Fragmentation and coalescence dynamics of non-wetting blobs during immiscible two-phase flows in porous media
Résumé
We study experimentally the dynamics of non-wetting blobs flowing simultaneously with a wetting fluid in a quasi-two-dimensional porous medium consisting of random obstacles. The blobs continuously merge forming larger ones (coalescence) and breakup into smaller ones (fragmentation) leading to an overall dynamic equilibrium between the two processes. We develop a clustering algorithm for the identification of fragmentation and coalescence events that records the size of the blobs prior and immediately after each event from highresolution videos of the immiscible flow experiments. The results provide significant insight
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