Article
Engineering, Chemical
Nir Santo, Dimitry Portnikov, Haim Kalman
Summary: This paper presents a thorough experimental investigation of particle velocity, acceleration length, and velocity profile in a hydraulic conveying system. The study compares and combines experimental results with pneumatic conveying data, providing correlations for characteristics' evaluation in the range of tested operating conditions.
Article
Engineering, Chemical
Xuejiao Liu, Wenqi Zhong
Summary: In this study, the influences of diverse factors on the minimum spouting velocity (U-ms) of a binary system in a cylindrical-conical spouted bed were investigated. The results showed that U-ms was closely related to the particle properties, operating conditions, and blending ratio of the mixture. A novel empirical correlation was proposed to quantitatively predict U-ms in binary mixtures.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
O. Orozovic, A. Lavrinec, R. McCloy, M. H. Meylan
Summary: This paper addresses the challenge of relating the dynamic properties of individual slugs to steady feed rates by developing a numerical framework for modeling single slugs. The framework, based on finite difference approximation, provides a fundamental and quantitative tool for analyzing slug dynamics and serves as a foundation for further research.
Article
Engineering, Chemical
Zhenyu Yang, Fei Yan, Panpan Tu, Rui Zhu
Summary: In this study, a dune model was designed and installed in the bend to reduce energy consumption and wear in the pneumatic conveying process. Experimental and numerical simulation results showed that the installation of the dune model reduced the minimum pressure drop velocity, decreased the number of collisions between particles and the tube wall, and improved particle diffusion and acceleration in the vertical tube.
Article
Energy & Fuels
Yun Ji, Yating Hao, Ning Yi, Tianyuan Guan, Dianrong Gao, Yingna Liang
Summary: Pneumatic conveying is widely used in coal mining, and the pickup velocity is a key factor in the study of gas-solid two-phase flow. This study experimentally investigated the pickup velocity of pebble particles and found that the airflow velocity can suitably describe the relationship between pickup velocity and particle pickup ratio. The optimal swirl number for the highest particle pickup ratio was also determined. Different methods were used to measure the pickup velocity, and the accuracy was found to be highest when using the mass-loss rate of the particle as the measurement index. These findings contribute to the long-distance transportation of spraying materials in inclined roadways under the shaft.
Article
Engineering, Chemical
Xin Li, Fei Yan, PanPan Tu, Yun Chen, Yan Zheng, Rui Zhu
Summary: Experimental study shows that using oscillatory flow in horizontal-vertical pneumatic conveying can reduce powder consumption and decrease pressure drop in bends, especially more evident in larger radius ratio bends.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
PanPan Tu, Yuyao Shao, Qunyan Chen, Fei Yan, Ping Liu
Summary: The particle dynamic characteristics in the bend were revealed using high-speed particle image velocimetry and wavelet transform. Different motion patterns of particles were found in various regions of the bend, with distinct changes in auto-correlation coefficients at critical positions.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Sanjay Kumar Verma, Jeetram Yogi, Sunil Kumar, Anshu Anand
Summary: The current study aims to investigate the segregation in the dilute phase transport through a pneumatic conveying system. Different types of nonspherical particles such as ellipsoids (prolate and oblate), cube, and elongated needles are mixed with spherical particles to study the influence of non sphericity. Experiments are performed to examine the effects of particle and system parameters such as particle size, particle shape, gas velocity, and solid loading rate on segregation. The results show that the shape and size of particles, as well as parameters like gas velocity and solid loading rate, have a significant impact on segregation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Haifeng Lu, Hu Ruan, Xiaolei Guo, Haifeng Liu
Summary: In this study, experiments were conducted on the transfer bottle in a self-built pneumatic logistics transmission system to investigate its key performance. The different states of the transfer bottle were characterized using pressure signal analysis and high-speed camera technology. Frictional characteristics of the system and the dynamic friction coefficient of the transfer bottle were obtained through force analysis. A model was developed to predict the critical gas velocity of the system, and the velocities of the transfer bottle in motion were evaluated based on the energy conservation theory.
Article
Engineering, Chemical
Jianfei Ding, Chang Qi, Xingqing Yan, Xianshu Lv, Shuai Zhang, He Liang, Tao Fan, Jianliang Yu
Summary: The study investigated the flame propagation and pressure characteristics of dust explosions during the airflow transportation of dust particles. Experiments were conducted using a transparent pipeline and various airflow velocities. The results showed distinct stages of flame propagation and revealed the effect of airflow velocity on flame speed and explosion pressure.
Article
Chemistry, Multidisciplinary
Sudipta Let, Nirjhar Bar, Ranjan Kumar Basu, Sudip Kumar Das
Summary: The properties of a solid-water fluidized bed were studied using a binary mixture of irregularly shaped sand particles. A binary mixture was created by mixing sand particles in different weight ratios, and the influence of various operating parameters on the minimum elutriation velocity was investigated. It was observed that the minimum elutriation velocity decreases with an increase in the proportion of lighter particles in the binary mixture, and increases with an increase in column diameter. A simplified empirical correlation was developed to predict the minimum elutriation velocity, and its accuracy was validated using artificial neural network (ANN) and genetic algorithm (GA) hybrid approach.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Biao Feng, Zhao Yang
Summary: The study focused on the burning velocity characteristics of R152a and R1234yf, suggesting a potential new refrigerant mixture. Three calculation methods for predicting the burning velocity of binary mixed flammable refrigerants were proposed. The prediction accuracy of the component equivalent simplified method was found to be the highest among the three methods when compared with experimental data.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Chemical
Fei Yan, PanPan Tu, Xin Li, Yun Chen, Yan Zheng, Rui Zhu
Summary: The experimental study focuses on the particle motion characteristic of bends in a horizontal-vertical pneumatic conveying system, highlighting the importance of particle rope as a large-scale motion affecting particle movement and the suppression of small-scale motion to reduce pressure drop.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yan Zheng, Dan Zhang, Hiroka Rinoshika, Lanchun Zhang, Lin Dong, Zhang Ni, Akira Rinoshika
Summary: This study investigates the multi-scale particle dynamics in a horizontal pneumatic conveying system with two types of soft fins. Measurements of particle velocity fields are conducted using high-speed particle image velocimetry for cases with and without fins. The particle fluctuation velocities are then decomposed into different scales using one-dimensional orthogonal wavelet decomposition. The results show that the non-uniform case of Fin260 yields the highest particle velocities and fluctuation energies, resulting in the lowest pressure drop and conveying air velocity. The energy distributions of wavelet components indicate that the particle fluctuation energies become more concentrated at wavelet levels 3 and 4 when using fins, especially for the non-uniform Fin260 case. Correlation analysis reveals that the spatial correlation of wavelet components is associated with their contribution to the measured particle fluctuation energy. Oscillating soft fins modulate the air turbulence and promote spatially correlated particle motions within a specific frequency range.
Article
Chemistry, Multidisciplinary
Gulab Singh, Tong Deng, Michael S. A. Bradley, Richard Ellis
Summary: This study evaluated the degradation of wood pellets and roasted coffee beans in a pneumatic conveyor and investigated the effects of particle velocity and concentration on the degradation. The results showed that degradation and fines generation increased with an increase in particle velocity, while the opposite trend was observed with an increase in particle concentration in the pipeline. It was concluded that the degradation in a pneumatic conveying system is complex and challenging to evaluate due to various influential factors.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Henry J. Tanudjaja, Jia Wei Chew
Summary: This study utilizes random forest and neural network to predict the critical flux of oil-in-water emulsions in crossflow microfiltration. The results suggest that crossflow velocity is the most dominant parameter, although casein concentration can also have an impact. Machine learning tools can enhance the understanding and prediction of critical flux.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Allan S. Issangya, S. B. Reddy Karri, Ray A. Cocco, Ted Knowlton, Jia Wei Chew
Summary: This study measures the density and solid flux profiles of CFB risers, and discovers different types of solid flow patterns and multiple fluidization regimes. The findings suggest that commercial FCC risers may operate in similar regimes as observed in this study.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Engineering, Environmental
Allan S. Issangya, Ray Cocco, Jia Wei Chew
Summary: Fluidized bed strippers are important in FCC and fluid coking processes. They can effectively remove hydrocarbon vapors from catalyst particles, preventing product loss and high temperatures in the regenerator. Various types of baffles are used in these strippers. Disk and donut strippers in FCC applications have been the focus of attention. Previous studies have investigated stripping efficiency, solids mass flux, stripping gas velocity, flooding, and other flow dynamics issues. Commercial stripper operating problems have been identified and diagnostic methods have been proposed. However, fundamental theories on mass transfer in strippers are lacking.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Huang Teik Lay, Chi Siang Ong, Rong Wang, Jia Wei Chew
Summary: The study demonstrates that the DLVO approximation methods used to predict interfacial foulant-membrane interactions are sensitive to the boundary condition assumptions. Both the Poisson-Boltzmann (P-B) and linear superposition approximation (LSA) equations can quantify electrostatic interaction energy, but the LSA equation provides more accurate predictions in various filtration tests.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Meilan Pan, Junjian Li, Xue Zhang, Subiao Liu, Jia Wei Chew, Bingjun Pan
Summary: The introduction of axial coordination in the Co-N-4 site of single-atom cobalt catalyst can alter its spatial structure and transform it into an active center, leading to improved catalytic activity. The catalyst with axial coordination showed higher reaction kinetics and turnover frequencies in the electroreduction of nitrobenzene.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Engineering, Environmental
Fuweng Zhang, Kaiqiao Wu, Damiano La Zara, Michael J. Quayle, Feilong Sun, Gunilla Petersson, Staffan Folestad, Jia Wei Chew, J. Ruud van Ommen
Summary: By depositing different materials as nanoscale films onto micronized budesonide powders using atomic/molecular layer deposition (ALD/MLD) coatings, the flow properties of the powders can be altered and improved. Inorganic nanofilms deposited via ALD can reduce inter-particle forces, leading to improved drug delivery performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Juan Pablo Santana, Carlos I. I. Rivera-Solorio, Jia Wei Chew, Yong Zen Tan, Miguel Gijon-Rivera, Ivan Acosta-Pazmino
Summary: Numerical simulations were conducted to evaluate the technical and economic feasibility of a solar water desalination system using a hybrid CPVT collector and a VMD process. The CPVT collector with a triangular receiver and PV cells facing the reflecting surface was found to be advantageous in generating more electricity with less surface area. The optimal surface area of collectors and input temperature of the VDM module were determined through parametric analysis.
Article
Engineering, Chemical
Henry J. Tanudjaja, Angie Qi Qi Ng, Jia Wei Chew
Summary: Protein fouling is a complex mechanism and this study used the Random Forest (RF) and Neural Network (NN) models to determine the relative influences of parameters on fouling. Results showed that membrane pore size is the most dominant influence, followed by transmembrane pressure. The NN model demonstrated modest predictive capability despite inconsistencies in experimental setups.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Environmental Sciences
Meilan Pan, Xue Zhang, Junjian Li, Jia Wei Chew, Bingjun Pan
Summary: In this study, a heterogeneous MoS2-coated S,N-graphene (SNG) membrane (O-MoS2@SNG) was developed through a facile strategy. The electrochemical performance of O-MoS2@SNG was optimized and exhibited superior electrocatalytic performance (>90%) of bi-sphenol A with a large permeation volume in the online electrofiltration system.
Review
Engineering, Environmental
Casey Q. LaMarche, Ben Freireich, Ray Cocco, Jia Wei Chew
Summary: Numerical methods like computational fluid dynamics (CFD) for predicting multiphase flow involving solid particles offer promising benefits to a wide range of applications. Accurate representation of the fluid-particle momentum exchange, i.e., the drag and buoyancy forces, is crucial for studying fluid-particle hydrodynamics. However, there is a lack of widely accepted guidance on the most appropriate drag correlations for flow past homogeneous suspensions of spherical particles with narrow size distributions. This review addresses this gap and highlights the need for further development and validation of drag models in industrial fluid particle flows.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Jia Zheng Oor, Chi Siang Ong, Yong Zen Tan, Jia Wei Chew
Summary: A covalent organic framework (COF) - incorporated thin film composite (TFC) membrane was successfully fabricated by in-situ formation of benzene-1,3,5-tricarboxaldehyde (TFB) and graphene oxide (GO) in p-Cymene. The resulting PES-COF-GO membrane exhibited high solvent permeance and separation efficiency in organic solvents.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Review
Biochemistry & Molecular Biology
Yong Zen Tan, Nur Hashimah Alias, Mohd Haiqal Abd Aziz, Juhana Jaafar, Faten Ermala Che Othman, Jia Wei Chew, Chii-Dong Ho
Summary: Nanofibrous membranes have shown promise in membrane distillation for water and wastewater treatment, but fouling and wetting are still critical issues. This mini-review discusses the understanding and limitations of fouling in membrane distillation, including organic, inorganic, and biofouling. It also highlights progress in developing anti-fouling nanofibrous membranes and modifications for improved performance. Challenges and future directions for developing anti-fouling nanofiber membranes for membrane distillation are systematically addressed.
Review
Chemistry, Multidisciplinary
Yan Liu, Yun Tian, Jianda Xu, Changfu Wang, Yun Wang, Dingzhong Yuan, Jia Wei Chew
Summary: This review summarizes the recent research progress on graphene-based electrodes in the field of ion electrosorption, especially in water desalination utilizing capacitive deionization (CDI) technology. The latest advances in graphene-based electrodes, such as 3D graphene, graphene/metal oxide composites, graphene/carbon composites, heteroatom-doped graphene, and graphene/polymer composites, are presented. Furthermore, the challenges and future possible developments in the electrosorption area are also addressed, providing insights for researchers to design graphene-based electrodes towards practical applications.
Article
Environmental Sciences
Kai K. Chen, Weiyi Li, Jia Wei Chew
Summary: This study systematically evaluated the filtration capability of NF-like membranes with different combinations of PAH- and PVAm-containing bilayers in an FO process. It was found that increasing the PVAm content in the upper part of the active layer resulted in decreased water permeability and rejection of divalent salts. The membrane coated solely with PVAm-containing bilayers exhibited the fastest flux decline in fouling tests with SA, but the fouling layer was more easily removed by crossflow. OCT characterization showed that the bridging effect of divalent cations promoted the aggregation of SA, forming a particulate layer more susceptible to shear effect. These findings provide insights for improving NF-like FO by regulating the formation of the active layer via LbL assembly.
Review
Chemistry, Physical
Yi Mou, Xingzhong Yuan, Haoyun Chen, Yi Yang, Huan Dai, Jing Bai, Junying Chen, Jia Wei Chew, Hou Wang, Yan Wu
Summary: Rapid industrialization and population growth have led to an unprecedented demand for safe and reliable water supplies. Traditional sewage treatment technology can no longer meet the increasingly strict standards for safe drinking water. Reticular materials have gained interest in water treatment due to their adjustable aperture, and their design and synthesis with water stability are analyzed in this review. The latest research progress of reticular materials in wastewater treatment technologies is also discussed. This review is expected to help with the design and development of reticular materials for successful water treatment.
JOURNAL OF MATERIALS CHEMISTRY A
(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.