Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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 is 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 for both the liquid and the gas phase, only the two-phase flow approach provides reasonable results.
Non-isothermal Flow in Low Permeable Porous Media
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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 is 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 for both the liquid and the gas phase, only the two-phase flow approach provides reasonable results.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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 is 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 for both the liquid and the gas phase, only the two-phase flow approach provides reasonable results.
Contribution to Computational Geotechnics
Author: Joe͏̈lle de Jonge
Publisher:
ISBN:
Category :
Languages : en
Pages : 226
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 226
Book Description
Study of Non-isothermal Flow and Heat Transfer in Porous Media
Author: Bhim S. Singh
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Study of Non-isothermal Flow and Heat Transfer in Porous Media : by Bhim S. Singh
Author: B.S. Singh
Publisher:
ISBN:
Category :
Languages : en
Pages : 147
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 147
Book Description
Studies of Non-isothermal Flow in Saturated and Partially Saturated Porous Media
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Physical and numerical experiments have been performed to investigate the behavior of nonisothermal flow in two-dimensional saturated and partially saturated porous media. The physical experiments were performed to identify non-isothermal flow fields and temperature distributions in fully saturated, half-saturated, and residually saturated two-dimensional porous media with bottom heating and top cooling. Two counter-rotating liquid-phase convective cells were observed to develop in the saturated regions of all three cases. Gas-phase convection was also evidenced in the unsaturated regions of the partially saturated experiments. TOUGH2 numerical simulations of the saturated case were found to be strongly dependent on the assumed boundary conditions of the physical system. Models including heat losses through the boundaries of the test cell produced temperature and flow fields that were in better agreement with the observed temperature and flow fields than models that assumed insulated boundary conditions. A sensitivity analysis also showed that a reduction of the bulk permeability of the porous media in the numerical simulations depressed the effects of convection, flattening the temperature profiles across the test cell.
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Physical and numerical experiments have been performed to investigate the behavior of nonisothermal flow in two-dimensional saturated and partially saturated porous media. The physical experiments were performed to identify non-isothermal flow fields and temperature distributions in fully saturated, half-saturated, and residually saturated two-dimensional porous media with bottom heating and top cooling. Two counter-rotating liquid-phase convective cells were observed to develop in the saturated regions of all three cases. Gas-phase convection was also evidenced in the unsaturated regions of the partially saturated experiments. TOUGH2 numerical simulations of the saturated case were found to be strongly dependent on the assumed boundary conditions of the physical system. Models including heat losses through the boundaries of the test cell produced temperature and flow fields that were in better agreement with the observed temperature and flow fields than models that assumed insulated boundary conditions. A sensitivity analysis also showed that a reduction of the bulk permeability of the porous media in the numerical simulations depressed the effects of convection, flattening the temperature profiles across the test cell.
A Numerical Study of Non-isothermal Reactive Flow in a Dual Scale Porous Media
Author: Rajendra Jadhav
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 150
Book Description
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 150
Book Description
Modeling Non-isothermal Mutiphase-multicomponent Flow and Transport in Porous Media Using the Two Phase Mixture Approach
Author: Emadeddin Y. H. Tanbour
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
Book Description
Non-Darcy flow through porous media
Author: James Edward Bené
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
Book Description
A Decoupled Model for Compositional Non-isothermal Multiphase Flow in Porous Media and Multiphysics Approaches for Two-phase Flow
Author: Jochen Fritz
Publisher:
ISBN: 9783933761965
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN: 9783933761965
Category :
Languages : en
Pages : 0
Book Description
Physical and Mechanical Properties of Rocks
Author: Institut geologii rudnykh mestorozhdeniĭ, petrografii, mineralogii i geokhimii (Akademii︠a︡ nauk SSSR)
Publisher:
ISBN:
Category : Rocks
Languages : en
Pages : 172
Book Description
Publisher:
ISBN:
Category : Rocks
Languages : en
Pages : 172
Book Description