Elliptic random-walk equation for suspension and tracer transport in porous media |
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Authors: | A.A. Shapiro P.G. Bedrikovetsky |
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Affiliation: | a Center for Phase Equilibria and Separation Processes IVC-SEP, Department of Chemical Engineering, Technical University of Denmark, DTU b. 229, DK 2800 Lyngby, Denmark b Australian School of Petroleum, The University of Adelaide, SA 5005, Australia |
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Abstract: | We propose a new approach to transport of the suspensions and tracers in porous media. The approach is based on a modified version of the continuous time random walk (CTRW) theory. In the framework of this theory we derive an elliptic transport equation. The new equation contains the time and the mixed dispersion terms expressing the dispersion of the particle time steps. The properties of the new equation are studied and the fundamental analytical solutions are obtained. The solution of the pulse injection problem describing a common tracer injection experiment is studied in greater detail. The new theory predicts delay of the maximum of the tracer, compared to the velocity of the flow, while its forward “tail” contains much more particles than in the solution of the classical parabolic (advection-dispersion) equation. This is in agreement with the experimental observations and predictions of the CTRW theory. |
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Keywords: | Tracer Suspension Porous medium Random walk Dispersion |
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