To accurately determine the particle transport in porous media at continuum scales requires future research. In a recent paper, revil and linde derived linear constitutive equations of transport for a multicomponent electrolyte saturating a porous material that undergoes reversible deformation. Twodimensional flow through porous media by joe millard bunn a dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of. Results showed that higher particle number concentration led to lower relative. Ionic diffusivity, electrical conductivity, membrane and thermoelectric potentials in colloids and granular porous media.
Geophysical applications of these phenomena could include the use of streaming potentials for mapping subsurface fluid flow, the study of hydrothermal activity of geothermal areas, and in the context of earthquake prediction and volcanic. The seismoelectric method consists of measuring electromagnetic signals associated with the propagation of seismic waves or seismic sources in porous media. This method is useful in an increasing number of applications, for example to characterize aquifers, contaminant plumes or the vadose zone. Analysis of electrokinetic coupling of fluid flow in. Seismoelectric coupling in unsaturated porous media. Deviation of linear relation between streaming potential and. The proposed model is in agreement with available experimental data. This model is coupled with an electrokinetic model accounting for the effect of saturation and in agreement with available experimental data in sands and carbonate rocks. Monitoring microbial sulfate reduction in porous media using. Rice university consortium for processes in porous media.
Frequencydependent streaming potential coefficient measurements have been made upon ottawa sand and glass bead packs using a new apparatus that is based on an electromagnetic drive. A monitoring methodology is developed for investigating seepage and internal erosion in earthen dams with timelapse measurements of self potential anomalies associated with conservative salt and nonconservative heat tracer migration in the subsurface. Modelling phdependent and microstructuredependent streaming. We also compare the predicted streaming potential coupling coefficients with experimental data from four dolomite core samples. We develop microfluidic systems to investigate the fundamentals of twophase flow in porous media. Sensitivity of intrinsic permeability to electrokinetic. Theory of ionicsurface electrical conduction in porous media. The standard procedure for determining the permeability of porous media according to apz code no. How do i calculate the porous media parameters youtube. These threedimensional 3d model systems allow us to fully visualize the multiphase flow, in 3d, at porescale resolution, using confocal microscopy. The pores are typically filled with a fluid liquid or gas.
Apr 01, 2018 in this video, we will talk about how to calculate the porous media coefficients for a simple homogeneous porous media from the experimentally obtained velocity vs pressure loss data. In particular, the electrical conductivity, the streaming potential, and the membrane potential are described in a selfconsistent set of equations. Torquato, random heterogeneous materials springer 2002 d. Read ionic diffusivity, electrical conductivity, membrane and thermoelectric potentials in colloids and granular porous media. This self potential field is associated with the generation of a secondarysource current density. As a result, network modeling seems to be the most viable candidate for modeling yieldstress uids in porous media. The skeletal portion of the material is often called the matrix or frame. A unified model, journal of colloid and interface science on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The presentation is selfcontained, requiring only routine mathematics and the basic elements of fluid mechanics and heat transfer. Influence of the dukhin and reynolds numbers on the apparent. In this paper, we have significantly modified an existing model for calculating the zeta potential and streaming potential coefficient of porous media and tested it with a large, recently published, highquality experimental dataset.
May 17, 2018 in this paper, we have significantly modified an existing model for calculating the zeta potential and streaming potential coefficient of porous media and tested it with a large, recently published, highquality experimental dataset. Induced polarization response of porous media with metallic particles part 9. Porous media and its applications in science, engineering, and industry kambiz vafai 1 oral session 1 transport through porous media i fluid flow and solute transport in unevenlystratified groundwater aquifers. Sep 01, 2012 read a new model for the spectral induced polarization signature of bacterial growth in porous media, water resources research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Stauffer, introduction to percolation theory in electrochemical energy systems, porous electrodes are generally used to maximize interfacial. In this formulation, we also account for the influence of surface conductivity of the grains on both the electrical conductivity and the streaming potential coupling coefficient. Moreover, we instrument these systems to simultaneously image the flow and probe their bulk transport properties. Geoelectric monitoring of seepage in porous media with. The model is derived assuming that the porous media can be represented by a bundle of tortuous capillary tubes with a fractal poresize distribution. Toolbox for upscaling rock and rockfluid parameters. The secondary voltage associated with timedomain induced polarization data of disseminated metallic particles such as pyrite and magnetite in a porous material can be treated as a transient self potential problem. Ionic diffusivity, electrical conductivity, membrane and.
The application of this model to electric potentials generated in porous media by fluid flow is explored in the companion paper. The secondary voltage associated with timedomain induced polarization data of disseminated metallic particles such as pyrite and magnetite in a porous material can be treated as a transient selfpotential problem. Theory and application to geothermal systems 19782012 j. Rather than using the zeta potential, like in conventional theories for the saturated case, the key parameter used here is the quasistatic volumetric charge density of the pore space, which can be directly computed from the quasistatic permeability. A fractal model for streaming potential coefficient in porous media. The relationship between c sat and q v,sat is given by revil and leroy, 2004 c sat. Luong duy thanh, phan van do, nguyen van nghia, nguyen xuan ca. Sep 01, 2019 andre revil, mridul razdan, stephane julien, antoine coperey, feras abdulsamad, ahmad ghorbani, dominique gasquet, ravi sharma, magali rossi.
The results have been analysed using theoretical models that are either i based upon vibrational mechanics. Investigations on factors that affect the fate and transport of nanoparticles nps remain incomplete to date. Electrokinetic coupling in unsaturated porous media unt. Induced polarization response of porous media with metallic. The permeability of porous media to liquids and gases. The wetting phase for the grains iswater and the nonwetting phase is assumed to be an electricallyinsulating viscous fluid. A monitoring methodology is developed for investigating seepage and internal erosion in earthen dams with timelapse measurements of selfpotential anomalies associated with conservative salt and nonconservative heat tracer migration in the subsurface. Most geological materials are porous and the dynamics of flow, deformation, and reactions in porous media control energy and mass transport in many geological and environmental processes. Abstract 1 there is growing interest in the application of electrodebased measurements for monitoring microbial processes in the earth using biogeophysical methods. A physically based model for estimating electrical conductivity of saturated porous media has been developed in this work. A new model for the spectral induced polarization signature.
Transport processes in porous media by selfpotential method. As commonly observed, some fluid flows through the media while some mass of the fluid is stored in the pores present in the media. A physically based model for the electrical conductivity of watersaturated porous media. The helmholtzsmoluchowski hs equation is widely used to determine the apparent zeta potential of porous materials using the streaming potential method. Percolation april 25th, 2011 notes by john casey and mzb references. The newly modified model does not require the imposition of a zeta potential offset but derives its high salinity zeta potential behaviour from stern plane. A porous medium or a porous material is a material containing pores voids. Industrystandard blackoil simulator for stratigraphic and unstructured grids. Flow in porous media experimental soft condensed matter group.
In the present study, we conducted column experiments using 8 and 52 nm silica nps to examine the effects of nps concentration and size on their retention and transport in saturated porous media. Glover department of geology and petroleum geology, university of aberdeen, scotland, united kingdom abstract. Moreover, the results, which are reported only for very simple cases of porous media, cannot be fully assessed. Coupled hydromechanical and electromagnetic disturbances in. The selfpotential method enables nonintrusive assessment and imaging of disturbances in electrical currents of conductive subsurface materials. From surface electrical properties to spontaneous potentials. Read a new model for the spectral induced polarization signature of bacterial growth in porous media, water resources research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. This model accounts for inertial effects and for the polarization of porous materials.
In this video, we will talk about how to calculate the porous media coefficients for a simple homogeneous porous media from the experimentally obtained velocity vs pressure loss data. This paper deals with the electrical double layer and the related properties of porous media. Convection in porous media, 4th edition, provides a userfriendly introduction to the subject, covering a wide range of topics, such as fibrous insulation, geological strata, and catalytic reactors. It has an increasing number of applications, from mapping fluid flow in the subsurface of the earth to detecting preferential flow paths in earth dams and embankments. Heinemann professor for reservoir engineering leoben, october 2005 actualized by dr. The electrokinetic potential or streaming potential is induced by the motion of electrolytic fluids through porous media. We use a volumeaveraging approach to derivethe linear constitutive equations for the electrical current. Analysis of electrokinetic coupling of fluid flow in porous media using a 3d pore network. They used the excess of electrical charge in the pore space to model electrokinetic processes, rather than the zeta potential, as traditionally done by most.
Streaming potential an overview sciencedirect topics. This selfpotential field is associated with the generation of a secondarysource current density. We also developed new scaling laws for the permeability, the streaming potential coupling coefficient and the capillary entry pressure of porous media. The basic characteristic of this medium is porosity. Geophysical journal international 2019, 219 2, 866876. Electrokinetic coupling in unsaturated porous media. A porous medium is a solid with voids distributed more or less uniformly throughout the bulk of the body. Measurements on these samples include electrical conductivity, capillary pressure, the streaming potential coupling coefficient at various level of saturation, and the permeability at saturation of the rock samples. Retention and transport of silica nanoparticles in saturated. Porous media and its applications in science, engineering, and industry fourth international conference table of contents preface. We present a model able to correct this apparent zeta potential of granular media of the influence of the dukhin and reynolds numbers. The apparatus operates in the range 1 hz to 1 khz with samples of 25.
Pezard cnrscerege, department of geophysics, aixenprovence, france p. Streaming current generation in twophase flow conditions. Frequencydependent streaming potential of porous mediapart. Uvadare digital academic repository electrokinetics in. However, the streaming potential in porous media has been reported. In fluid mechanics, fluid flow through porous media is the manner in which fluids behave when flowing through a porous medium, for example sponge or wood, or when filtering water using sand or another porous material.
A unified model, journal of colloid and interface science on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. The principal objective of the open porous media opm initiative is to develop a simulation suite that is capable of modeling industrially and scientifically relevant flow and transport processes in porous media and bridge the gap between the different application areas of porous media modeling, including reservoir mechanics, co 2. The open porous media opm initiative encourages open innovation and reproducible research for modeling and simulation of porous media processes. Porescale modelling of electrical phenomena in porous media. The self potential method enables nonintrusive assessment and imaging of disturbances in electrical currents of conductive subsurface materials. Vadose zone journal original research streaming potential. The skeletal material is usually a solid, but structures like foams are often also usefully analyzed using concept of porous media. We consider a charged porous material that is saturated bytwo fluid phases that are immiscible and continuous on the scale of arepresentative elementary volume. In this study, reactive electrode measurements were combined to electrical geophysical measurements during microbial sulfate reduction occurring in a column of silica beads saturated with natural river water.
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