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Time-of-Flight Distributions and Breakthrough Curves in Heterogeneous Porous Media Using a Pore-Scale Streamline Tracing Algorithm.
- Source :
- Transport in Porous Media; Sep2015, Vol. 109 Issue 2, p317-336, 20p
- Publication Year :
- 2015
-
Abstract
- X-ray microtomography is routinely used to image the three-dimensional pore space of sedimentary rocks. Flow and transport properties can then be simulated directly in such images. Advective transport in porous media is frequently simulated using streamlines. We present a novel streamline tracing algorithm based on a substantial development of the most widely used method (the Pollock algorithm) employed for macroscale (Darcy) flow, making it consistent with solutions of the Navier-Stokes equation with no flow at solid boundaries. We use this new algorithm to calculate breakthrough curves and time-of-flight distributions for advection-dominated transport in two three-dimensional images of sedimentary rocks containing up to $$10^9$$ voxels: a sandstone and a carbonate. We show that our approach provides a more accurate description of flow, particularly when only a few image voxels span each pore. Therefore, it is better suited to capture anomalous (non-Fickian) transport behaviour than the standard Pollock method. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01693913
- Volume :
- 109
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Transport in Porous Media
- Publication Type :
- Academic Journal
- Accession number :
- 108952061
- Full Text :
- https://doi.org/10.1007/s11242-015-0520-y