Mixing, Delay, and Restart - Fluid-Solid Reaction Efficiency in Incompletely-Mixed Porous Media

Explore the complex dynamics of fluid-solid reactions in porous media through this 45-minute lecture by Dr. Tomás Aquino, a researcher at the Institute for Environmental Assessment and Water Research. Delve into the challenges of modeling reaction rates in heterogeneous media, where transport limitations can significantly impact traditional estimates. Examine the role of medium structure and flow in dictating mixing and reaction rates, with a focus on chaotic advection in saturated porous media. Learn about a stochastic restart model that mimics efficient mixing due to chaotic exploration of the pore space, and its impact on reaction efficiency. Gain insights into the factors influencing reaction rates, including available surface area, flow rate, and interface shear. Conclude with current perspectives on modeling incompletely-mixed reaction rates in unsaturated porous media, covering topics such as the critical zone, bar scale challenges, continuous time random block, delay structure, experimental results, and particle tracking.

Introduction
The critical zone
Bar scale
Challenges
Outline
Collaborators
Continuous time random block
Delay structure
Experimental results
Theory convection
Flow through porous media
Impact on surface reaction rates
Impact on reaction efficiency
Mean first message times
Restart process
Chaos mixing
Model restart time
Perspective
Velocity statistics
Reaction rates
Particle tracking
Overview