Dispersion & Reactive Flow in Porous Media — Lesson 3

This lesson covers the concept of dispersion in porous media, focusing on the process of miscible displacement. It explains how the flow occurs in porous media, leading to the mixing of solute or tracer. The lesson also discusses the step change in concentration and how it affects the concentration profile at the outlet. It further elaborates on the characterization of porous media based on the mixing process. The lesson introduces the concepts of dispersion coefficient, Peclet number, and dimensionless time. It also discusses the effect of stagnant zones and fractures on the flow and mixing in porous media. The lesson concludes with the governing equation for reactive flow in porous media, taking into account accumulation, diffusion, convection, and reaction.

Video Highlights

00:25 - Discussion on miscible displacement and dispersion of solute in porous media
04:20 - Introduction to dispersion coefficient, Peclet number, and dimensionless time
11:46 - Discussion on the effect of stagnant zones and fractures on flow and mixing
20:30 - Explanation of the governing equation for reactive flow in porous media

Key Takeaways

- The flow in porous media leads to the mixing of solute or tracer, which can be characterized by observing the concentration profile at the outlet.
- The dispersion coefficient, Peclet number, and dimensionless time are key parameters in understanding the dispersion process in porous media.
- Stagnant zones and fractures can significantly affect the flow and mixing in porous media.
- The governing equation for reactive flow in porous media takes into account accumulation, diffusion, convection, and reaction.