phase, air phase and NAPLs. If we comprehend the relations of between relative permeability, saturation, and capillary pressure, the transport behavior of NAPLs in subsurface and groundwater could be described completely. Although the sand tank model is conventionally adopted to examine the relation permeability, saturation and capillary pressure, this model is difficult to control, has a low accuracy, and lacks experience in repeats. This study adopts the perspective micro-model and performs digital image analysis (DIA) to examine the micro-behavior of multiphase flow systems in porous media and obtain the curve of relation between relative permeability, saturation, and capillary pressure. The perspective micro-model allows experimenters to clearly observe the multiphase flow systems in porous media. Additionally combining the model with digital image analysis, allows us to precisely measure the saturation of media. Moreover, by using laser tools, a large number of porous media which are identical in all aspects can be reproduced to repeat numerous comparative sets of an experiment.
This study successfully obtains the k-S-P relationships of coexisting three-fluids using micro-model experiment. This approach is different from previous study which combines with the data of k-S curve and P-S curve. And then, the k-S-P relationships could be obtained by k-S curves and P-S curves. The results in this study also reveal that different saturation ratio of non-wetting phase (NAPL phase and gas phase) in three-fluids; the relative permeability of wetting phase (water) would be indeed affected.
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