Diffusion Mechanisms — Lesson 2

This lesson covers the concept of flow through porous media, focusing on the transport mechanisms involved. It delves into Darcy's law, permeability, porosity, and the role of viscous flow. The lesson also explores diffusion, including Fick's first and second laws, and the concept of surface diffusion. It further discusses the impact of pore size on diffusion and introduces the concept of Knudsen diffusion. The lesson concludes with an explanation of the Klinkenberg equation, which describes the non-linear permeability of a medium.

Video Highlights

00:34 - Introduction to Fick's first and second laws
02:26 - Discussion on surface & Knudsen diffusion
03:17 - Discussion on the impact of pore size on diffusion
23:56 - Introduction to the Klinkenberg equation

Key Takeaways

- Darcy's law is a fundamental principle in understanding flow through porous media.
- Different transport mechanisms, such as viscous flow and diffusion, can operate in a porous medium.
- The size of the pores in a medium can significantly impact the type of diffusion that occurs.
- The Klinkenberg equation describes the non-linear permeability of a medium, which becomes important when dealing with gas flow in reservoirs or shale.