The Observation and Analysis of the Anisotropic Flow in a Synthetic Rock Fracture

• Main Authors: Ying-Ling Pai, 白英鈴
• Other Authors: Jian-Li Wang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/43771486515142903572

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 91 === A laboratory system is established to observe the anisotropic flow through a synthetic rock fracture. The rock fracture is made of a cement-gypsum mixture. In order to study the effect of anisotropy, four different patterns of rough surfaces are planned. Accordingly, total of six scenarios are investigated. In each scenario, different observations are carried out and the flow conditions are recorded. The experimental results are then compared with the numerical analysis carried out by the program, PDEase2D. The findings of this study are as following： 1.The different water intake position could cause the discrepancy of the flow condition. 2.The flow appears “condensed” in the interface between the smooth and rough areas. The condition of roughness and the direction of flow have an effect on the overall flow behavior. 3.The observed flow velocity is laminar according to Reynold’s criteria. The fracture flow is strongly influenced by the viscosity and adhesion. 4.In most cases of open channel flow, the flow velocity is observed to decrease downstream. In some cases of fracture flow, the flow velocity is observed to increase downstream. 5.Overall, the numerical simulation of PDEase2D indicates the same trend of the flow pattern as the experimental observation.