We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Non-isothermal flow in low permeable porous media: a comparison of Richards' and two-phase flow approaches.
- Authors
Wenqing Wang; Rutqvist, Jonny; Görke, Uwe-Jens; Birkholzer, Jens T.; Kolditz, Olaf
- 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.
- Subjects
POROUS materials; HEATS of vaporization; HYDRAULIC measurements; RADIOACTIVE wastes; THERMAL analysis
- Publication
Environmental Earth Sciences, 2011, Vol 62, Issue 6, p1197
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-010-0608-1