Abstract
Lagrangian theories of flow and transport in porous media are largely unverified experimentally. The flow field inside a porous medium is three-dimensional (3D) and so a 3D imaging technique has to be adopted to detect tracer particle movements. We present an application of “scanning” 3D-PVT with two cameras whos optical axes are orthogonal and coplanar. Matched index (of refraction) porous media have been constructed and different mean flow rates applied. From the reconstructed trajectories we compute velocity distributions, mean square displacements, velocity correlation coefficients and classical dispersion tensors. In the porous media we have found that the velocity correlations are longer range in the heterogeneous systems.
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