An Experimental Study of Reaction - Coupled Flow and Mass Transport in Porous Media

多孔介质中反应耦合流动与传质的实验研究

• 批准号: 9418226
• 负责人: Frank Schwartz
• 金额: $ 19万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418226&HistoricalAwards=false
• 关键词: Experimental; Study; Reaction; Coupled; Flow

This experimental study investigates coupled processes of flow and reactive mass in porous media. Of interest are reactive transport processes that involve coupling both through density effects and heterogeneous chemical reactions that may alter the hydraulic character of the medium. The goal of this study is to contribute fundamental knowledge concerning reaction-coupled mass transport. Two and Three-dimensional experiments with flow tanks will be used to elucidate the time-space evolution of reaction fronts and fluid chemistry in porous media, and to interpret the nature of the feedbacks that exist between density-driven flow, and reactive mass transport. The experiments will involve pumping a dilute Fe(CIO4) 3 solution through a mixture of quartz sand and a small quantity of crushed calcite. The initial acidity of the solution will promote calcite dissolution and lead to the precipitation of ferric oxyhydroxide. The resultant pore plugging will result in patterning in hydraulic conductivity and reroute fluid flow through the tanks. These patterns can be documented photog raphically in two-dimensional experiments. The three-dimensional experiments are technically more challenging and require that reaction fronts be described with both in situ hydraulic conductivity measurements and electrical measurements with a permanently installed electrode array. This research builds on our studies of instabilities in variable density flows, and will contribute new knowledge in the emerging area of coupled processes and practical problems of contaminant support.

本实验研究多孔介质中流动与反应质量的耦合过程。 感兴趣的是反应性运输过程，涉及耦合通过密度效应和非均相化学反应，可能会改变介质的水力特性。 本研究的目的是贡献有关反应耦合质量输运的基础知识。 二维和三维实验与流动罐将被用来阐明反应前沿和多孔介质中的流体化学的时空演变，并解释之间存在的反馈的性质密度驱动的流动，和反应质量传输。 实验将涉及将稀释的Fe（ClO4）3溶液泵送通过石英砂和少量破碎方解石的混合物。 溶液的初始酸度将促进方解石溶解并导致羟基氧化铁沉淀。 由此产生的孔隙堵塞将导致水力传导性的图案化，并改变通过罐的流体流动的路线。 这些图案可以在二维实验中用照片记录下来。 三维实验在技术上更具挑战性，并要求反应前沿描述与原位水力传导率测量和电气测量与永久安装的电极阵列。 这项研究建立在我们的研究变密度流的不稳定性，并将有助于新的知识在新兴领域的耦合过程和污染物的支持的实际问题。