Article
Construction & Building Technology
Lin Kong, Dongya Ren, Shengxiong Zhou, Zhaoyi He, Changfa Ai, Chuanqi Yan
Summary: This study used digital image correlation (DIC) technology to investigate the anti-crack performances and fracture propagation of basalt fiber-reinforced cold recycled mixture (BFCRM). The results showed that the basalt fibers maintained strong anti-crack performance in cold-recycled mixtures and reduced fracture damage. The fracture surface morphology also revealed that basalt fiber exhibited adsorption, bridging, anchoring, stability, and strengthening effects at micro/nano scale, which further improved anti-crack performance and hindered crack development of cold recycled asphalt mixtures.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Jing Hu, Pengfei Liu, Qibo Huang, Zhendong Qian, Sang Luo
Summary: Studying the effect of recycled aggregates (RA) on the interfacial zone failure of asphalt mixture can enhance the utilization of construction and demolition wastes (CDW) in pavement engineering. Results show that increasing RA percentage causes more interface failure, with the damage of cement mortar and its interface with asphalt mortar being the primary resources of failure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Wenbo Li, You Huang, Zhaohui Liu, Li Liu
Summary: Strain sensors are crucial in monitoring the structural response of asphalt pavements. This study investigates the factors that influence the synergistic deformation of the sensor and the asphalt mixture, aiming to reveal the working mechanism and improve the application of sensor data. The results show that loading mode and magnitude, temperature, and sensor position deviation are key factors affecting the compatibility of deformation between the sensor and the asphalt mixture.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Ying Gao, Kun Hou, Yanshun Jia, Ziyao Wei, Shaoquan Wang, Zhuoran Li, Fan Ding, Xiwei Gong
Summary: The study focused on the variability of gradation for asphalt mixtures, experimenting with different aggregate sizes and establishing correlations between gradation and performance through various methods. The feasibility of digital image processing technology in detecting gradation was verified through the experiments.
AUTOMATION IN CONSTRUCTION
(2021)
Article
Engineering, Chemical
Dongdong Han, Guoqiang Liu, Yinfei Xi, Yongli Zhao, Dong Tang
Summary: This paper proposed an algorithm to reconstruct the microstructure of asphalt mixture considering the dynamic arrangement process of aggregate particles. By introducing impulse-based rigid collision response, the method was able to simulate the rearrangement of aggregate particles during the compaction process. The predicted dynamic modulus and thermal conductivity of the generated specimens coincided well with the experimental results, indicating the reliability of the proposed method for reconstructing the heterogeneous structure of asphalt mixture with relatively low air void content.
Article
Construction & Building Technology
Changyun Shi, Huanan Yu, Guoping Qian, Xi Li, Xuan Zhu, Ding Yao, Chao Zhang
Summary: This research focused on asphalt mixture gradation design and found that a proper gradation can provide excellent volumetric and mechanical properties. A two-parameter Weibull distribution model was proposed to describe the aggregate gradation, and the applicability of the Weibull model and the fractal model was compared for different gradations. The influence of gradation characteristics parameters on mixture volumetric indexes was evaluated through 332 groups of field and experimental gradation designs. Factors impacting the uniaxial compressive strength (UCS) of porous asphalt concrete were assessed using grey correlation analysis, and a multiple regression model for UCS of mixture was developed. The results showed linear correlations between gradation characteristics parameters and mixture volumetric indexes, and it was feasible to predict the UCS of asphalt mixture using known material parameters.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Cadnel Ago, Guowei Li, Jiantao Wu, Nur Izzi Md Yusoff
Summary: Hydrophobic aggregates help prevent stripping-off of asphalt on roads, while also reducing asphalt consumption and cost. Geopolymer-based artificial aggregates show exceptional properties and can be used as a sustainable alternative to natural aggregates. This study presents a new hydrophobic geopolymer-based aggregate made from rice ash, fly ash, sodium hydroxide, and sodium silicate. It demonstrates that coating the artificial aggregate with asphalt improves its hydrophobic nature, making it suitable for use as recycled aggregate pavement.
Article
Construction & Building Technology
Dongdong Han, Yinfei Xi, Yichang Xie, Zhaocheng Li, Yongli Zhao
Summary: This paper presents a virtual generation method for the heterogeneous microstructure of asphalt mixtures, using real aggregates and a dynamic simulation framework. The generated digital specimens were verified and used for finite element method simulations, showing good agreement with experimental results. This method has applications in studying the spatial distribution of components, particle movement during compaction, and microscopic numerical simulations.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Xiucheng Yang, Haizhu Tang, Xu Cai, Kuanghuai Wu, Wenke Huang, Qiran Zhang, Hao Li
Summary: This study proposed a novel approach to analyze the homogeneity of recycled asphalt mixture using the efficiency of force chain transferring stress. Vertical section images were obtained through digital image processing, and a force chain network was constructed based on the aggregate contact information. The homogeneity index D of the recycled asphalt mixture was proposed based on the variation coefficient of the vertical stress transferring efficiency (VSTE).
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yuechan Wang, Liwan Shi, Xiongxin Li, Tao Liu, Ruifeng Xu, Duanyi Wang
Summary: This study establishes a skeleton contact Voronoi diagram model to quantitatively evaluate the skeleton contact characteristics of asphalt mixtures. The results show that this model effectively describes the spatial information of asphalt mixtures and is of great significance for asphalt mixture quality and pavement construction.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Qibo Huang, Zhendong Qian, Jing Hu, Dong Zheng, Leilei Chen, Meng Zhang, Jinzhu Yu
Summary: This study investigated the interfacial transition zones (ITZs) in recycled concrete aggregate asphalt mixture (RCAM) using nanoindentation test, backscattered electron image-analysis (BSE), and energy dispersive spectroscopy (EDS). The results showed that the thickness and elastic modulus of ITZs in RCAM varied with different components in recycled concrete aggregate (RCA), and the elastic modulus increase could indicate reduced asphalt exfoliation degree. Additionally, the study highlighted the potential effects of aggregate compositions and morphologies on ITZ and adhesion between RCA and asphalt.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ziqi Gao, Dong Lei, Hong Chen, Jintao He, Enjie Kong, Yongmin Xu
Summary: The influences of four kinds of fly ash content and two aggregate types on the mechanical behavior of interfacial transition zone (ITZ) in concrete are studied. The micro measurement method using optical microscopy (OM) and digital image correlation (DIC) demonstrates the improved properties of ITZ with fly ash. The ITZ of the sample with 10% fly ash content has the thinnest thickness and the highest nominal compressive elastic modulus (ENC), while basalt aggregate shows a smaller thickness and larger ENC compared to granite aggregate.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Construction & Building Technology
Yanqiu Bi, Fucheng Guo, Jiupeng Zhang, Jianzhong Pei, Rui Li
Summary: The study investigates the correlations between asphalt binder/mastic properties and dynamic modulus of asphalt mixture, as well as the influence of various asphalt and aggregate parameters on the dynamic modulus master curve.
Results show that the type of binder and ratio of filler to binder significantly affect the dynamic modulus master curve of asphalt mixture, while the type of gradation, aggregate, and filler have a slight impact.
Among the prediction models, the improved Hirsch model shows the most consistent results, while the M-vertical bar E*vertical bar models predict lower values than measured values, and both models perform well under certain conditions such as dense gradation and appropriate filler-to-binder ratio.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Hu Jiang-san, Wang Lan, Luo Xin
Summary: The primary objective of this research is to investigate the anti-fatigue performance of warm-mixed rubber powder modified asphalt mixture under freeze-thaw cycles with different concentrations of salt solutions. Experimental and numerical analysis were conducted to study the formation and development of microcracks and macrocracks. The results showed that the fatigue life of warm-mixed rubber powder modified asphalt mixture is slightly higher than that of hot-mixed rubber powder modified asphalt mixture. The DIC deformation field can be used to evaluate the effects of salt solution concentration and freeze-thaw cycles on the fatigue damage process of mixed specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yunlian Song, Yu Sun
Summary: It was found that basalt fibers can enhance the low-temperature crack resistance of phase-change asphalt mixtures, with the optimal dosage being 3%o. The addition of basalt fiber increased the fracture strength of the phase-change asphalt mixture, delayed its damage time, improved its deformation capacity, reduced the crack development rate and damage degree of the interface, and enhanced its low-temperature crack resistance. The study also showed that the new index D-f based on image analysis method and MATLAB software is reliable for evaluating the relationship between crack resistance and mechanical properties.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Jiaqiu Xu, Bin Hong, Guoyang Lu, Tianshuai Li, Shengxian Wang, Congxiao Wang, Dawei Wang
Summary: A novel modifier of asphalt, carboxylated styrene-butadiene latex (XSB), was studied for its application in the construction of flexible pavement in cold regions. It was found that XSB significantly enhanced the mechanical properties of asphalt and reduced the production temperature of modified asphalt, providing a solution with low energy consumption and low emissions for environmental challenges.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Tianshuai Li, Guoyang Lu, Jiao Lin, Dong Liang, Bin Hong, Sang Luo, Dawei Wang, Markus Oeser
Summary: This study investigated the feasibility of using liquid isocyanate-based additive in bitumen modification and compared it with the conventional SBS modified bitumen. The results showed that isocyanate modification can reduce temperature, VOCs emission, and energy consumption in the bitumen preparation process.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Yulin He, Xuan Yang, Shenqing Xiao, Pengfei Liu, Guoyang Lu, Chao Xing, Zepeng Fan, Wei Sheng, Dawei Wang
Summary: Driving speed, pavement type, surface characteristics, intermediate media, and tire properties are important factors that impact the frictional behavior between tire and pavement. A lack of equipment that can simulate the skid resistance behavior of high-speed vehicles based on real tire in the laboratory has been identified. To address this deficiency, High-speed Friction Testing (HSFT) equipment was developed, which utilizes real tire loading and provides reliable results for multi-factor coupling skid resistance tests. The results indicate that driving speed, water film thickness, and tire load have a negative correlation with skid resistance, with water film thickness having the greatest influence.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Xuan Yang, Zepeng Fan, Jiaqiu Xu, Jiao Lin, Yulin He, Dawei Wang, Pengfei Liu
Summary: This study investigated the feasibility of using graphite tailings (GTs) as fillers for asphalt mastics. The results showed that the GTs exhibited better mechanical properties and dielectric properties compared to limestone, making them a viable material for sustainable asphalt pavements. This study provides a solution for the comprehensive recycling and reuse of GTs, reducing economic and environmental costs.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Engineering, Civil
Chaohe Wang, Dawei Wang, Pengfei Liu, Yulin He, Markus Oeser
Summary: Unmanned driving is the future development direction in transportation, relying heavily on sensor monitoring and machine control. Establishing a vehicle-pavement coupling model based on road roughness data is significant for analyzing and guiding driving comfort, cargo safety, and road friendliness. This study constructed a 3D model of pavement roughness using fractal theory, and proposed a revised 3D flexible roller contact tire model. Vibration dynamics models for different vehicles were established, providing threshold conditions for ride comfort, cargo safety, and road friendliness. The results showed that pavement roughness significantly affected vehicle vibration, and the proposed models accurately calculated vibration characteristics and dynamic load coefficients in real time, providing theoretical suggestions for future unmanned ground vehicles.
JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS
(2023)
Review
Engineering, Civil
Hui Yao, Zijin Xu, Yue Hou, Qiao Dong, Pengfei Liu, Zhoujing Ye, Xin Pei, Markus Oeser, Linbing Wang, Dawei Wang
Summary: The road is a crucial civil infrastructure that plays a significant role in society. Its quality and lifespan directly impact the safety and comfort of users. Therefore, engineers consider road construction, condition detection, monitoring, and maintenance as highly important. Recent research has revealed the application of industrial informatics approaches, such as image processing, computer-based algorithms, and advanced sensors, inroads. This review examines the industrial application of these technologies, analyzing the pros and cons of each. It focuses on road construction, maintenance decision strategy, road structure evaluation, smart sensing in roads, and cooperative vehicle infrastructure systems. Through industrial informatics, engineers hope to advance the development of smart, safe, and sustainable roads.
JOURNAL OF TRAFFIC AND TRANSPORTATION ENGINEERING-ENGLISH EDITION
(2023)
Article
Construction & Building Technology
Zepeng Fan, Fei Pan, Lu Sun, Dawei Wang, Pengfei Liu
Summary: Adhesive failure between bitumen and aggregates is a major issue in pavement cracking and moisture damage. The influence of mineralogy on adhesion properties is studied through molecular dynamics simulations and finite element method. Results show that quartz with bitumen has the best cracking resistance at the molecular scale, and greywacke aggregate exhibits the best cracking resistance at the microscale level. The distribution microstructure of minerals affects the cracking path of the bitumen-aggregate interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Dawei Wang, Xuan Yang, Xiangyu Chu, Yulin He, Zepeng Fan, Chao Xing, Pengfei Liu
Summary: Road marking system is a crucial component of asphalt pavement, providing irreplaceable support for improving traffic safety. The durability and environmental impact of road markings are important considerations, which are currently not fully addressed in laboratory tests. In this study, an Accelerated Wearing Tester (AWT) was developed to simulate the wearing process between tires and road markings. Results showed that skid resistance of road markings fluctuated significantly with wearing time, and environmental analysis indicated the emission of pollutants such as alkanes and benzenes. Attention must be given to the safety and environmental concerns of road marking materials. The method established in this study lays the foundation for future improvements in driving safety and environmental friendliness of road marking materials.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Qilin Yang, Zepeng Fan, Pengfei Liu, Dawei Wang
Summary: Graphene can improve the mechanical performance and durability of bitumen composite, but its reinforcement mechanism is not clear. This study used molecular dynamics simulation to analyze the mechanisms of tensile and shear fractures in a graphene-reinforced bitumen composite. The results showed that graphene in the orthogonal plane has higher shear strength and can support and transmit shear loads better. The study provides atomic-level insight into the reinforcement mechanism and can contribute to future applications of carbon nanomaterials in transportation infrastructure.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Dawei Wang, Chengsen Ye, Haotian Lv, Luopei Meng, Fujiao Tang, Yaowei Ni, Pengfei Liu
Summary: This study investigated the dielectric properties of asphalt mixtures under different temperatures and frequencies. It was found that the dielectric constants and dielectric loss factors have a linear relationship with temperature, while the growth rates vary with frequency. Nonlinear fitting was used to develop prediction models for the dielectric loss factor and dielectric constant, and these models showed improved accuracy and robustness compared to classical models.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Editorial Material
Multidisciplinary Sciences
Yue Hou, Qiao Dong, Dawei Wang, Jenny Liu
Summary: Transportation infrastructures are crucial in modern society, and failures in these infrastructures can lead to significant damage. Artificial intelligence (AI) has become a powerful tool for analyzing and preventing engineering failures in transportation infrastructures and materials, offering advantages such as convenient characterization, failure information extraction, performance evaluation, long-term performance prediction based on big data, and optimization of maintenance strategies. In the future, AI techniques will be even more effective in data collection, transmission, fusion, mining, and analysis, helping engineers quickly detect, analyze, and prevent failures in transportation infrastructures and materials.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Zhihao Cheng, Xiao Li, Qilin Yang, Naixing Liang, Liangliang Chen, Shaopeng Zheng, Dawei Wang
Summary: Porous asphalt pavements have advantages in drainage, traffic safety, and noise reduction, but may weaken the mechanical properties. This study investigates the compaction characteristics and skeleton contact state of porous asphalt mixtures. The research finds that there are distinct stages in the compaction process. All gradations meet the maximum porosity requirement, while only the medium and fine gradations meet the minimum requirement. Furthermore, medium-graded mixtures exhibit better skeletal embedding and strength, providing theoretical support for material grade optimization.
Article
Construction & Building Technology
Tianshuai Li, Sang Luo, Jiao Lin, Guoyang Lu, Dong Liang, Markus Oeser, Dawei Wang
Summary: The use of MDI-based additives to prepare IMB is an effective solution for achieving energy savings and performance improvements. This study investigates the aging properties of IMB through experimental and quantum chemical calculations, revealing the role of chemical reactions and noncovalent interactions in delaying oxidation. The findings provide insights into the aging behaviors of IMB and offer references for the design of chemically modified bitumen.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yaowei Ni, Yanhui Zhong, Haotian Lv, Chengsen Ye, Dawei Wang, Fujiao Tang, Pengfei Liu
Summary: This study investigates the influence of temperature on the dielectric properties of limestone, cement mortar, and concrete, and proposes a temperature-dependent dielectric model for concrete. The results show that the dielectric constants of these materials increase with temperature, and there is a linear relationship between dielectric constants and temperature. The proposed model has higher precision and is less sensitive to temperature variations compared to traditional models.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jiaqiu Xu, Zepeng Fan, Qilin Yang, Guoyang Lu, Pengfei Liu, Dawei Wang
Summary: Recycling biomass by converting it into hydrothermal carbon (HTC) and using it to modify bitumen is an effective way to develop sustainable pavements. This study found that HTC significantly improves the high-temperature and fatigue properties of bitumen, and prevents the aggregation and crystallization of wax components and asphaltenes in bitumen. The fibrous composition and porous structures of HTC enhance the interaction with bitumen, reinforcing and connecting the bitumen matrix.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
