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3 cards from this section. Quick, good the night before a test.
Define diffusion in terms of concentration.
Think about how smells spread in a room.
What is the primary factor affecting effective diffusivity?
How open is the material?
What drives the process of diffusion?
It's about where something is more and less present.
True or False: The local equilibrium assumption holds true for all flow velocities.
At high speeds, processes change quickly.
Describe a real-world scenario where the local equilibrium assumption may fail. What implications would that have for modeling diffusion?
Consider factors like time and speed in response to diffusion.
Using Fick's laws, derive the mathematical expression for effective diffusivity in a soil-water system, incorporating porosity.
Start with diffusion equations and how they relate to porous media.
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