By Math2Market
The bubble point is a key parameter in the characterization of porous materials such as filter media, membranes, textiles, and paper structures. It refers to the pressure at which the first gas bubble pushes through the largest liquid-filled pore of a material. This point marks the transition from a fully liquid-saturated state to one that is permeable to gas, providing direct insight into the material's largest effective pore size. In practice, the bubble point is an important quality indicator: - In filtration technology, it is used to evaluate filter retention performance and operational safety. - In material development, it offers insights into pore structure and the consistency of the manufacturing process. - In the pharmaceutical and food industries, it serves as evidence of membrane integrity and homogeneity. Traditionally, the bubble point is determined using pressure-controlled gas-liquid flow experiments. While well established, these tests are often time-consuming and costly, and they can be affected by measurement uncertainties. For example, due to wetting errors, temperature and surface effects, or incomplete knowledge of the material's internal structure. In addition, experimental methods offer little insight into the local pore-scale mechanisms that trigger the initial gas breakthrough. This is where bubble point simulation comes into play. With GeoDict, the bubble point is simulated accurately and reproducibly, based directly on real 3D microstructural data obtained from µCT images. GeoDict's simulation approach relies on direct numerical simulation of two-phase flow in realistic microstructures, offering several key advantages: - Image-based analysis using real µCT data - Physically accurate modeling of interfacial dynamics - Integration with pore network models for fast evaluations - Automated identification of the largest continuous pore The result is an objective, reproducible, and in-depth bubble point analysis that goes beyond individual measurements to deliver a comprehensive understanding of the underlying physical processes.
