Dissolution, in porous media

Kennedy VC, Brown TC (1965) Experiments with a sodium ion electrode as a mean to studying cation exchange rate. Clays Clay Minerals 13 351-352 Khachikian C, Harmon TC (2000) Nonaqueous phase liquid dissolution in porous media Current state of knowledge and research needs. Trans Porous Media 38 3-28 Kookana RS, Aylmore LAG (1993) Retention and release of diquat and paraquat herbicides in soils. Austral J Soil Res 31 97-109... 

A MICROMECHANICS APPROACH TO THE MECHANICALLY-INDUCED DISSOLUTION IN POROUS MEDIA... 

Mechanically-Induced Dissolution in Porous Media The macroscopic strain is E t)6 and reads ... 

Abstract In this paper we discuss a pore scale model for crystal precipitation and dissolution in porous media. We consider weak solutions in general domains and dissol-ution/precipitation fronts in thin strips. The latter yields an upscaled transport-reaction model. 

Experimental Studies of NAPL Pool Dissolution in Porous Media. 125... 

Khachikian C, Harmon TC (2000) Nonaqueous phase liquid dissolution in porous media Current state of knowledge and research needs. Transp Porous Media 38 3-28... 

Bolton EW, Lasaga AC, Rye DM (1996) A model for the kinetic control of quartz dissolution and precipitation in porous media flow with spatially variable permeability Eormulation and examples of thermal convection. J Geophys Res 101 22,157-22,187 Bolton EW, Lasaga AC, Rye DM (1997) Dissolution and precipitation via forced-flux injection in the porous medium with spatially variable permeability Kinetic control in two dimensions. J Geophys Res 102 12,159-12,172... 

Baumann J., Buhmann D., Dreybrodt W. and Schultz H.D. (1985) Calcite dissolution kinetics in porous media. Chem. Geolog. 53, 219-228. 

Johns ML, Gladden LF (1999) Magnetic resonance imaging study of the dissolution kinetics of octanol in porous media. J Colloid Int Sci 210 261-270... 

Analytical Models for NAPL Pool Dissolution and Contaminant Transport in Porous Media... 

Understanding of bulk flow and recovery of oil and solvents in porous media, sub-surface contaminant transport and contaminant dissolution from non-aqueous phase liquids. 

Yasuhara, H., Elsworth, D., Polak, A., Liu, J., Grader, A., and Halleck, P. (2004b) Spontaneous Permeability Switching in Fractures in Carbonate Lumped Parameter Representation of Mechanically- and Chemically-Mediated Dissolution. Submitted for Publication. Transport in Porous Media. 30... 

Under either reducing or oxidizing conditions, the solubilization of arsenic from sulfide phases can be subject to kinetic limitations. Mass transfer constraints, particularly in porous media, can result in localized saturation conditions near the surface of the solid. For oxidative dissolution, depletion of dissolved oxygen may limit dissolution kinetics. Microorganisms may also play a role in catalyzing such oxidative dissolution as has been demonstrated for pyrite oxidation (88) and thus dissolution rates may reflect the level of microbial activity (which may be subject, for example, to nutrient limitation). Thus, although equilibrium calculations indicate solubility constraints on dissolved arsenic concentrations, actual concentrations may be lower than the predicted equilibrium values due to slow dissolution kinetics or greater due to slow precipitation kinetics. 

Imhoff PT, Frizzel A, Miller CT. (1997). Evaluation of thermal effects on the dissolution of a nonaqueous phase liquid in porous media. Environmental Science Technology 31(6) 1615-1622. 

Daccord and Lenormand [36] have shown experimentally that the dissolution patterns obtained by injecting water through pure master were fractal. These results are of interest in different areas where chemical dissolution of porous media by a flowing fluid occurs. In nature, the formation of caves and the oil industry are examples of this process. In two dimensions, these dissolution patterns are remarkably similar to patterns associated with DLA, which includes dielectric breakdown. The two-dimensional dissolution patterns are remarkably similar to patterns associated with DLA. 

Reactive flows are present in a variety of applications, such as premixed and diffusion flames, flow in porous media with and without dissolution, and precipitation of minerals. These flows frequently include a large number of chemical reactions, increasing the computational work to analyze them. 

This section presents the governing equations for fluid flow in porous media with precipitation reactions, dissolution of minerals, and laminar premixed combustion, as well as similarity parameters. The model is based on Navier-Stokes equations. For modeling precipitation and dissolution, we used the Boussinesq approximation and Darcy s law, which wiU not be considered in the case of combustion in porous media. Darcy s law, in general, defines the permeability or the ability of a fluid to flow through a porous medium [29]. Another difference from the model of combustion lies in the equations for species, which are based on concentrations. 

In the following is presented the set of equations for modeUng fluid flow in porous media, where dissolution reactions and/or precipitation of minerals can occur. This set consists of the continuity, momentum, energy, and concentration. The Boussinesq hypothesis is employed to consider the changes in fluid density due to changes in temperature and concentration of the fluid components. 

Influence of transport and reaction on wormhole formation in porous media. AICHE Journal. September 1933-1949. C. N. Fredd and H. S. Fogler. 1998. The influence of chelating agents on the kinetics of calcite dissolution. JWrwi / (f Colloid and Interface Science. 204 187-197. Fredd,... 

The kinetic chemical mass transfer coefficient for dissolution of immobile packets of nonaqueous phase liquids (NAPLs) in porous media is relevant to the subject of pore water leaching of surface soils. Equation 15.8 defines the mass transfer coefficient for NAPL dissolution, used to describe the transfer of chemicals from the immobile phase due to downward percolating porewaters. Much quantitative information on the subject of NAPL leaching in groundwater has been produced in the last two decades and is the subject of Part 2 of Chapter 15 titled Mass Transfer Coefficients in Porewater Adjacent to Nonaqueous Liquids and Particles the following is a review of the contents of that section pertaining to NAPL dissolution in ground water. 

The solubility of contaminants in subsurface water is controlled by (1) the molecular properties of the contaminant, (2) the porous media solid phase composition, and (3) the chemistry of the aqueous solution. The presence of potential cosolvents or other chemicals in water also affects contaminant solubility. A number of relevant examples selected from the literature are presented here to illustrate various solubility and dissolution processes. 

Grathwohl, P. (1998). Diffusion in natural porous media contaminant transport, sorption/desorption and dissolution kinetics, Kluwer Publishers, Boston, MA. 

Abstract When subjected to a mechanical loading, the solid phase of a saturated porous medium undergoes a dissolution due to strain-stress concentration effects along the fluid-solid interface. Through a micromechanical analysis, the mechanical affinity is shown to be the driving force of the local dissolution. For cracked porous media, the elastic free energy is a dominant component of this driving force. This allows to predict dissolution-induced creep in such materials. 

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