Searched for: subject%3A%22water%255C+saturation%22
(1 - 14 of 14)
document
Li, K. (author)
Naturally fractured reservoirs (NFRs) gain much attention worldwide because they are often encountered in aquifer remediation, CO2 sequestration, and hydrocarbon extraction. In hydrocarbon extraction, however, oil recovery by gas injection in NFRs is usually low, because of poor sweep efficiency. During gas injection, the displacement front is...
doctoral thesis 2022
document
Li, K. (author), Wolf, K.H.A.A. (author), Rossen, W.R. (author)
Foam is applied in enhanced oil recovery to improve the sweep of injected gas and increase oil recovery, by greatly reducing the mobility of gas. In the laboratory, X-ray computed tomography is commonly used to evaluate the performance of foam in core plugs. However, foam properties, such as bubble size and capillary pressure, are much more...
journal article 2022
document
Li, K. (author), Sharifnik, Mohammadamin (author), Wolf, K.H.A.A. (author), Rossen, W.R. (author)
Foam coarsening by diffusion (Ostwald ripening) has been well studied in bulk foams. However, it is less well understood in porous media. In particular, the mechanisms that may slow or stop coarsening have not been fully investigated. In this paper, we report an experimental study of foam coarsening in two 1-m-long and 15-cm-wide model fractures...
journal article 2021
document
Zhang, Y. (author), Ye, G. (author), Yang, Zhengxian (author)
Concrete is rarely saturated. Reliable durability design of marine concrete structures requires a solid understanding of the long-term chloride transport in unsaturated concretes. This paper presents a critical analysis of the time-dependent chloride diffusion coefficient in unsaturated cementitious materials exposed to marine environment....
journal article 2020
document
Zhang, Y. (author), Yang, Zhengxian (author), Ye, G. (author)
Conceptual analysis is performed to examine the effects of pore features on the water continuity in unsaturated porous systems. The roles of pore features in relative chloride diffusion coefficient (D<sub>rc</sub>) of mortar specimens at various degrees of water saturation (S<sub>w</sub>) were studied based on mercury intrusion porosimetry...
journal article 2020
document
Zhang, Y. (author), Ye, G. (author)
An analytical model for predicting the relative chloride diffusion coefficient in cementitious materials at different degrees of water saturation is presented in this paper. The model is developed based on the Nernst-Einstein equation and conductivity of cementitious electrolyte, as well as on moisture distribution in the pore structure. Good...
journal article 2019
document
Zhang, Y. (author)
Chloride-induced reinforcement corrosion, caused by chloride diffusion in the unsaturated concrete cover, is a major durability problem of concrete structures. Current concepts for concrete mixture design and for service life prediction are generally based on the understanding of the chloride diffusion coefficient of saturated concrete. This...
doctoral thesis 2018
document
Zhang, Y. (author), Zhang, M. (author), Ye, G. (author)
Experiments have been carried out to study the influence of moisture condition, including moisture content and its distribution, on the chloride diffusion in partially saturated ordinary Portland cement mortar. The mortar samples with water-to-cement (w/c) ratios of 0.4, 0.5 and 0.6, cured for 1 year, were preconditioned to uniform water...
journal article 2018
document
Zhang, Y. (author), Ye, G. (author)
Experiments are carried out to investigate the chloride diffusivity in partially saturated ordinary Portland cement mortars with water-to-cement (w/c) ratios of 0.4, 0.5 and 0.6. Based on resistivity measurement and Nernst-Einstein equation, the chloride diffusivities of cement mortars at various water saturations are estimated. The pore...
conference paper 2017
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Li, K. (author), Stroeven, P. (author), Stroeven, M. (author), Sluys, L.J. (author)
Permeability of virtual cement seems to exceed experimental data by several orders of magnitude. The differences may actually not be that dramatic, since experimental samples are in practice not always fully saturated as generally assumed. This paper demonstrates that this has enormous effects on permeability. A numerical study is conducted on...
conference paper 2015
document
Li, K. (author), Stroeven, P. (author), Le, L.B.N. (author)
A novel methodology is described for porosimetry as well as for water transport through the pore system in dynamic DEM-based virtual cementitious materials. The pore network topology, the pore size distribution and the pore connectivity are assessed on the basis of a robotics-inspired pore delineation method and star volume measurements....
journal article 2015
document
Chahardowli, M. (author), Bruining, J. (author)
conference paper 2012
document
Latooij, C.A. (author)
A recent study [Rossen et al., 2011] developed a fractional-flow model (an extension of the Buckley-Leverett theory for a waterflood) for non-Newtonian two-phase flow (surfactant solution and gas) around a well. In this fractional-flow model two effects are represented: the decrease in water saturation Sw during gas injection in a SAG process...
bachelor thesis 2012
document
Ahadi, A. (author)
A binary mixture model for soils has been formulated and analyzed. In the model one of the constituents is soil and the other constituent an incompressible liquid. The effects of water are included by formulating a mixture model is formulated as an extension of an existing non-associated elasto-plastic material model for granular materials. This...
conference paper 2006
Searched for: subject%3A%22water%255C+saturation%22
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