Article
Geosciences, Multidisciplinary
Youzheng Qi, Yuxin Wu
Summary: The conduction mechanism of clayey rocks and soils is influenced by variations in the electrical double layer and the intrinsic clay-and-water conduction pattern, resulting in a non-linear feature. By applying effective medium theory, an easy-to-use non-linear model has been developed that reflects electrochemical theories and explains measurement data well.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Vladimir A. Lekhov, Sergey P. Pozdniakov, Kamil Nesetril
Summary: Diffusion coefficients for Na+ were measured in low-permeability samples from the deep disposal site of SCC using end-diffusion technique. The results showed a nonlinear decrease in tortuosity with decreasing porosity, and the measured diffusion coefficients were consistent with pore-scale diffusion simulation of microtomography data.
JOURNAL OF CONTAMINANT HYDROLOGY
(2021)
Article
Geochemistry & Geophysics
Xi Chen, Ying Zhou
Summary: Various methods have been developed to extract primary seawater Sr isotope signals from carbonate rocks, but there is little consensus on the best method due to variations in sample purity and mineralogy. This study used sequential leaching to extract the strontium isotope ratios from argillaceous and dolomitic limestone samples. The results showed that a dilute acetic acid leach was the most effective method, extracting the least altered seawater Sr-87/Sr-86 isotope ratios. The new dissolution method significantly improves the chances of obtaining primary seawater Sr-87/Sr-86 isotope ratios from these limestone samples.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Morteza Sistan, Mohammad Hossein Ghazanfari, Saeid Jamshidi
Summary: In this research, a new diffusion mechanism called double cross-phase diffusion is introduced to simulate non-equilibrium gas injection into fractured rocks. The results show that the model's prediction of oil recovery is significantly different when the double cross-phase diffusion mechanism is considered, highlighting its importance in accelerating CO2 diffusion into crude oil and increasing oil recovery.
Article
Engineering, Petroleum
Faruk Civan
Summary: The effective-stress coefficients of porous-rock formations vary due to different rock properties affected by physical mechanisms of rock deformation. Shock effect and hysteresis are observed in fractured-rock formations and heterogeneous porous rocks, respectively, during loading/unloading processes. A modified power-law equation provides a better correlation for the Biot-Willis coefficient compared to the semilogarithmic and basic power-law equations, offering a full range of applicability and more accurate experimental data matching.
Article
Construction & Building Technology
Alireza Kaboudan, Mahmood Naderi, Majid Amin Afshar
Summary: This study investigated the validity of the Darcy flow model for water penetration into concrete, using a two-dimensional diffusion flow model to predict water penetration. Results showed that water penetration did not follow a Darcy flow model, but could be accurately predicted using optimum diffusion coefficients. Strong correlations were found between permeability parameters, test duration, applied water pressure, and weak correlations between diffusion coefficients and penetrated water volume.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Physics, Applied
P. E. Martinez-Munoz, H. D. Martinez-Hernandez, C. F. Rojas-Beltran, J. L. Perez-Ospina, M. E. Rodriguez-Garcia
Summary: This paper focuses on the development of a methodology and metrology using a differential photoacoustic system to determine the effective water vapor diffusion coefficient and permeability coefficient in thin films. Experimental measurements were conducted to obtain the numerical values of these coefficients for different materials.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Energy & Fuels
Evgenii Vasilevich Kozhevnikov, Mikhail Sergeevich Turbakov, Evgenii Pavlovich Riabokon, Vladimir Valerevich Poplygin
Summary: The study revealed a significant decrease in permeability with an increase in effective pressure in oil and gas field development. By analyzing existing methods for describing rock permeability changes, it is possible to predict the changes in permeability of terrigenous reservoirs in the north Perm region oil fields.
Article
Engineering, Civil
Lingdong Meng, Lijun Han, Hexuan Zhu, Wenlong Dong, Wei Li
Summary: This paper investigates the weakly cemented argillaceous rock masses commonly found in coal mine areas. The study focuses on the slurry diffusion mechanism, grouting reinforcement characteristics, and their relationship with compaction and splitting grouting. The research shows that the grouting mode is dominated by compaction and splitting, and the rheological behavior of cement slurries has a significant effect on splitting grouting.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Engineering, Chemical
Alexander Tarasenko
Summary: This study investigates the diffusion process in a binary mixture of species coadsorbed on a multisite square lattice. The diffusion equations are derived to describe the evolution of small hydrodynamic fluctuations of the molecule coverages. The Fickian diffusivities and Onsager phenomenological coefficients are expressed in analytical expressions, revealing the diffusion behavior in this complex system.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Peter A. Knudsen, Kristine Niss, Nicholas P. Bailey
Summary: Experimental results on the structure of the ionic liquid show invariance along curves of equal electrical conductivity, with some variation with temperature. A study using molecular dynamics simulations indicates that there is substantial invariance of structure and dynamics along configurational adiabats, referred to as isodynes, within a certain density range.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Thermodynamics
Francisco E. Berger Bioucas, Thomas M. Koller, Andreas P. Froeba
Summary: This study investigates the influence of the concentration and morphology of dispersed micelles on the effective thermal conductivity of reverse microemulsions. Experimental measurements were conducted using a steady-state parallel-plate instrument, and the results show that the effective thermal conductivity increases with increasing volume fraction of dispersed water micelles. The increase in thermal conductivity is accompanied by an increase in effective viscosity and a decrease in translational particle diffusion coefficients. An average of a serial and a parallel resistance model can accurately represent the effective thermal conductivity of microemulsions in different states.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Fluids & Plasmas
S. A. Khrapak, A. G. Khrapak
Summary: The study shows that the reduced transport coefficients of Lennard-Jones fluids along isotherms exhibit quasi-universal scaling on the density divided by its value at the freezing point. This scaling is closely related to the density scaling of transport coefficients of hard-sphere fluids. Additionally, the Stokes-Einstein relation without the hydrodynamic diameter is valid in the dense fluid regime, with the lower density boundary of its validity serving as a practical demarcation line between gaslike and liquidlike regimes.
Article
Engineering, Petroleum
Xuanqing Lou, Nirjhor Chakraborty, Zuleima T. Karpyn, Luis F. Ayala, Narayana Nagarajan, Zein Wijaya
Summary: The study proposes an experimental methodology to measure diffusion of gas in crude oil within porous rock and reveals significant hindrance to diffusion in porous media compared to bulk oil. Diffusion coefficients in limestone and Bakken Shale samples are one to two orders of magnitude lower than in bulk oil, showing tortuosity has a more significant impact on effective diffusion coefficient than initial pressure.
Article
Chemistry, Physical
C. Lalnuntluanga, Ruchi Shrivastava, R. Lalneihpuii, Raj Kumar Mishra
Summary: We demonstrate the atomic-level structural properties of liquid Cu-In alloy and investigate its transport coefficients and thermodynamic properties. The results are in good agreement with experimental data and reveal some important phenomena in liquid Cu-In alloys.
JOURNAL OF MOLECULAR LIQUIDS
(2022)