Assessment of In-Line Particle Image Velocimetry for Turbulence Measurements in Porous Media

In-line particle image velocimetry (PIV) is implemented and assessed as a measurement technique for acquiring instantaneous velocity fields within porous structures traversed by turbulent flows. Focusing on triply periodic minimal surface samples, whose geometries are analytically defined, this study evaluates the potential of in-line PIV to maximize optical accessibility relative to conventional light-sheet PIV configurations, while maintaining acceptable particle-image quality despite the unavoidable presence of light-scattering solid surfaces. The primary objective is to assess the feasibility and limitations of in-line PIV when applied through a solid porous matrix, and to identify the methodological adaptations required to obtain reliable velocity fields. This methodological groundwork aims to establish in-line PIV as a robust diagnostic tool for future investigations of turbulent flows within porous media.