Dynamic Capillary Fringe: Flow and Transport Processes

动态毛细管边缘（CF）提出了一些基本的问题，起源于从连续到不连续的过渡，最后到一个失踪的空气相。这显然会影响气相中的传输，但也会影响与空气流强烈耦合的水流的形成。在这个子项目中，我们希望（i）调查在瞬态强迫下CF的动力学，并评估它在多大程度上可以由有效的连续属性表示，（ii）确定在瞬态强迫下残余气相的形成和溶解，以及（iii）研究CF的包气带水相的分散现象，和地下水，特别是探索有效的配方，为三个地区。实验将在Hele-Shaw细胞中进行，并通过光透射，近红外成像光谱和小型张力计阵列进行观察。将在SP Z中心实验设施中进行全三维研究。在第二阶段，将研究颗粒物的运输以及生物膜对流动和运输的影响。

A dynamic capillary fringe (CF) poses a number of fundamental problems that originate in the transition from a continuous to a discontinuous and finally to a missing air phase. This apparently affects transport in the gas phase but also the very formulation of water flow which becomes strongly coupled with the air flow. In this sub-project, we want to (i) investigate the dynamics of the CF under transient forcing and assess the extent to which it may be represented by effective continuum properties, (ii) determine the formation and dissolution of a residual gas phase under transient forcing, and (iii) study dispersion phenomena in the water phase of the vadose zone, of the CF, and of the groundwater and in particular explore effective formulations for the three zones. The experiments will be run in Hele-Shaw cells and observed through light transmission, near-infrared imaging spectroscopy, and small tensiometer arrays. Full three-dimensional studies will be conducted in the central experimental facility of SP Z. In the second phase, transport of particulate matter will be studied as well as the impact of biofilms on flow and transport.