考虑温度效应的多孔介质中悬浮颗粒反复渗透迁移过程研究

项目名称： 考虑温度效应的多孔介质中悬浮颗粒反复渗透迁移过程研究

项目编号： No.51279002

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 白冰

作者单位： 北京交通大学

项目金额： 82万元

中文摘要： 研制一个可控制温度的悬浮颗粒渗透迁移试验装置，研究水力渗流作用下饱和多孔介质中悬浮颗粒的反复渗透迁移和沉积动力学过程。通过脉冲注入条件下两种不同尺度的悬浮颗粒与溶液中荧光素钠（示踪剂）穿透过程差异性的比较试验，探索"临界渗透速度"是否存在以及温度效应对它的影响，然后建立悬浮颗粒的迁移和沉积模式。研究热-冷交替变化过程中，不同尺度的悬浮颗粒和不同浓度的悬浮颗粒的迁移和沉积过程，揭示温度的反复变化对悬浮颗粒迁移、沉积和释放相互转化过程的物理机制。基于对流-扩散-沉积动力学过程，引入温度效应影响因子，建立一个考虑渗透速度、悬浮颗粒大小和浓度变化等耦合影响的理论模型。以一维问题为例，利用Laplace变换及其数值逆变换，示范性地发展一个悬浮颗粒浓度随时间变化的悬浮颗粒迁移和沉积过程的理论求解方法。这些研究在诸如污染物治理、地热资源开发、地下水开采、热能贮存和化学工业等工程领域有重要的应用价值。

中文关键词： 饱和多孔介质；悬浮颗粒；反复渗透迁移；脉冲注入；温度效应

英文摘要： The hydrodynamic processes of repeated transport and deposition of suspended particles in permeable saturated porous media considering temperature effect are studied by laboratory tests. For this purpose, a temperature-controlled apparatus suited for permeability tests of suspended particles is developed. The patterns of the breakthrough curve between two suspended particles with different sizes and fluorescein (i.e. uranine; as a dissolved tracer) by pulse injection are compared by the test results of laboratory columns, which are used to analyze the existence of the so-called "critical flow velocity" and the impacts of temperature. Following these results, the models of the transport and deposition of suspended particles are then proposed. The processes of the transport and deposition of suspended particles for different sizes and different concentration during repeated heating-cooling processes are discussed, and furthermore the mechanism of the migration, deposition and release of suspended particles due to temperature variation are analyzed. Based on a convection-dispersion-deposition equation, a theory considering the coupled effects of the flow velocity, particle size and concentration of suspended particles is established by introducing a temperature factor. For one-dimensional problem, an analytical sol

英文关键词： saturated porous media；suspended particle；repeated transport；pulse injection；temperature effect