scholarly journals Two-Dimensional Modeling of the NAPL Dissolution in Porous Media: Heterogeneities Effects on the Large Scale Permeabilities and Mass Exchange Coefficient

2017 ◽  
Vol 06 (01) ◽  
pp. 56-78
Author(s):  
Bernard Mabiala ◽  
Timothée Nsongo ◽  
Dominique Nkounkou Tomodiatounga ◽  
Christian Tathy ◽  
Dominique Nganga
Keyword(s):  
Porous Media ◽  
Mass Exchange ◽  
Large Scale ◽  
Two Dimensional ◽  
Exchange Coefficient ◽  
Dimensional Modeling ◽  
Napl Dissolution ◽  
Mass Exchange Coefficient

Two-dimensional modeling of microscale transport and biotransformation in porous media

1994 ◽  
Vol 10 (1) ◽  
pp. 65-83 ◽  
Author(s):  
B. Chen ◽  
A. Cunningham ◽  
R. Ewing ◽  
R. Peralta ◽  
E. Visser
Keyword(s):  
Porous Media ◽  
Two Dimensional ◽  
Dimensional Modeling ◽  
Microscale Transport

scholarly journals NAPL Dissolution in a Three Stratified Porous Media: Large Scale Effectives Properties

2010 ◽  
Vol 5 (6) ◽  
pp. 435-446 ◽  
Author(s):  
B. Mabiala ◽  
C. Tathy ◽  
D. Nganga ◽  
U.F. Bouka
Keyword(s):  
Porous Media ◽  
Large Scale ◽  
Napl Dissolution

scholarly journals A Method to Determine Stress-Dependent Filtration Properties of Fractured Porous Rocks by Laboratory Test Data

2019 ◽  
Vol 129 ◽  
pp. 01004
Author(s):  
Larisa Nazarova ◽  
Leonid Nazarov ◽  
Nikita Golikov ◽  
Alexandr Skulkin
Keyword(s):  
Mass Exchange ◽  
Direct Problem ◽  
Input Data ◽  
Fluid Pressure ◽  
Synthetic Data ◽  
Porous Rocks ◽  
Exchange Coefficient ◽  
Dual Porosity Model ◽  
Stress Dependent ◽  
Mass Exchange Coefficient

Within the dual porosity model the authors develop and theoretically, using synthetic data, substantiate the method for determining mass exchange coefficient and stress-dependent permeability of fractured porous reservoir rocks. The proposed filtration test circuit consists of three sequential measurements of flowrate in a specimen subjected to the varied external stress σ at the inlet fluid pressure P: by standard scheme (Q0) and with plugging of fissures at one (Q1) and at the other end (Q2) of the specimen. The model of the experiment is created, and the analytical solution is obtained for the direct problem on steady-state flow: dependences of Q0, Q1 and Q2 on σ and P. The input data are synthesized by superimposition of multiplicative noise on the exact solution of the direct problem. The synthesized data are used to derive the inversion relations for calculating the permeabilities k1 and k2 of fissures and matrix as well as the mass exchange coefficient by Q0, Q1 and Q2. Using LS method, the dependences k1(σ) and k2(σ) are reconstructed. The numerical experiments reveal low stability of inversion by input data. Thus, it is necessary to perform a cycle of measurements at the increasing input pressure with subsequent averaging of the results.

Parameterisation of physically based solute transport models in sandy soils

Soil Research ◽  
2003 ◽  
Vol 41 (4) ◽  
pp. 771 ◽  
Author(s):  
Y. M. Oliver ◽  
K. R. J. Smettem
Keyword(s):  
Solute Transport ◽  
Water Content ◽  
Mass Exchange ◽  
Granular Media ◽  
Sandy Soils ◽  
Exchange Coefficient ◽  
Water Fraction ◽  
Immobile Water ◽  
Mass Exchange Coefficient ◽  
Tracer Experiments

Immobile water fractions of up to 40% had been reported in sands, and it was therefore relevant to determine if the convection-dispersion equation (CDE) or mobile-immobile model (MIM) should be used as the basic physical model for field studies of solute transport in sandy soils. A review of literature data for granular media indicated that for steady state flow, the dispersion coefficient could be estimated from the grain Peclét number and the mass exchange coefficient from the pore water velocity, but the immobile water fraction was poorly predicted from soil properties.In this study, performed on a sandy soil at Moora, Western Australia, the choice of model was determined after analysis of column effluent breakthrough curves (BTC), sequential tracer experiments, and single tracer experiments on the same core. The latter two methods have recently been introduced in an attempt to independently measure some of the MIM parameters (immobile water content and mass transfer exchange coefficient) in situ. Low immobile water content was found in this sand, with very rapid exchange between the mobile and immobile regions. All 3 techniques gave measured immobile water contents around 10%, which was consistent with most literature values for granular media. The single tracer experiment does not give the mass exchange coefficient α (h–1), but α determined by the sequential tracer technique could not be confirmed by the BTC technique due to the wide 95% confidence interval of the fitted parameter. Although the MIM behaviour was minor and inconsistent in the Moora sand, the choice of model may depend on the problem under consideration. For short column experiments, the CDE and MIM produced similar solute transport behaviour. However, for leaching below the root-zone, the MIM is recommended.

Sign in / Sign up

Export Citation Format

Share Document