Article
Engineering, Environmental
Jingwei Gao, Lifeng Fan, Yan Xi, Xiuli Du
Summary: This study investigated the effects of cooling thermal shock on the P-wave velocity of granite and analyzed its microstructure. The results showed that cooling thermal shock induced the generation and development of microcracks, leading to a significant decrease in the P-wave velocity. The influences of the three cooling thermal shocks on the damage of granite varied, with the differences decreasing as the heating temperature increased.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
Amin Jamshidi
Summary: This study investigates the anisotropy effects on the P (Vp) and S (Vs) wave velocities in laminated sandstone subjected to freeze-thaw (FT) and salt crystallization (SC) processes. The results indicate that anisotropy is an important factor in the durability of the specimens against FT and SC, with the least and the highest changes in Vp and Vs observed in specimens with beta = 0 degrees and beta = 60 degrees, respectively. Additionally, it is found that the anisotropic behavior is intensified at higher cycles of FT and SC. Overall, SC has more significant effects on Vp and Vs compared to FT, with the effect of a single cycle of the SC test corresponding to 1.34 to 1.94 and 1.28 to 1.70 cycles of the FT test in decreasing Vp and Vs, respectively.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Matthaeus Irl, Christopher Schifflechner, Christoph Wieland, Hartmut Spliethoff
Summary: Geothermal Organic Rankine Cycle (ORC) power plants have great potential, but monitoring them is challenging. This paper presents a novel analytical and data-based method for monitoring the main components of a geothermal ORC system in Southern Germany. The results show that most components have no significant negative changes in performance, except for one turbine which experienced a clear performance reduction.
Article
Engineering, Geological
Jinyuan Zhang, Yanjun Shen, Gengshe Yang, Huan Zhang, Yongzhi Wang, Xin Hou, Qiang Sun, Guoyu Li
Summary: The changes in UCS and P-wave velocity of sandstone with temperature rise show various trends, mainly influenced by factors such as microstructure variation, quartz content, transformation plasticity of clay minerals, etc.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Mechanics
Xianzhao Song, Lin Jiang, Lifeng Xie, Bin Li, Dan Zhang
Summary: The experiment observed the von Karman vortex street in a droplet breakup induced by shock waves and high-speed fluid, recorded the interaction between the droplet and shock wave, and obtained details of flow fields and transients. The results suggest that vortex-induced vibration may dominate the oscillation in the horizontal direction, enhancing the deformation and breakup of the droplet when the oscillating flow frequency matches the droplet's natural frequency. The data may be useful for benchmarking related multiphase flow models or nonlinear theories.
Article
Physics, Applied
Liangli Xiong, Yi Liu, Wei Yuan, Hua Li, Fuchang Lin, Yuan Pan
Summary: The study investigates the fracturing behavior of repetitive electrohydraulic shock waves (EHS) in deep rock formations under static pressure conditions. It reveals that static pressure significantly inhibits the formation, distribution, and growth of microcracks. The rate of accumulation of microcracks in the slow-growth phase can be controlled by adjusting the discharge energy levels.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Geological
Jianjun Hu, Heping Xie, Mingzhong Gao, Cunbao Li, Qiang Sun
Summary: This paper analyzes the effects of thermal shock fatigue on the physical and mechanical properties and heat conduction of limestone. The study finds that an increase in temperature and the number of cycles leads to a decrease in the P-wave velocity, thermal conductivity, and tensile strength of limestone. The research provides important insights for the development of geothermal carbonate reservoirs.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Mechanical
Yuekun Xing, Yang Yu, Bingxiang Huang, Binghong Li, Hang Xu, Xuanye Fan, Haoran Yu
Summary: Thermal-shock-dependent thermoplastic fracturing is a prominent characteristic of hydraulic fracturing in high-temperature reservoirs. The study proposes a description model of rock thermoplastic fracture properties related to thermal shock and quantitatively delineates seven thermoplastic fracture characteristics of thermal-shock-treated granite. The findings highlight the importance of considering thermoplastic fracture characteristics in hydraulic fracturing applications for high-temperature reservoirs.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Thermodynamics
Wenguang Li, Guopeng Yu, Zhibin Yu
Summary: The convective heat transfer characteristics of air in a laboratory-scale thermal chimney with rectangular cross-section were investigated through experimental and numerical studies. Computational fluid dynamics simulations were performed to obtain the temperature and flow fields in the chimney. The results showed that the thermal characteristics of the chimney with two row heaters were better than that with single row heaters, and the convective Nusselt number of the low row heaters was enhanced by 11.6-29.8% compared with the single row heaters.
APPLIED THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Arman Haghighi, Mohammad Reza Pakatchian, Mamdouh El Haj Assad, Vinh Nguyen Duy, Mohammad Alhuyi Nazari
Summary: Geothermal energy, as a renewable energy source, is widely used due to its independence from weather conditions. Organic Rankine cycles play a crucial role in generating power from low- or medium-temperature heat sources in geothermal power plants. The performance of geothermal-based ORCs is greatly influenced by the operating fluid, working conditions, and cycle configuration.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Computer Science, Interdisciplinary Applications
A. Z. Zhang, S. T. Millmore, N. Nikiforakis
Summary: This study focuses on the simulation of ablation of geological materials using millimeter wave source. A new mathematical model is developed to address the thermal approach to the problem, allowing for large-scale simulations with temperature-dependent material parameters. The model is implemented in an adaptive meshing framework, which improves computational efficiency. It is validated through experimental results and used to demonstrate its capabilities for simulating millimeter wave drilling processes. The effects of surface conditions and material variations on wellbore evaporation behavior and resulting structure are investigated.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Geochemistry & Geophysics
Guangquan Li, Kui Liu, Xiang Li
Summary: This paper uses a viscous squirt model to simulate the velocity and attenuation of ultrasonic P-wave in water-saturated sandstone. By fitting the phase velocity from the model with the measured velocity at a frequency of 500 kHz, the quality factor due to viscous squirt (Q(ps)) is determined as a function of frequency, with Q(ps) being 14.64 at a frequency of 0.8 MHz. Using the measured total quality factor (Q(p)) of 6.9 at 0.8 MHz, the dry quality factor (Q(pd)) is found to be 13.0 at 0.8 MHz. The study also reveals the consistency between the grain diameter and the dimension of the rock unit, as well as the presence of two different porosities and an aperture distance.
Article
Green & Sustainable Science & Technology
Keigo Kitamura, Hiroyuki Honda, Osamu Nishizawa, Yasuhiro Mitani
Summary: The study found that the CO2 injection rate significantly affects the distribution and saturation of CO2 in porous media, and that geophysical parameters Vp and electrical resistivity ?* can be used to monitor two-phase flow. Resistivity is particularly sensitive to CO2 saturation, while Vp is related to the size of CO2 volumes.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Engineering, Geological
Ning Li, Shicheng Zhang, Haibo Wang, Shan Wu, Yushi Zou, Xinfang Ma, Tong Zhou
Summary: The experimental results showed that the thermal shock effect was beneficial for reducing the maximum amplitude of AE events during laboratory fracturing experiments on Laizhou granite, but it was only effective when the thermal treatment level exceeded 300 degrees Celsius. At the thermal treatment level of 300 degrees Celsius, increasing the number of cycles had little influence on reducing breakdown-induced seismicity.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Reyhaneh Ebrahimi-Jaberi, S. Jalali-Asadabadi
Summary: In this work, the mechanical and thermal properties of antiferromagnetic UX2 (X=P, As, Sb) compounds are investigated. The unique compressibility patterns and the preference for shear deformation in these compounds are revealed. These compounds exhibit characteristics on the brittle/ductile borderline and their mechanical strength is significantly influenced by shear deformation. Among the UX2 (X=P, As, Sb) compounds, UP2 stands out due to its higher Debye temperature. The study also provides insights into the anisotropic behavior of these materials and their potential applicability in high-temperature settings. Overall, the research validates the methodologies and uncovers fascinating new aspects of the mechanical and thermal properties of these compounds, deepening our understanding of the interplay between atomic constitution and physical properties.
MATERIALS CHEMISTRY AND PHYSICS
(2024)