The establishment of the effect of surface wettability of particles on bubble attachment and particle floatability was among the major developments in the theory of flotation. For smaller systems with wetting films, where the disjoining pressure is introduced, the pressure of the condensed phase does not remain uniform. Effect of disjoining pressure on surface nanobubbles. The surface forces are expressed as a disjoining pressure isotherm, and its integral is the specific interaction potential isotherm. A recent book by schwab 114 has vividly captured the impact of the fourth industrial revolution where major technological developments across industries are driven by innovations in manufacturing, 115 robotics, 116 sensors, 117 electronics, power, and materials. Disjoining pressure an overview sciencedirect topics. A disjoining pressure \pi describes the supplementary pressure that arises when the hydrostatic pressure of a thin layer differs from the pressure of a bulk phase.
Apr 05, 2011 wetting and spreading of nanofluids on solid surfaces driven by the structural disjoining pressure. The effects of wettability and surface morphology on heat transfer for zinc oxide nanostructured aluminum surfaces. Although the bubble shape slightly deviates from the classical one defined by the young contact angle, it preserves a nearly sphericalcap shape. Dynamic contact line with disjoining pressure, large capillary numbers, large angles and prewetted, precursor, or entrained films. Wettability of substrates is characterized by a contact angle. The main purpose is to provide the definition and the explanation of local dissipation in nanofluid dynamic wetting due to the nanoparticle selfassembly. The effects of wettability and surface morphology on heat. Pressure in thin liquid films thickness usually less than 10 m is different from the pressure in the bulk liquid. In this chapter, the dynamic wetting of nanofluid droplets is examined using molecular dynamics simulations. Wetting and spreading of nanofluids on solid surfaces driven by the structural disjoining pressure.
Reservoir wettability is not a simply defined property. Molecules free fulltext direct evidence of salinity and. Wettability refers to the interaction between fluid and solid phases. Describes approaches to improving the understanding of the fundamentals of displacement, with the goal of simplifying systems sufficiently to enable measurements and. Finally, the adsorptionpressure number ap takes into account the dependence of the disjoin. Influence of the disjoining pressure on the equilibrium interfacial.
In gasoversaturated solutions, stable surface nanobubbles can exist thanks to a balance between the laplace pressure and the gas overpressure, provided the contact line of the bubble is pinned. The prediction of wettability of curved surfaces on the basis of the isotherms of the disjoining pressure article in colloids and surfaces a physicochemical and engineering aspects 3831. Disjoining pressure in partial wetting at nanoscale request pdf. As we see, in the case of the glycerol on stainless steel the strength of the disjoining pressure appears to be two times higher than that for glycerol on mica system. Particlesurface capillary forces with disjoining pressure. Icephobicity from ice and greek phobos fear is the ability of a solid surface to repel ice or prevent ice formation due to a certain topographical structure of the surface. More importantly, the disjoining pressure theory proposes that by removing water, the overall force balance between opposing surfaces becomes attractive, causing the solid body to contract. The wettability of oil reservoirs is the most important factor controlling the rate of oil recovery, providing a profound effect on petroleum production. The characterization of wettability of substrates by. Evaluation of dlvo theory with disjoiningpressure and film. Contact angles, capillary pressure, and wettability. An example of a situation that involves disjoining pressure in micropassages is shown in fig. Wetting and spreading of nanofluids on solid surfaces. Wettability alteration of caprock minerals by carbon dioxide.
Nanotechnology research and development in upstream oil. In a uniformly wetted porous medium, pore geometry effects and the extremely rough surfaces of the porous medium make the capillary pressure curve insensitive to wettability for small contact angles less than about 50 deg. Positive disjoining pressure means repulsive forces between asphaltene and silica in the brine, suggesting a relatively waterwet system, whereas negative disjoining pressure means attractive forces between asphaltene and silica in the brine, implying a relatively oilwet system. Deals with specialized but interrelated problems in oil recovery in which the effect of interfacial behaviors is the dominant factor. The experimental results demonstrate explicitly, for the first time with microscopic detail, that the disjoining pressure controls fluid flow. Table 1 summarizes the results obtained in the studies described in sections 4 ac 54 56, for the parameters p 0. The word icephobic was used for the first time at least in 1950. Small drops of three liquids mercury, oil, and waterare placed on a clean glass plate. Disjoining pressure is a phenomenon that occurs in thin liquid films israelachvilli, 1992. Some of the wettability applications include superhydrophobic surfaces, dynamics. Classificationof reservoirs as waterwet or oilwet is a gross oversimplification.
Applicability of the simple formula developed by derjaguin, which relates to the contact angle and disjoining pressure to nanoscale liquid droplets is reconsidered within the framework of the theory of. Contact angle, wettability and adhesion, volume 2 book. Gui lu this phd thesis presents the latest research findings on nanofluid wetting kinetics, which has wide applications in nanomicroscale processes and devices. Correlation between important surface properties such as wettability, adsorption, and contact angle and. Proceedings of the asme 2017 heat transfer summer conference. Graphene, the ultimate thin material, is composed of a single sheet of graphite, and is currently one of the most. It was also determined that the wettability of minerals in water. This surface modification generated a strong negative disjoining pressure due to structural forces arising from the orientation of oleic acid. Two methods ofquantifying wettability based on rockbrineoil displacement behavior, themodified amott test and the usbm test, are in common use. Generally, the capillary pressure displacement is done by centrifuging, but other capillary displacement techniques can be used. The wetting of mineral surfaces by water and oil is described by models of surface forces that become. Jun 15, 2003 classical colloidal theory, derjaguin, landau, verwey, and overbeek dlvo theory, is tested rigorously over a wide range of solution conditions by comparing the surface charge densities fit to disjoining pressure isotherms with those estimated independently from filmconductance and surfacetension data.
We also find that the disjoining pressure restricts the aspect ratio sizeheight of the bubble and derive the maximal possible aspect ratio, which is expressed via the young angle. Predicting the wettability of quartz surfaces exposed to. An overview of the oilbrine interfacial behavior and a. Disjoining pressure is a phenomenon that occurs in thin liquid films. Wettability is defined by the contact angle of the fluid with the solid phase. The oil industry has increased the research effort on wettability but so far there has never been a comprehensive book on the topic. The concept of wettability is illustrated in figure1. Capillary pressure reduction and disjoining pressure enhancement are the key contributors to this positive effect on the wettability with the cnd. Sun, role of electrostatic interactions in disjoining pressure of water thin films on nanostructured alumina substrates, asme 2014 international mechanical engineering congress and exposition at montreal, canada, 2014, imece201438773.
This book chronicles the proceedings of the symposium on contact angle, wettability and adhesion held in honor of professor robert j. In addition, the magnitude of structure disjoining pressure is compared with the unbalanced youngs stress acting at the contact line in the second part to examine the effects of structural. Effect of disjoining pressure and working fluid on multi. Disjoining pressure in partial wetting on the nanoscale langmuir. Classical colloidal theory, derjaguin, landau, verwey, and overbeek dlvo theory, is tested rigorously over a wide range of solution conditions by comparing the surface charge densities fit to disjoiningpressure isotherms with those estimated. Wetting and spreading of nanofluids on solid surfaces driven. Remarkable technical developments, based on carbons ability to bind to itself in a variety of hybridized states, have seen the emergence of synthetic carbons with exotic and exceptional properties, e. More recently, the addition of nanoparticles to conventional eor chemicals have been studied and reported to yield novel materials with excellent and fascinating properties. Price new from used from unknown binding, 1998 please retry.
Wettability alteration in carbonate reservoirs by carbon. The surface forces are expressed as a disjoining pressure isotherm. The isotherm equals iieq at three thicknesses, hi, h2 and heq. The prediction of wettability of curved surfaces on the. Effect of the adsorption component of the disjoining. Kashmiri lal mittal was employed by the ibm corporation from 1972 through 1993.
To determine the effect of the adsorption disjoining pressure. Antiicing properties may depend on such circumstances as whether the solid surface is colder than the airvapor, how big is the temperature gradient, and whether a thin film of water tends to form on the solid surface due to capillary effects, disjoining pressure, etc. The partial wetting at nanoscale may result in formation of sessile liquid nanodroplets on flat substrates. In addition, a newlyproposed theory of the structural disjoining pressure sdp has become popular in the scientific community as well. This force over the area of the film is the disjoining pressure. The position of the transition zone depends on the contact angle value. For the ph regime associated with a positive pressure barrier, the quartz surface was predicted to be water wetting. Nanocapillarity and liquid bridgemediated force between. Doi link for contact angle, wettability and adhesion, volume 2. Experimental determination of the effect of disjoining. Effect of antifoaming agents on the micellar stability and.
Molecules free fulltext direct evidence of salinity. The model has been qualitatively verified on samples of differing wettability produced by uvozone treatment of polystyrene ps. Applicability of the simple formula developed by derjaguin, which relates to the contact angle and disjoining pressure to nanoscale liquid droplets is reconsidered within the framework of the theory of the firstorder wetting transition of volatile liquids. Interfacial phenomena in petroleum recovery norman r. Start reading advances in contact angle, wettability and adhesion on your kindle in under a minute. We use cookies to give you the best possible experience. This investigation introduces the asymptotic contact angle as a criterion to quantify the surface wettability of nanofluids and determines the variation of solid surface tensions with nanofluid concentration and nanoparticle size. In this case, the molecular forces generate a strong interaction between nanodroplet. Changes in the wettability of cores have been shown to affect electrical properties, capillary pressure, waterflood behavior, relative permeability, dispersion, simulated tertiary. Apr 29, 2019 the mechanism of the improved oil recovery were identified as structural disjoining pressure, wettability alteration, ift reduction and improved viscosity of injectant. Amir faghri, yuwen zhang, in transport phenomena in multiphase systems, 2006.
Crains petrophysical handbook wettability of porous rocks. Contact angle, wettability and adhesion, volume 2 taylor. Entry in the iupac compendium of chemical terminology the gold book, the international union of pure. The prediction of wettability of curved surfaces on the basis. The mechanism of the improved oil recovery were identified as structural disjoining pressure, wettability alteration, ift reduction and improved viscosity of injectant.
Boundary tension and wettability wettability wettability is defined as the tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids. Jul 30, 2014 this volume documents the proceedings of the second international symposium on contact angle, wettability and adhesion held in newark, nj, june 2123, 2000. Our results show that the ph increase during lowsalinity waterflooding in carbonate reservoirs would lift off nonpolar components, thereby lowering residual oil saturation. Wettability alteration of caprock minerals by carbon. Effect of the adsorption component of the disjoining pressure. The negative values of the disjoining pressure, resulting from these potential energies, are. Help us write another book on this subject and reach those readers. The book opens with a description of the professional and personal life of professor good, followed by 62 papers divided into four parts. Particlesurface capillary forces with disjoining pressure physical. As the pressure of oil rises compared to that in the water phase, the water film tends to thin further and the oilwater curvature tends to go to zero. Since the first symposium, held in 1992, there had been tremendous research activity on many ramifications of wettability phenomena. Table of contents for liquidvapor phasechange phenomena. Mechanical properties of ice and the substrate also of great importance. He has received numerous awards and honors including the title of doctor honoris causa from maria curiesklodowska university, lublin, poland.
This difference is caused by the action of additional forces, which are referred to as surface or colloidal forces. In this ensuing technological revolution, one can have little doubt that. It is controlled by the brineco 2 interfacial tension, the water. When ultrathin liquid films are in contact with a solid surface, there is attraction between the liquid molecules and the solid molecules. Variousprocedures for measuring wettability have been proposed. This volume contains a total of 33 papers, which were all pro. These potential energies give a negative disjoining pressure of 0. Evaluation of dlvo theory with disjoiningpressure and. This pressure may have either positive or negative values. Effect of antifoaming agents on the micellar stability and foamability of sodium dodecyl sulfate solutions b.
This is the first book to go through all of the major research and applications on wettability, capillary pressure and improved recovery. Wettability w of the sample is determined by comparing the log of the area a 1 under the oildisplacing brine curve with the log of the area a 2 under the brinedisplacing oil curve. Get your kindle here, or download a free kindle reading app. This potential can be expressed in terms of the maximum reservoir overpressure that the brine. The disjoining pressure between the quartzwater and a waterdnapl interface as a function of their separation was calculated from a full solution of the nonlinear poisson.
These factors allow characterization of the surface wettability by the disjoining pressure isotherm acquisition fig. The profile shape is determined by joint action of disjoining and capillary pressures. In a reservoir rock the liquid phase can be water or oil or gas, and the solid phase is the rock mineral assemblage. The asymptotic contact angle, which is only a function of gas. Our results show that the ph increase during lowsalinity waterflooding in carbonate reservoirs would lift off nonpolar components, thereby lowering residual oil. For two flat and parallel surfaces, the value of the disjoining pressure i. The deeper region a carries most of the liquid while region b carries a thin film flow with a thickness most of the interface region a is flat and separates the deeper. Disjoining pressure in partial wetting at nanoscale.
A negative pressure sensing setup for capillary pressure test was designed and used for testing the capillary pressure of cementbased materials, cement pastes of watercement ratio 0. He is the editor of more than 110 books dealing with adhesion. Disjoining pressure and the canonical potential hydrogen bonding. Disjoining pressure and the energy of thin films softmatter. Nanofluid surface wettability through asymptotic contact. The specific interaction potential isotherm can be used to determine the stable and metastable filmthickness profiles at the threephase contact region for a given capillary pressure andor curvature of the. Several examples of the wetting phenomena using the concept of disjoining pressure presented earlier indicate that the theory of wetting based on the analysis of surface forces is a useful and powerful tool for the analysis of different surface phenomena, as confirmed by various applications i. Donaldson, 9781933762296, available at book depository with free delivery worldwide. Wettability and its effect on oil recovery onepetro. Nanotechnology research and development in upstream oil and.
Carey and wemhoff 2005 analyzed the effects of disjoining pressure in ultrathin layers and films, as discussed below. The petroleum industry has increased the research effort on wettability, but, so far, there has never been a comprehensive book on the topic. Oct 29, 2019 a recent book by schwab 114 has vividly captured the impact of the fourth industrial revolution where major technological developments across industries are driven by innovations in manufacturing, 115 robotics, 116 sensors, 117 electronics, power, and materials. The characterization of wettability of substrates by liquid. The profiles give fundamental insight into the phenomena of phase change, pressure gradient, fluid flow, spreading, shear stress, and the physics of interfacial phenomena in the contact line region. Disjoining pressure and wettability unknown binding january 1, 1998 by p neogi author see all formats and editions hide other formats and editions. Nguyen2 and roumen tsekov1 1department of physical chemistry, university of sofia, 1164 sofia, bulgaria 2department of chemical engineering, university of queensland, brisbane, qld 4072, australia. A unique set of functionalities that included colloidal stability, mobility, scalability, ease of synthesis, biocompatibility, water solubility, and inherent fluorescence and high detectability. This paper is the fourth in a series of literature surveys covering the effects of wettability on core analysis. The total disjoining pressure and results of afm adhesion tests predict the same trend, showing that adhesion forces decrease with increasing ph. Good at the american chemical society meeting in san francisco, 610 april 1992.