Disjoining pressure and the energy of thin films softmatter. The disjoining pressure was defined at mechanical equilibrium by derjaguin and. Spreading of nanofluids driven by the structural disjoining pressure gradient. Structural disjoining pressure induced solid particle. Enhanced oil recovery eor using nanoparticle dispersions. Investigating the application of nano particles for. The first part of this paper addresses studies about the major eor mechanisms of nanoparticles used in the forms of nanofluids, nanoemulsions and nanocatalysts, including disjoining pressure. Disjoining pressure disjoining pressure is defined as the attractive and repulsive forces between two thin layer of fluid surfaces.
However, nanofluid spreading or wetting is enhanced by the structural disjoining pressure because of the ordering of the nanoparticles. This paper presents the results of imbibition tests using a reservoir crude oil and a reservoir brine solution with a high salinity and a suitable nanofluid that displaces crude oil from berea sandstone waterwet and singleglass capillaries. Effect of nanoparticles on spontaneous imbibition of water. The origin of the structural disjoining pressure in a confined geometry is due to the layering. Suppose one had stacked two parallel plates separated by a distance h apart filled with a thin material. Pdf enhanced oil recovery eor driven by nanofilm structural.
Spreading of nanoflulds driven by the structural disjoining pressure. The wetting and spreading of nanofluids composed of liquid suspensions of nanoparticles have significant technological applications. Nanocapillarity and liquid bridgemediated force between. Here, we present our experimental observations and the. Nanofluids comprising nanoparticle suspensions in liquids have significant industrial applications. Wetting and spreading of nanofluids on solid surfaces. Prior work performed in our laboratory on the spreading of a nanofluid on a solid substrate has revealed that the structural disjoining pressure gradient caused by the layering of the nanoparticles normal to the confining plane of the film with the wedge profile is a new mechanism for oily soil.
This paper discusses the role of the structural disjoining pressure exerted by nanoparticles on the spreading of a liquid film containing these particles. Request pdf spreading of nanoflulds driven by the structural disjoining. A positive disjoining pressure \pi corresponds to spreading of the liquid. One physical example of a disjoining pressure helps make this clearer is the case of a surface sandwiched between two parallel plates. This can be achieved by the structural disjoining pressure employed by nanoparticles on the spreading of a liquid film containing these particles on the rock surface 6. Recent studies have revealed that, compared to the spreading of base liquids without nanoparticles, the spreading of wetting nanofluids on solid surfaces is enhanced by the structural disjoining pressure. For two flat and parallel surfaces, the value of the disjoining pressure i. The illinois institute of technology iit nanofluid is specially formulated to survive in a highsalinity environment and is found to result in an. We also differentiate between the disjoining pressure mechanism and diffusion of silica nanoparticles through the oil phase by testing the attachment of. Toward a mechanistic understanding of wettability alteration in. This study provides new insights into the complex interactions between nanoparticles. Pdf nanofluids composed of liquid suspensions of nanoparticles may soon permit. Disjoining pressures that are positive correspond to the adsorbed films. Wetting and spreading of nanofluids on solid surfaces driven by.