Direct characterization of solute transport in unsaturated porous media using fast X-ray synchrotron microtomography.

ABSTRACT: Solute transport in unsaturated porous materials is a complex process, which exhibits some distinct features differentiating it from transport under saturated conditions. These features emerge mostly due to the different transport time scales at different regions of the flow network, which can be classified into flowing and stagnant regions, predominantly controlled by advection and diffusion, respectively. Under unsaturated conditions, the solute breakthrough curves show early arrivals and very long tails, and this type of transport is usually referred to as non-Fickian. This study directly characterizes transport through an unsaturated porous medium in three spatial dimensions at the resolution of 3.25 μm and the time resolution of 6 s. Using advanced high-speed, high-spatial resolution,

SUBMITTER: Hasan S 

PROVIDER: S-EPMC7519338 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature