Discerning dynamics of wormhole growth at sub-resolution scale using combined Neutron and X-Ray Tomography
The formation of wormholes during the dissolution of porous media is a multi-scale multi-physics phenomenon, coupling flow and transport at the pore-scale to the evolving geometry of the macro-scale features. The dynamics of macro-scale wormhole formation can be captured with sequential X-Ray tomography (XT) imaging, however time-resolution tradeoffs prevent capture of smaller scale dynamics. A previous experiment using neutron tomography (NT) with heavy-light water contrast captured highly focused fluid flow past the tip region of a wormhole, indicating control control by both large-scale heterogeneities within the matrix and microporosity. Additionally, when the flow field is calculated numerically from one XT image in a time series, the wormhole in the following image tracks one flow path. We request three days of beamtime on the D50T instrument to perform several experiments where a sample is acidized to form a wormhole. The dynamics of macro-scale evolution of the wormhole will be captured with XT at a sufficient resolution, with dissolution paused periodically to perform a flow field experiment with NT to verify if flow fields govern the future wormhole growth.
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COOPER Max; BLACH Tomasz; MAGNI silvana; RADLINSKI Andrzej; SZYMCZAK Piotr and TENGATTINI Alessandro. (2020). Discerning dynamics of wormhole growth at sub-resolution scale using combined Neutron and X-Ray Tomography. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-05-14
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