GeoDict Seminar - What is a pore? Understanding porosity and transport in porous materials.

Why do different methods for measuring pore size often yield different results for the same material? This technical seminar from the experts at Math2Market confronts this fundamental challenge in material science.

Join Jürgen Becker and Anne Blumer as they address the challenges of traditional material analysis. The discussion unpacks the assumptions inherent in indirect methods like Mercury Intrusion Porosimetry (MIP)—such as its reliance on the Washburn equation and the assumption of cylindrical pores. They contrast this with the direct and precise analysis possible with 3D digital models in GeoDict.

This seminar is essential for any professional whose work depends on accurately understanding and modeling porous media.

Key Methodologies and Concepts Explored:

📖 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.

💬 Expert Q&A: The presentation concludes with an expert Q&A session, addressing practical questions on topics like selecting the right tortuosity for battery electrodes and the effect of micro-CT resolution on calculated porosity.

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Chapters:
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
49:43 Thank you for attending - Outro
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Видео GeoDict Seminar - What is a pore? Understanding porosity and transport in porous materials. канала Math2Market GmbH