Article
Geosciences, Multidisciplinary
C. J. Tulley, A. Fagereng, K. Ujiie, S. Piazolo, M. S. Tarling, Y. Mori
Summary: This study reveals the deformation mechanisms and rheological behavior of antigorite, suggesting that dissolution-precipitation creep and dislocation activity contribute to the foliation development of antigorite.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Aerospace
Hui Wu, Weifang Chen, Zhongzheng Jiang
Summary: The velocity slip and temperature jump for a two-dimensional rough plate under hypersonic conditions were analyzed using the DSMC method. The effects of relative roughness height on the slip coefficients were discussed, and a new slip model for rough surfaces was established. The modified slip model improves the accuracy of macroscopic properties, especially the heat transfer coefficient.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Multidisciplinary Sciences
Wei Feng, Lu Yao, Chiara Cornelio, Rodrigo Gomila, Shengli Ma, Chaoqun Yang, Luigi Germinario, Claudio Mazzoli, Giulio Di Toro
Summary: Earthquakes often occur along faults where there is hot and pressurized water. Experimental studies show that the physical state of water (liquid, vapor, or supercritical) has an impact on the frictional resistance of faults. In this study, friction in gabbro faults with water in different states (vapor, liquid, and supercritical) was examined, and it was found that the friction behavior differs depending on the state of the water. The findings suggest that the formation of weak minerals, chemical bonding properties of water, and hydrodynamic lubrication could explain the weakening behavior of faults.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Umair Khan, Aurang Zaib, Iskandar Waini, Anuar Ishak, El-Sayed M. Sherif, Wei-Feng Xia, Noor Muhammad
Summary: Nanofluids and hybrid nanofluids have various applications in medicine and other fields. This study investigated the radiative flow and heat transfer induced by hybrid nanofluid impinging on a porous stretchable/shrinkable rotating disc, considering the effects of temperature and velocity slip. The results showed that the heat transfer rate increased with the addition of hybrid nanoparticles, and the suction parameter enhanced the friction factors and heat transfer rate.
Article
Multidisciplinary Sciences
S. Aretusini, F. Meneghini, E. Spagnuolo, C. W. Harbord, G. Di Toro
Summary: Research indicates that in subduction zones, seismic slip at shallow crustal depths may trigger tsunamis due to the low coseismic shear strength of fluid-saturated and non-lithified clay-rich fault rocks. Experiments show that shear-induced dilatancy and pressurization of fluids occur when these materials are sheared at seismic velocities, reducing the energy required for earthquake rupture propagation. These findings suggest that fluid-saturated clay-rich sediments in subduction zones can promote earthquake rupture propagation and slip due to their low permeability and tendency to pressurize when sheared at seismic slip velocities.
NATURE COMMUNICATIONS
(2021)
Article
Mineralogy
Giancarlo Capitani, Roberto Compagnoni, Roberto Cossio, Serena Botta, Marcello Mellini
Summary: The Monte Fico lizardite crystals exhibit a complex internal skeletal spongy microstructure, with different micrometric domains showing distinct optical reliefs. These features, interpreted as lizardite and chrysotile, are confirmed by TEM analysis, demonstrating tight crystallographic control between the crystals.
EUROPEAN JOURNAL OF MINERALOGY
(2021)
Article
Physics, Fluids & Plasmas
L. Shakurova, E. Kustova
Summary: Boundary conditions for fluid-dynamic variables of strongly nonequilibrium multicomponent gas mixture flows in slip regime are systematically derived by two different approaches. The kinetic boundary condition method provides a more rigorous mathematical description of the problem and can be easily generalized for other scattering kernels and gas-surface interaction models.
Article
Geochemistry & Geophysics
Ken-ichi Hirauchi, Yurina Nagata, Kengo Kataoka, Ryosuke Oyanagi, Atsushi Okamoto, Katsuyoshi Michibayashi
Summary: Episodic tremor and slip events in the forearc mantle wedge of warm subduction zones may be caused by mixed brittle-ductile deformation of serpentinite and high pore fluid pressures. In a study conducted in the Sanbagawa metamorphic belt in SW Japan, it was found that serpentinite experienced multiple extensional and extensional-shear failure events at supralithostatic pore fluid pressures, leading to drops in fluid pressure and formation of a distributed fault-fracture mesh. The presence of antigorite precipitation in fracture openings contributed to an increase in fluid pressure until the failure condition was reached again, controlling the recurrence interval of seismic events.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Thermodynamics
A. A. Avramenko, N. P. Dmitrenko, I. V. Shevchuk
Summary: This paper analyzed the heat transfer characteristics of incompressible steady-state flow in a microconfusor with second-order slip boundary conditions, obtaining novel solutions for velocity and temperature profiles, friction coefficient, and Nusselt number. It was found that an increase in Knudsen number leads to a decrease in Nusselt number. Additionally, the inclusion of second-order terms in boundary conditions significantly affects fluid flow characteristics but does not influence heat transfer characteristics. The study also revealed that the effects of flow slippage on heat transfer weaken with an increase in Prandtl number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Yuewei Ai, Shibo Han, Yachao Yan
Summary: In this study, an interpolation-based transient solidification conditions model is proposed for numerical calculation of grain growth during laser welding. By comparing with previous methods, the accuracy of transient temperature gradient is improved. A phase field model based on the obtained transient solidification conditions is developed to simulate the evolution process of grain growth.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2024)
Article
Mechanics
L. Shakurova, I. Armenise, E. Kustova
Summary: In this study, a new approach to modeling slip boundary conditions in gas mixtures is developed and assessed. The approach considers coupled state-to-state vibrational-chemical kinetics and surface physical and chemical processes. The model is implemented to a fluid-dynamic solver and several test cases are considered. The results show that the proposed model accurately describes vibrational kinetics, rarefaction effects, and surface reactions.
Article
Physics, Multidisciplinary
Fuzhang Wang, Abdulkafi. M. Saeed, V. Puneeth, Nehad Ali Shah, M. Shoaib Anwar, Kamel Geudri, Sayed M. Eldin
Summary: The main objective of this study is to investigate the heat and mass transfer in an Ag-H2O thin film flowing past a stretching sheet with thermal and velocity slips. Various variables including porosity, thermal radiation, thermophoresis, and Brownian motion are taken into account, and the impact of nanoparticle volume fraction is analyzed using a modified Buongiorno model. The results show that an increase in the mixed convection parameter enhances the temperature profile and reduces the velocity profile, while thermophoresis increases both temperature and concentration profiles. Moreover, higher volume fractions of nanoparticles lead to higher temperatures and lower velocities.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Thermodynamics
Wang Jiansheng, Zhuang Yan, Liu Xueling
Summary: The study shows that the miniature cuboid dimples in a rectangular channel can induce protrusion effect, secondary vortex, and local miniature air rolling bearing, leading to drag reduction and slight changes in heat transfer performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Geosciences, Multidisciplinary
Luuk B. Hunfeld, Jianye Chen, Andre R. Niemeijer, Shengli Ma, Christopher J. Spiers
Summary: Experimental research shows that rock materials exhibit dynamic weakening of 22%-81% under high velocities and large displacements, depending on normal stress and soil composition. This weakening may be achieved through thermal pressurization, and similar effects play a key role in induced seismic slip in reservoir systems like Groningen.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Khadija Rafique, Zafar Mahmood, Umar Khan
Summary: There are various real-world uses for hybrid nanofluids, including microfluidics, dynamic sealing, and heat dissipation. The use of hybrid nanofluids in MHD flow over a stretching surface with varying viscosity can enhance heat transfer rates in industries such as electronics cooling, aerospace thermal management, and energy systems. However, further studies are needed to explore the properties of hybrid nanofluids in boundary layer flow and heat transfer rates under different physical assumptions.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Geochemistry & Geophysics
Keishi Okazaki, Eric Burdette, Greg Hirth
Summary: The study investigates the rheology of quartz with different fluid fractions in the brittle-plastic transition zone (BPT) near plate boundaries. Results show that the presence of fluid-filled porosity significantly weakens shear zones, and that variations in fluid fraction (along with temperature) explain transitions in slip behaviors along plate boundaries. The study helps to understand the mechanisms behind large earthquakes and slow slip events occurring along plate boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Editorial Material
Geosciences, Multidisciplinary
Toru Matsuzawa, Ichiko Shimizu, Takuya Nishimura, Christopher J. Spiers, Junichi Nakajima, Tatsuhiko Kawamoto
EARTH PLANETS AND SPACE
(2021)
Article
Geosciences, Multidisciplinary
Kosuke Kurosawa, Hidenori Genda, Shintaro Azuma, Keishi Okazaki
Summary: An accurate understanding of the relationship between impact conditions and shock-induced thermal metamorphism in meteorites is crucial for interpreting the early Solar System's impact environment. Recent hydrocode simulations have shown that post-shock heating from plastic deformation causes higher impact heating than previously believed. By comparing impact simulations and laboratory experiments, researchers found that post-shock heating is significant in natural samples, leading to a reassessment of thermal metamorphism in meteorites.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Ikuo Katayama, Natsue Abe, Keishi Okazaki, Kohei Hatakeyama, Yuya Akamatsu, Katsuyoshi Michibayashi, Marguerite Godard, Peter Kelemen
Summary: By analyzing ultrasonic velocity and matrix conditions, the study examines the geometry of cracks in highly altered peridotites, suggesting a correlation between crack shape and hydration processes, which aids in interpreting the physical properties of the lithosphere.
Article
Geochemistry & Geophysics
Keishi Okazaki, Katsuyoshi Michibayashi, Kohei Hatakeyama, Natsue Abe, Kevin T. M. Johnson, Peter B. Kelemen
Summary: Mineral proportions in listvenite in the Samail ophiolite were quantified using 3D X-ray Computed Tomography (XCT) technology. Dolomite abundance is highest near the base of the listvenite layer, suggesting a source of Ca- and CO2-rich fluids at the paleo-plate boundary. Listvenite may serve as an overlooked reservoir for carbon in the Earth's interior as it shows limited material transfer during carbonation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Kohei Hatakeyama, Ikuo Katayama, Natsue Abe, Keishi Okazaki, Katsuyoshi Michibayashi
Summary: The study investigated the seismic velocity structures of the oceanic lithosphere, finding that alterations and porosity significantly affect the seismic velocity. The research estimated changes in porosity in the oceanic crust and increasing hydration in the mantle, resulting in high water content in the oceanic lithosphere, which has implications for water transport into Earth's interior.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Peter B. Kelemen, Juan Carlos de Obeso, James A. Leong, Marguerite Godard, Keishi Okazaki, Alissa J. Kotowski, Craig E. Manning, Eric T. Ellison, Manuel D. Menzel, Janos L. Urai, Greg Hirth, Matthew Rioux, Daniel F. Stockli, Romain Lafay, Andreas M. Beinlich, Jude A. Coggon, Nehal H. Warsi, Jurg M. Matter, Damon A. H. Teagle, Michelle Harris, Katsuyoshi Michibayashi, Eiichi Takazawa, Zaher Al Sulaimani
Summary: This paper provides an overview of research on the core from Oman Drilling Project Hole BT1B and the surrounding area, and presents new data and calculations to constrain processes in the Tethyan subduction zone beneath the Samail ophiolite. The study reveals the formation of important reservoirs for subducted CO2 in the area and suggests that the processes could lead to aseismic subduction and significant changes in rock mass and volume.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Ichiko Shimizu, Katsuyoshi Michibayashi
Summary: Dynamically recrystallizing quartz has a steady-state microstructure that reflects flow stress in dislocation creep. In a classic experimental study, two types of steady-state microstructures, S and P, were found under different temperature and strain rate conditions. However, the differential stresses did not systematically change with the deformation conditions, and unexpectedly high flow stresses were recorded in some experiments. Internal friction in the sample assembly is a possible cause of the reported high differential stresses. Further experiments suggest that the previous researchers overestimated the differential stress by about 200 MPa.
Article
Geosciences, Multidisciplinary
Kumpei Nagase, Kohei Hatakeyama, Keishi Okazaki, Yuya Akamatsu, Natsue Abe, Katsuyoshi Michibayashi, Ikuo Katayama
Summary: This study presents evidence that the low V-P/V-S in the oceanic crust is caused by epidotization. Quartz precipitation and spheroidal pores in epidosites result in the decrease in V-P/V-S.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Pathikrit Bhattacharya, Allan M. Rubin, Terry E. Tullis, Nicholas M. Beeler, Keishi Okazaki
Summary: A study found that frictional strengthening is primarily slip-dependent rather than solely dependent on time-dependent increase in contact area. This has important implications for the development of constitutive models for friction.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Yohan Park, Shintaro Azuma, Keishi Okazaki, Kentaro Uesugi, Masahiro Yasutake, Yu Nishihara, Ryuichi Nomura
Summary: The seismic anisotropy in Earth's lowermost mantle (D '' layer) is likely caused by the lattice-preferred orientation (LPO) induced by plastic deformation in mantle materials. Ferropericlase, as the second most abundant mineral in the lower mantle, may contribute significantly to the observed seismic anisotropy in the D '' layer. Our experiments show that {100}<011> is the dominant slip system in the D '' layer.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Zhiqiang Lu, Ichiko Shimizu, Tetsumaru Itaya
Summary: In this study, K-Ar dating was conducted on weakly metamorphosed sedimentary rocks collected from the Kanto Mountains in Central Japan to determine the metamorphic ages of the accretionary complexes in the Northern Chichibu Belt in SW Japan. The results revealed variations in the ages of chert and red shale compared to mudstone and tuff in the same strata, possibly due to the influence of submarine hydrothermal activities. The mineral ages of illite samples with different grain sizes indicated older ages and higher crystallinity for larger grain-size classes. The peak metamorphic ages of different units within the accretionary complexes were determined, suggesting a major structural discontinuity in the Middle Jurassic accretionary complexes.
Article
Geochemistry & Geophysics
Y. Akamatsu, I. Katayama, K. Okazaki, K. Michibayashi
Summary: To assess the paleo-permeability structure of the oceanic crust, 3-D X-ray Computed Tomography (XCT) images were used to quantify the distribution and geometry of mineral veins in core samples from Oman Drilling Project Holes GT1A, GT2A, and GT3A. A new method was developed to automatically detect veins in the XCT core images. The study found that high-temperature and low-temperature vein systems have different depth dependencies and anisotropies of permeability.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Astronomy & Astrophysics
Naotaka Tomioka, Akira Yamaguchi, Motoo Ito, Masayuki Uesugi, Naoya Imae, Naoki Shirai, Takuji Ohigashi, Makoto Kimura, Ming-Chang Liu, Richard C. Greenwood, Kentaro Uesugi, Aiko Nakato, Kasumi Yogata, Hayato Yuzawa, Yu Kodama, Kaori Hirahara, Ikuya Sakurai, Ikuo Okada, Yuzuru Karouji, Keishi Okazaki, Kosuke Kurosawa, Takaaki Noguchi, Akira Miyake, Masaaki Miyahara, Yusuke Seto, Toru Matsumoto, Yohei Igami, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Masahiro Nishimura, Toru Yada, Masanao Abe, Tomohiro Usui, Sei-ichiro Watanabe, Yuichi Tsuda
Summary: Scientists have observed mild shock metamorphism in surface particles of asteroid Ryugu using electron microscopy, indicating that the average peak pressure was approximately 2 GPa. These findings are inconsistent with current micrometeorite production models and suggest the need for a new formation mechanism.
Article
Geochemistry & Geophysics
Koji Masuda
Summary: Open cracks and cavities in underground rocks play important roles in fluid transport, with underground water penetration inducing microcrack activity affecting earthquake generation mechanisms. A laboratory method has been demonstrated for estimating the crack status inside a cylindrical rock sample, showing potential for well-planned observations in field experiments and in situ monitoring of cracks in rock for industrial and scientific applications.
PURE AND APPLIED GEOPHYSICS
(2021)