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• Main Authors: Chih-Heng Chiu, 邱致衡
• Other Authors: Chih-Ang Chung
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/5854yj

碩士 === 國立中央大學 === 機械工程學系 === 106 === This research presents the experimental studies of unstable activity during drainage in porous media. We show the pressure variation of fluid displacement through the porous media with different volume flowrate, to understand the flow feature and displacing behavior. We used horizontal linear Hele-Shaw cells involve pore-scale cylindrical obstacle as an experimental model. The less viscous fluid (air) displaces the more viscous fluid (water) through the porous media, the finger-like flow patterns formed in the medium, which decrease the viscous fluid displacement. We design heterogeneous porous models consisting of five kinds of length ratio of small-particles filling length to large-particles filling length, equal to 0, 0.25, 0.5, 0.75, 1, for investigating physical mechanism that influences the flow displacement. 　 The results show that the experimental viscous pressure drops of five kinds of length ratio are lower than the theoretical values because the air viscous drag is included. The air saturation increase with increasing length ratio. However, the small capillary difference between the heterogeneous interface of porous media, the displacement is not influenced by the capillary difference.