Article
Engineering, Geological
Sayedmasoud Mousavi, Majid Ghayoomi
Summary: The study found that application of non-disruptive techniques to sands containing fines is crucial for liquefaction mitigation, with microbial-induced partial saturation showing promising results for sands with various silt contents. Experimental results indicated that MIPS-treated samples did not liquefy regardless of fines content and shear strain amplitude, suggesting the potential for effective liquefaction mitigation in such conditions. A semi-empirical equation was developed to predict excess pore pressure generation in partially saturated conditions, showing reasonable accuracy for clean and silty sands with variable degrees of saturation.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Soil Science
S. Nachum, M. Talesnick, E. Weisberg, R. Zaidenberg
Summary: Vertisols shrink and crack when dry and swell when wet, resulting in the formation of slickensides. Experimental data confirms the development of lateral soil swelling pressure during wetting, which can cause shear and failure of the soil.
Article
Engineering, Geological
Zhixiong Zeng, Lingwei Kong
Summary: This study investigated the hydro-mechanical behavior of Yanji weathered mudstone subjected to different wetting-drying-freezing-thawing (WDFT) cycles. The experimental results showed that the cyclic number and the type of process had significant effects on the swelling strain, compression index, rebound index, and hydraulic conductivity of the mudstone. The WDFT process was found to have a more pronounced influence on the mudstone's hydro-mechanical behavior compared to the separate wetting-drying or freezing-thawing processes.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Construction & Building Technology
Kangle Zuo, Xiaoqiang Gu, Chao Hu, Jing Hu, Guangyun Gao
Summary: In this study, the effects of fines content (FC) and sand gradation on small strain shear modulus G0 in sand-fines mixtures were investigated. The results showed that G0 continuously decreased as FC increased, reaching nearly 50% of clean sand at the highest FC. The stress dependence of G0 was found to be insensitive to FC. A new predictive model was proposed to evaluate G0, taking into account the effects of void ratio, confining pressure, FC, and sand gradation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Artem Iakunkov, Ulrich Lienert, Jinhua Sun, Alexandr V. Talyzin
Summary: Pressure-induced swelling has been reported earlier for several hydrophilic layered materials. MXene Ti3C2Tx, a hydrophilic layered material composed of 2D sheets, has also been reported to exhibit pressure-induced swelling, but only under conditions of shear stress at MPa pressures. In this study, high-pressure experiments were performed using MXenes prepared by two methods known to provide clay-like materials.
Article
Energy & Fuels
Wei Yang, Liang Wang, Hao Wang, Siwen Zheng, Xiwei Han, Guangwei Xu
Summary: This study confirms the effects of ultrasonic vibration on heat transfer in coal seams through theoretical analysis and simulation experiments. It reveals the influence of frequency and sound pressure on ultrasonic heat transfer, as well as the improvement of porosity and permeability of coal matrix caused by thermal expansion. Additionally, the use of ultrasonic-assisted gas recovery technology can increase gas drainage and has significant potential for engineering applications in coalbed methane recovery.
Article
Energy & Fuels
Mohammadreza Zare Reisabadi, Manouchehr Haghighi, Mohammad Sayyafzadeh, Abbas Khaksar
Summary: In this study, a mathematical model was developed to evaluate the dynamic stress distribution and permeability changes in coal by considering the desorption area and non-desorption area. The results indicate that the desorption radius has a significant effect on stress distribution in the coalbed.
Article
Polymer Science
Ethan E. O'Banion, S. Shams Es-haghi
Summary: The rheological behavior of cellulose nanofibril (CNF) suspensions with different fines contents and solid concentrations was investigated. The samples showed a gel-like behavior with the highest dynamic moduli observed in samples with 50% fines. CNF suspensions with higher concentrations exhibited higher viscosity and dynamic moduli. A critical shear rate of 10 s-1 was found, above which viscosity measurements converged and below which they diverged. Yield stress decreased and then reached a plateau as fines levels increased. The lowest structure recovery was observed in samples with 50% fines content. A rheopectic-thixotropic transition was observed in samples with high fines content at low solid concentrations.
Article
Mechanics
Qi Dai, Xiang Wang, Wenbin Feng, Zijie Zhao, Zeqing Guo, Zhihua Chen
Summary: Non-isothermal effects on turbulence anisotropy and growth rate are investigated in high convective Mach number supersonic mixing layers. The non-isothermal effects enhance energy transfer and attenuate turbulence anisotropy, accelerating the growth of the shear layer and destabilizing the supersonic mixing layer. However, the fluid viscosity and viscous dissipation are enhanced, leading to a stronger three-dimensionality and a decrease in the mixing layer growth rate.
Article
Engineering, Mechanical
Chaolin Wang, Yu Zhao, Cong He, Jing Bi
Summary: In this study, a simple auxiliary device and particle flow code were used to conduct tension-shear tests on red sandstones. The results showed that the mechanical behaviors of the samples were affected by the sample height and base hollow diameter, and there was a transition from shear failure to hybrid tension-shear failure.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Environmental
Honggang Zhao, Huang Gun, Changbao Jiang, Chao Liu
Summary: This study analyzed the radial stress distribution in the surrounding rocks of a tunnel and loaded different asymmetric radial stresses to accurately reflect the stress state. The mechanical response, fracture mode transformation, and properties of sandstone specimens were studied. The results showed a transition from brittleness to ductility with increasing depth of surrounding rocks from the tunnel surface. The strength of sandstone specimens increased gradually with depth, following a power function. Fracture modes transformed from tensile splitting to tensile-shear complex and finally to shear fracture due to the asymmetric radial stresses. Four types of failure zones in the radial direction of surrounding rocks were identified based on the fracture modes. The importance of considering shear fracture and large deformation in the support of tunnels was emphasized.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Jielin Lu, Xuehai Fu, Junqiang Kang, Ming Cheng, Zhenzhi Wang
Summary: The accurate characterization of coal pore structure is crucial for CBM development. Different coal rank reservoirs exhibit varying matrix and pore/fracture compressibility, with low-rank coal showing the highest compressibility. As effective stress increases, the compressibility of microfractures decreases, and the compressibility of coal decreases with higher coal rank.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Mechanical
Ali Aminzadeh, Bahador Bahrami, Majid Reza Ayatollahi, Morteza Nejati
Summary: The study shows a tension-based fracturing type prevailing in the DNBD samples of polymethyl-methacrylate (PMMA). A comparison between PMMA and rock samples demonstrates the main reason for the different observed fracturing types.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Review
Chemistry, Physical
Faisal Ur Rahman Awan, Muhammad Arif, Stefan Iglauer, Alireza Keshavarz
Summary: In this review, the influence of coal fines on coal seam gas reservoir permeability and their generation, migration, and mitigation factors are systematically investigated. By summarizing the recently published literature, a more up-to-date discussion of this field is provided, which plays a significant role in understanding coal fines migration and associated knowledge.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Geological
Maria A. Nikolinakou, Andrew J. Whittle, John T. Germaine, Guoping Zhang
Summary: Experimental observations and a conceptual model are presented to understand the compression and swelling characteristics of Old Alluvium from San Juan, Puerto Rico. The study describes breakdown of clay aggregates and cemented structure through high-pressure incremental consolidation tests, explaining changes in compression properties and significant swelling during unloading. These observations provide the basis for formulating a constitutive model to describe macroscopic compression and swelling behavior of the soil.
Article
Green & Sustainable Science & Technology
Eric J. Guiltinan, M. Bayani Cardenas, Philip C. Bennett, Tongwei Zhang, D. Nicolas Espinoza
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2017)
Article
Geosciences, Multidisciplinary
Agustin Sosa Massaro, D. Nicolas Espinoza, Marcelo Frydman, Silvia Barredo, Sergio Cuervo
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2017)
Article
Engineering, Geological
Luis Alberto Hernandez-Uribe, Michael Aman, D. Nicolas Espinoza
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Engineering, Geological
Zhuang Sun, D. Nicolas Espinoza, Matthew T. Balhoff, Thomas A. Dewers
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Energy & Fuels
Michael Aman, D. Nicolas Espinoza, Anastasia G. Ilgen, Jonathan R. Major, Peter Eichhubl, Thomas A. Dewers
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
(2018)
Article
Water Resources
Hojung Jung, Gurpreet Singh, D. Nicolas Espinoza, Mary F. Wheeler
ADVANCES IN WATER RESOURCES
(2018)
Article
Energy & Fuels
Xiongyu Chen, D. Nicolas Espinoza
Article
Energy & Fuels
Xiongyu Chen, D. Nicolas Espinoza
Article
Energy & Fuels
Igor Shovkun, D. Nicolas Espinoza
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2018)
Article
Environmental Sciences
Xiongyu Chen, Rahul Verma, D. Nicolas Espinoza, Masa Prodanovic
WATER RESOURCES RESEARCH
(2018)
Article
Environmental Sciences
Eric J. Guiltinan, J. E. Santos, M. Bayani Cardenas, D. Nicolas Espinoza, Qinjun Kang
Summary: Fractures serve as important conduits for fluid flow in low-permeability geological formations, with their multiphase flow properties playing a crucial role in natural processes and engineering applications. The wettability of fracture surfaces has a significant impact on the displacement of water and CO2 within fractures.
WATER RESOURCES RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Xiaojin Zheng, D. Nicolas Espinoza, Matthieu Vandamme, Jean-Michel Pereira
Summary: Commercial-scale development of CO2 geological storage requires robust monitoring methods to track the injected CO2 plume and ensure storage. Pressure monitoring above the injection zone can detect potential CO2 leaks. This study presents a model to predict pressure changes in the caprock due to hydraulic communication and partially undrained loading. The results show that pressure changes in the caprock are closely related to the advancement of the CO2 plume. This research demonstrates the feasibility of pressure monitoring to track CO2 plumes and emphasizes the need for high precision pressure measurements for correct interpretation.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Energy & Fuels
Xiongyu Chen, Nicola Tisato, Peter B. Flemings, Nicolas Espinoza
Summary: In this study, depressurization and thermal stimulation experiments were conducted on hydrate-bearing sand, and X-ray computed tomography was used to model fluid flow and calculate gas flow properties during hydrate dissociation. The results showed that partial dissociation by depressurization starts at the hydrate-fluid interface and leads to secondary hydrate formation before final dissociation. In contrast, partial dissociation by thermal stimulation primarily occurs at the mineral-hydrate interface. Estimations of gas effective permeability suggest that a Corey relative permeability model with a hydrate saturation exponent of n = 3.4 and a gas saturation exponent of n(g) = 2.6 can be used to predict fluid flow in methane hydrate-bearing sediments.
Proceedings Paper
Engineering, Multidisciplinary
Igor Shovkun, D. Nicolas Espinoza
POROMECHANICS VI: PROCEEDINGS OF THE SIXTH BIOT CONFERENCE ON POROMECHANICS
(2017)
Article
Physics, Fluids & Plasmas
Zhuang Sun, Zihao Li, Nicolas Espinoza, Matthew T. Balhoff
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.