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Environmental Earth Sciences

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01-03-2011 | Original Article

Non-isothermal flow in low permeable porous media: a comparison of Richards’ and two-phase flow approaches

Authors: Wenqing Wang, Jonny Rutqvist, Uwe-Jens Görke, Jens T. Birkholzer, Olaf Kolditz

Published in: Environmental Earth Sciences | Issue 6/2011

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Abstract

The present work compares the performance of two alternative flow models for the simulation of thermal-hydraulic coupled processes in low permeable porous media: non-isothermal Richards’ and two-phase flow concepts. Both models take vaporization processes into account: however, the Richards’ model neglects dynamic pressure variations and bulk flow of the gaseous phase. For the comparison of the two approaches first published, data from a laboratory experiment are studied involving thermally driven moisture flow in a partially saturated bentonite sample. Then a benchmark test of longer-term thermal-hydraulic behavior in the engineered barrier system of a geological nuclear waste repository is analyzed (DECOVALEX project). It was found that both models can be used to reproduce the vaporization process if the intrinsic permeability is relative high. However, when a thermal-hydraulic coupled problem has the same low intrinsic permeability, only the two-phase flow approach provides reasonable results.

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Title: Non-isothermal flow in low permeable porous media: a comparison of Richards’ and two-phase flow approaches
Authors: Wenqing Wang
Jonny Rutqvist
Uwe-Jens Görke
Jens T. Birkholzer
Olaf Kolditz
Publication date: 01-03-2011
Publisher: Springer-Verlag
Published in: Environmental Earth Sciences / Issue 6/2011
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-010-0608-1

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