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JournalISSN: 0020-7225

International Journal of Engineering Science 

About: International Journal of Engineering Science is an academic journal. The journal publishes majorly in the area(s): Boundary value problem & Constitutive equation. It has an ISSN identifier of 0020-7225. Over the lifetime, 6572 publication(s) have been published receiving 172866 citation(s).
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Journal ArticleDOI
M. Martynyuk1, Mark Kachanov1, Mark Kachanov2Institutions (2)
Abstract: Estimates of compliance contributions of 2-D cracks of complex shapes (such as multilink zigzags or curved shapes) observed in brittle materials are suggested. The effects of several geometric factors are clarified. The problem of quantitative characterization of density of such cracks (the identification of the crack density parameter, to be used in the effective media models) is addressed. Applications to intergranular cracks is considered.

Journal ArticleDOI
Yue Ma1, Xiaohui Chen1, Lee J. Hosking2, Hai-Sui Yu1  +1 moreInstitutions (3)
Abstract: Modelling of coupled thermal (T), hydro (H), mechanical (M) and chemical (C) processes in geomaterials has attracted attention in the past decades due to many significant contemporary engineering applications such as nuclear waste disposal, carbon capture and storage etc. However, in very-low permeability membrane geomaterials, the couplings between chemical osmosis and thermal osmosis and their consequent influence on temperature, water transport and mechanical deformation remain as a long-lasting challenge due to the gap between geomechanics and geochemistry. This paper extends Mixture Coupling Theory by bridging the chemical-thermal field based on non-equilibrium thermodynamics, and develops a new constitutive THMC fully-coupled model incorporating the interactions between chemical and thermal osmosis. Classic Darcy's law has been fundamentally extended with osmosis as the major driving force of the diffusion process. A simple numerical simulation used for the demonstration purpose has illustrated that the couplings between chemical and thermal osmosis will significantly change the water flow directions, consequently influencing the saturation variation and mechanical deformation.

Journal ArticleDOI
Yang Ju1, Chaodong Xi1, Jiangtao Zheng1, Wenbo Gong1  +3 moreInstitutions (1)
Abstract: Accurate understanding and quantitative characterization of the three-dimensional (3D) immiscible water–oil two-phase displacement process and of the factors that affect this process in porous reservoir rocks are prerequisites for the enhancement of petroleum recovery efficiency. To meet these prerequisites, it is crucial to directly visualize and quantify the pore scale physics and dynamic evolution of the water–oil two-phase displacement behavior. However, engineering activities, such as borehole drilling, reservoir fracturing, and oil recovery, can cause geostress redistribution in petroleum reservoirs and drastically change the 3D pore structures of reservoir rocks. This makes it difficult to apply conventional experimental techniques and analytical models to directly reveal and evaluate the 3D immiscible fluid displacement in reservoir rocks during pore structure deformation. In this study, we used X-ray computed tomography, integrated with triaxial loading techniques, to capture in situ the immiscible water–oil displacement and oil trapping inside 3D pore spaces during the deformation induced by various geostresses. An additive manufacturing or 3D printing (3DP) technology was applied to replicate the transparent models of actual porous rocks, facilitating the representation and quantification of pore space deformation and the dynamic process of water–oil displacement and oil trapping. Pore scale displacement behaviors (including water sweeping, fingering effects, preferential flow paths, and oil trapping) and their evolution and pore structure deformation with varying geostress were directly visualized and quantified. The relationships between the characteristics of the deformed structures, water–oil displacement efficiency, and effective geostress changes were formulated. The results indicate that stress-induced pore structure deformation has an evident impact on the 3D water–oil displacement behavior and efficiency. A comparison of the 2D and 3D water-oil displacement behaviors indicates that the 3D model predicts a more realistic displacement performance, whereas the residual oil saturation is overestimated in a 2D pore system owing to the truncation of pore connectivity in the third dimension. This study provides a method for directly visualizing and quantifying the effects of geostress-induced pore deformation on the 3D water–oil displacement in porous reservoirs; this method can help draft a strategy to enhance petroleum recovery.

Journal ArticleDOI
Abstract: The SARS-CoV-2 virus, which has emerged as a Covid-19 pandemic, has had the most significant impact on people's health, economy, and lifestyle around the world today. In the present study, the SARS-CoV-2 virus is mechanically simulated to obtain its deformation and natural frequencies. The virus under analysis is modeled on a viscoelastic spherical structure. The theory of shell structures in mechanics is used to derive the governing equations. Whereas the virus has nanometric size, using classical theories may give incorrect results. Consequently, the nonlocal elasticity theory is used to consider the effect of interatomic forces on the results. From the mechanical point of view, if a structure vibrates with a natural frequency specific to it, the resonance phenomenon will occur in that structure, leading to its destruction. Therefore, it is possible that the protein chains of SARS-CoV-2 would be destroyed by vibrating it at natural frequencies. Since the mechanical properties of SARS-CoV-2 are not clearly known due to the new emergence of this virus, deformation and natural frequencies are obtained in a specific interval. Researchers could also use this investigation as a pioneering study to find a non-vaccine treatment solution for the SARS-CoV-2 virus and various viruses, including HIV.

Journal ArticleDOI
Yongjun Jian1Institutions (1)
Abstract: In this paper, electrokinetic flow of Newtonian fluids with pressure-dependent viscosity through a nanoslit is investigated. Under the assumption of unidirectional steady flow, taking the dimensionless pressure-viscosity coefficient ɛ as a small parameter, the asymptotic analytical solutions of velocity and pressure up to second order in ɛ, streaming potential and electrokinetic energy conversion (EKEC) efficiency are obtained based on the assumption that the viscosity has a linear dependence on the pressure in a high pressure. It is shown that the pressure-dependent viscosity slightly enhances the streaming potential and electrokinetic power output in smaller electrokinetic width K, which implies that more output electrical energy can be utilized to an external load. The increase of dimensionless pressure-viscosity coefficient could cause a decrease in electrokinetic energy conversion (EKEC) efficiency. However, it could cause an increase in pressure required to drive the flow. Last, within the given parametric regions, the maximum EKEC efficiency for different pressure-viscosity coefficients obtained is about 14% in present analysis.

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