Seepage flows instability in porous media |
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| Authors: | VR Dushin VF Nikitin JC Legros M Thiercelin |
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| Institution: | 1. Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;2. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China |
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| Abstract: | The goal of the present study is to investigate analytically, numerically and experimentally the instability of the displacement of viscous fluid by a less viscous one in two- and three-dimensional channels, and to determine characteristic size of entrapment zones. Experiments on miscible displacement of fluids in Hele–Shaw cells were conducted under microgravity conditions. Extensive direct numerical simulations allowed investigating the sensitivity of the displacement process to variation of values of the main governing parameters. The influence of three-dimensional effects (aspect ratio) on displacement instability was studied. One-dimensional model to simulate mixing flux due to frontal displacement instability was developed for engineering applications. |
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