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Macroscale transport in channel-matrix systems via integral transforms

B. Ling, C. B. Rizzo, I. Battiato, and F. P. J. de Barros
Phys. Rev. Fluids 6, 044501 – Published 12 April 2021

Abstract

Flow and transport in coupled channel-matrix systems are ubiquitous to many environmental and engineering applications such as flows in fractured porous media over canopies and in membrane filtration units. The multiscale nature of such systems, where the horizontal length scale is often orders of magnitude larger than the vertical one, allows one to employ vertically averaged descriptions of the system. As a result, two-dimensional transport in the channel and the matrix can be upscaled to a coupled system of transient one-dimensional advection-dispersion equations, where matrix and channel properties can be analytically related to macroscopic transport observables. In this work, we first develop a semianalytical solution based on integral transforms that can be employed to predict macroscopic transport in channel-matrix shear flows in a computationally efficient manner. Then we demonstrate that under appropriate dynamic conditions, the coupled system at the macroscale can be further simplified to a single upscaled one-dimensional advection-dispersion equation, which admits an analytical closed-form solution, thus enabling real-time macroscale concentration estimates in relevant applications.

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  • Received 12 August 2020
  • Accepted 16 March 2021

DOI:https://doi.org/10.1103/PhysRevFluids.6.044501

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

B. Ling1,2, C. B. Rizzo3, I. Battiato2, and F. P. J. de Barros3

  • 1Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Department of Energy Resources Engineering, Stanford University, Stanford, California 94305, USA
  • 3Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, California 90089, USA

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Issue

Vol. 6, Iss. 4 — April 2021

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