What is a Pore? Understanding Porosity and Transport in Porous Materials
Seminar recording, EN
This seminar introduces the fundamentals of pore structures, including pore bodies, pore throats, and closed pores. Learn how to measure pore sizes digitally using GeoDict and explore practical methods within the software. Real-world examples - such as battery materials and rock structures - will be used as examples to apply these techniques. The session concludes with guidance on inspecting and visualizing results for effective digital analysis.
In this seminar you will learn:
- Defining the Basics: The seminar begins by establishing clear definitions for essential terms like pore space, pore body, and pore throat.
- Pore Size Analysis in GeoDict: See four distinct methods demonstrated on a battery cathode and a Berea sandstone structure:
- Granulometry: Measures pore size by geometrically fitting spheres into the void space. This approach is uniquely capable of identifying and measuring closed, isolated pores.
- Porosimetry: Simulates fluid intrusion from a boundary to identify the limiting pore throats. The space behind a throat is assigned the throat's diameter. This method does not detect pores disconnected from the main network.
- Percolation Path: Calculates the diameter of the largest sphere that can pass through the entire structure , a critical value for assessing resolution and for transport simulations.
- Identify Pores: Uses ellipsoid fitting to individually segment, label, and analyze every pore , including closed pores.
- Deconstructing Tortuosity:
- The seminar challenges the idea of a single tortuosity value, exploring its various definitions: geometric, physics-based, and mixed.
- Learn how to compute different, application-specific tortuosities in GeoDict, including:
- Geodesic Tortuosity: Based on the mathematically shortest path through the pore space.
- Diffusive Tortuosity: Derived from solving the Laplace equation to describe how the structure impedes diffusive transport.
- The session stresses the importance of choosing the correct tortuosity for your specific application, as a geodesic path, for example, is rarely representative of actual fluid flow or diffusion.
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More Information
Chapters in YouTube Video
0:00 Intro
1:07 The Problem with Pores
4:03 The Anatomy of a Pore
12:05 Four Methods to Measure a Pore
29:18 The Many Faces of Tortuosity
41:43 Q&A Section
42:03 Question 1
43:03 Question 2
44:28 Question 3
45:05 Question 4
46:24 Question 5
47:29 Quesiton 6
47:29 Outlook on our next Online Seminar
