Article
Physics, Multidisciplinary
Jack R. R. Panter, Andrew R. R. Konicek, Mark A. A. King, Arben Jusufi, Mohsen S. S. Yeganeh, Halim Kusumaatmaja
Summary: Capillary rise is a wetting phenomenon that plays a crucial role in various fields. This study focuses on the coupling between capillary rise and hemiwicking, and reveals the complexities of wetting and roughness. It shows that the critical contact angle for hemiwicking is separation-dependent and the rise heights and volumes differ between smooth and rough systems. The authors propose a Dual-Rise model to accurately predict these phenomena.
COMMUNICATIONS PHYSICS
(2023)
Article
Engineering, Mechanical
Pranay Vinayak Likhar, Adarsh Divakaran, Satish Kailas
Summary: This article introduces a parallel pendulum tribometer designed for experiments at lower sliding speeds. The tribometer overcomes stiffness-related issues and has a higher resolution. The experimental results show that HDSA is more effective in reducing friction at lower sliding velocities compared to HD.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Energy & Fuels
Joshua D. Wilbur, Chris Dames
Summary: Traditional pyroelectric energy conversion research has focused on improving energy output per cycle, but this study analyzes power output optimization for pyroelectric energy harvesting systems. The study highlights the importance of the average temperature amplitude of the pyroelectric material compared to the available thermal resource. By considering different types of thermal energy sources, figures of merit are identified to improve power harvesting performance within different frequency regimes.
Review
Chemistry, Applied
S. G. Croll
Summary: This article discusses the causes and factors of coating failure, including environmental stress cracking, swelling and compression caused by moisture, thermal mismatch and bending. Degradation of the coating can lead to increased likelihood of failure of small defects, while the material becomes brittle, resulting in increased modulus and tensile strength, and decreased elongation and fracture surface energy. The Lake-Thomas theory and Poisson's ratio are also mentioned in relation to the structure and performance of the coating.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Environmental Sciences
Ting Wang, Ran Hu, Zhibing Yang, Chen-Xing Zhou, Yi-Feng Chen, Chuang-Bing Zhou
Summary: This study investigates the transitions of dissolution patterns in rock fractures under different flow-rate and reaction-rate conditions. Three distinct dissolution morphologies, namely compact, wormhole, and uniform patterns, are observed and quantified. The critical Peclet numbers for the transitions increase with the reaction rate. A theoretical model based on the growth of dissolution channels in the flow and transverse directions is established to describe the transitions. The phase diagram predicted by the model agrees well with experimental results and previous studies, enhancing the understanding of fracture aperture expansion in dissolution processes.
WATER RESOURCES RESEARCH
(2022)
Letter
Mechanics
Guo-Zhen Ma, Chun-Xiao Xu, Hyung Jin Sung, Wei-Xi Huang
Summary: This paper proposes a roughness scaling method based on the direct numerical simulation of turbulent channel flow over three-dimensional sinusoidal rough walls in a transitionally rough regime. A new coupling scale is defined and the relationships between various parameters are explored.
Article
Energy & Fuels
Hu Meng, Hongkui Ge, Xiaoqiong Wang, Jialiang Zhang, Yinghao Shen, Xing Liang, Fanhua Meng
Summary: The stress shadow effect of hydraulic fractures has significant influence on the stress regime, causing instability and activation of natural fractures. The study analyzes the mechanism of stress regime transformation through single and multiple hydraulic fractures, and evaluates the impact of stress regime transformation on natural fractures and hydraulic fracture propagation pattern using models.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Civil
Yong Luo, Zhenyu Zhang, Yakun Wang, Jan Nemcik, Jiahua Wang
Summary: The influence of roughness, aperture, and asperity irregularity on fluid flow regimes in rough rock fractures was investigated through experimental and numerical studies. It was found that there are three different fluid flow regimes in the fractures, including pre-linear flow, linear Darcy's flow, and post-linear flow. The pre-linear flow is caused by the slippage effect of water-fracture interfaces, while the post-linear flow is mainly due to inertial effects.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Chemical
Jie Zhou, Dong Liu, Qinghong Zhang, Fei Wang, Yuliang Liu, Chao Bian, Xiaobin Wang, Xiuxia Meng, Naitao Yang
Summary: This study focuses on the revelation of energy conversion and dissipation in Hydraulic-driven rotary energy recovery device (HD-RERD) by exploring the operating performances under multiple conditions. The results show that the rotor speed follows a cubic function and internal leakage exhibits a linear relationship within specific pressure ranges. Salinity mixing leads to extra energy consumption, and the ratios of dissipation energy to total energy conversion are determined for hydraulic driven, internal leakage, and pressure losses at certain pressure and flowrate conditions. This study provides valuable insights for researchers and engineers in understanding the energy conversion in HD-RERD.
Article
Engineering, Mechanical
Runze Cai, Jize Mao, Hui Qi, Jia Qu, Qingyong Guo
Summary: This paper investigates the cracking behavior of repaired concrete structures through notched dynamic semi-circular bend tests. The results show that both the dynamic fracture toughness and crack propagation speed of concrete increase linearly with the loading rate. A threshold value exists beyond which the crack speed stabilizes, and the notch depth has little influence on the fracture toughness. Cracks propagate along the aggregates and remain intact under low loading rates, but penetrate and roughen the fracture surface at higher loading rates. Repaired concrete structures exhibit greater energy dissipation and produce flying fragments with lower kinetic energy, providing protection against secondary damage.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Multidisciplinary Sciences
Youbo Nan, Xiutong Wang, Hui Zhou, Yanan Sun, Teng Yu, Lihui Yang, Yanliang Huang
Summary: The development and utilization of triboelectric nanogenerator (TENG) are crucial for achieving clean energy in electrochemical processes. This study focuses on the fabrication of a porous and high-roughness PDMS (PR/PDMS) negative friction layer and its application in a TENG. The PR-TENG exhibits significantly improved performance, with a maximum output open-circuit voltage (V-oc) of 77.1V and short-circuit current density (J(sc)) of 33.9A/m(2). The concept is further demonstrated through the construction of an electrochemical cathodic protection system. The potential of PR-TENG as a clean energy source for electrochemical processes is explored and evaluated.
Review
Engineering, Mechanical
Xingbao Huang, Bintang Yang
Summary: Vibration control is a crucial issue in many industrial fields, and it can improve the working capability of mechanical devices, prolong the service life of sensitive components, and enhance the security and stability of flexible structures. Dynamic vibration absorbers (DVAs) are widely developed and used due to their easy design, friendly installation, low attached mass, and wideband vibration attenuation. This review investigates various vibration suppression technologies and establishes collaboration between different vibration control methods from the perspective of energy shunt.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Electrochemistry
Renee De Wolf, Alana Rossen, Michiel De Rop, Luis Fernando Arenas, Tom Breugelmans, Jonas Hereijgers
Summary: In this study, the performance of a vanadium flow battery was improved by applying a pulsating flow regime, which showed that a pulsating flow can be beneficial in certain conditions for boosting performance in flow batteries, opening up new possibilities.
BATTERIES & SUPERCAPS
(2023)
Article
Energy & Fuels
Kun Yang, Fu-Yong Wang, Jiu-Yu Zhao
Summary: Based on high-pressure mercury injection and nuclear magnetic resonance experiments, this study describes the pore distribution of tight sandstone. The influence of fractures, core porosity and permeability, and surfactants on the spontaneous imbibition of tight sandstone is investigated. The findings show that fractures can effectively reduce oil drop adsorption on the core surface, increasing the imbibition recovery rate. Enhanced pore connectivity, higher core porosity and permeability, and the use of surfactants contribute to improved imbibition recovery of tight oil reservoirs.
Article
Engineering, Civil
Sepide Zakeri, Randy Hazlett, Krishna Babu
Summary: Spontaneous imbibition is the primary mechanism for oil expulsion to the fracture network during waterflooding, and a thorough understanding of this phenomenon is crucial for process improvement.
JOURNAL OF HYDROLOGY
(2023)
Article
Chemistry, Physical
Xiaofeng Xiong, Zhibing Yang, Ran Hu, Yi-Feng Chen
Summary: Colloid transport and deposition are affected by pore structures and transport history. The classical colloid filtration theory (CFT) assumption of homogeneous single-collector efficiency is not accurate for predicting deposition. We propose an upscaled model based on average collector efficiency and geometric model, which more accurately predicts deposition rate compared to equations based on single-collector efficiencies. Considering array packing structures is significant in CFT for predicting colloid transport in industrial and field applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Environmental
Ting Wu, Zhibing Yang, Ran Hu, Yi-Feng Chen
Summary: In this study, the transport and retention behaviors of colloids during immiscible two-phase flow are explored using confocal microscopy. The results show that colloid aggregation and distribution are strongly influenced by flow rate and pore/grain size. The mechanism responsible for the clogging behavior of colloids is elucidated through theoretical analysis. These findings highlight the need for improved predictive models to incorporate the overlooked clogging behavior.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Renjun Zhang, Zhibing Yang, Russell Detwiler, Dongqi Li, Gang Ma, Ran Hu, Yi-Feng Chen
Summary: This study reveals that the effect of liquid cohesion on particle clogging has been overlooked in previous studies. Visualized experiments show that even a tiny amount of additional immiscible wetting liquid can dramatically enhance clogging. An experimental phase diagram of clogging patterns is obtained, and the combined effect of suspension composition and hydrodynamic condition on the clogging behavior is analyzed. A theoretical model of agglomerate size is proposed to quantify the capillary cohesion effect. This work improves the understanding of fines migration and particle-clogging behaviors in the subsurface and paves the way for controlling particle transport and clogging in various applications.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Zejun Wang, Zhibing Yang, Ran Hu, Yi-Feng Chen
Summary: By using microfluidic experiments, the impacts of surfactants on the mass transfer rate at the pore scale were investigated. It was found that surfactants can induce droplet breakup behaviors and subsequent micro-movement of daughter blobs due to interfacial disparity of mass transfer strength. The study also revealed a significant inhibition of mass transfer rates by surfactants at high concentrations, but an overall improvement in mass transfer flux due to enhanced driving force caused by the surfactant-enhanced concentration gradient.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Zexiong Zhou, Zhibing Yang, Cao Luo, Song Xue, Chi Yao, Ran Hu, Yi- Feng Chen
Summary: In this study, a theoretical model considering inertia was proposed to explore the inertial effect on liquid splitting at fracture intersections. It was found that neglecting the inertial effect leads to underestimation of liquid partitioning into the branch fracture. The influence of key parameters, such as the inclination angle, fracture apertures, and contact angles, on the droplet splitting behaviors was also investigated.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Yi-Feng Chen, Wang Ren, Zhibing Yang, Ran Hu, Yan-Pian Mao, Chuang-Bing Zhou
Summary: This study investigates the hydrogeological changes induced by reservoir filling and operation at the Xiluodu dam site in southwest China. Hierarchical numerical simulations reveal the rise in groundwater levels and the exchange between confined and unconfined aquifers. The results are valuable for decision-making regarding dam operation and safety assessment.
JOURNAL OF HYDROLOGY
(2023)
Article
Chemistry, Multidisciplinary
A. Hubao, Zhibing Yang, Ran Hu, Yi-Feng Chen
Summary: Using molecular dynamics simulations, we investigated the wetting characteristics of water on different mineral surfaces. We obtained water-mineral interaction properties, mineral wettability, and structural and diffusion properties of water molecules near the surface. Our results show that the diffusion properties of water molecules play a crucial role in wetting characteristics. We also demonstrated the significant impact of isomorphic substitution and charge-balancing counterions on the wetting properties of clay minerals.
Article
Engineering, Geological
Chang Zhao, Yang Xiao, Jian Chu, Ran Hu, Hanlong Liu, Xiang He, Yi Liu, Xiang Jiang
Summary: Enzymatically induced carbonate precipitation (EICP) in heterogeneous subsurface was experimentally investigated using microfluidic cells with different pore networks. The impact of flow rate and pore-scale heterogeneity on the precipitation process and the morphology of calcium carbonate crystals was quantitatively evaluated. The analysis showed that low flow rates and strong heterogeneity in porous media favor the precipitation process due to more nucleation sites. Additionally, the complex pore structures generated by the precipitates limit the transport of reactants and result in permeability reduction. The study contributes significantly to the understanding of the advection-diffusion-reaction coupling effect and the role of pore network in the biomineralization process.
Article
Geochemistry & Geophysics
Ran Hu, Kai Li, Chen-Xing Zhou, Ting Wang, Zhibing Yang, Yi-Feng Chen
Summary: This study investigates the impact of buoyancy-driven convection on dissolution dynamics and permeability increase in horizontal fractures, using microfluidics/Hele-Shaw experiments and numerical simulations. The results show that buoyancy-driven convection breaks the symmetry of dissolution on the upper and lower surfaces, and three dissolution regimes are identified. Additionally, the study reveals that the gravitational effects suppress the permeability increase in the mixed convection regime due to gravitational instability near the fracture inlet. This work advances our understanding of dissolution regimes and permeability evolution in horizontal fractures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Chen-Xing Zhou, Ran Hu, Hang Deng, Bowen Ling, Zhibing Yang, Yi-Feng Chen
Summary: Fluid-rock dissolution is widely observed in geological systems. This study examines the effect of dissolution regimes on scaling laws by conducting microfluidic experiments on limestone. It is found that the scaling conforms to classic law in regime I (uniform) but deviates significantly in regime II (localized), due to the formation of a gas phase layer that hinders acid-rock contact. A theoretical model is proposed to describe the regime transition, which provides guidance for using scaling laws in multiphase flow environments. This work enhances the accuracy of dissolution modeling in carbon sequestration.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Song Xue, Zhibing Yang, Zexiong Zhou, Ran Hu, Yi-Feng Chen
Summary: Understanding the behavior of fluid flow at intersections in a fracture network is crucial for studying unsaturated flow dynamics. The study proposes a fracture network model to analyze the impact of local flow behavior on the macroscopic unsaturated flow. The results show that the dynamics and structure of unsaturated flow in networks are influenced by local splitting behavior and exhibit self-organized criticality. This study provides new insights into the complex flow dynamics of unsaturated flow in fractured media.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Le Zhang, Zhibing Yang, Yves Meheust, Insa Neuweiler, Ran Hu, Yi-Feng Chen
Summary: Two-phase flow involving non-Newtonian fluids in fractured media is of vital importance in natural processes and subsurface engineering applications. In this study, we conducted experiments to investigate the displacement dynamics of a shear-thinning fluid in a rough fracture. Based on qualitative and quantitative analyses, we presented a phase diagram of displacement patterns and proposed a theoretical model to elucidate the flow regime transitions.
WATER RESOURCES RESEARCH
(2023)