Article
Engineering, Chemical
Shijo Js, Niranjana Behera
Summary: In this study, the response surface methodology was used to model the straight-line pressure drop and a multiple regression model was developed to predict the pressure drop. By utilizing experimental data, the model can be applied to predict the pressure drop for different pipeline configurations.
Article
Engineering, Chemical
Jiawei Zhou, Linjian Shangguan, Kuidong Gao, Yanhua Wang, Yongxing Hao
Summary: The study numerically investigated the slug characteristics of dense phase pneumatic conveying of coarse particles based on experimental verification, introducing a light medium mixed flow pneumatic conveying to improve slug formation. The study highlighted the continuous updating and rolling forward of slugs with particle exchange, the increasing slug velocity throughout the conveying process, and the segregated distribution of rear angles for formed and collapsed slugs.
Article
Engineering, Chemical
O. Orozovic, H. Rajabnia, A. Lavrinec, Y. Alkassar, M. H. Meylan, K. Williams, M. G. Jones, G. E. Klinzing
Summary: This paper presents a model for predicting pressure drop variations in pneumatic conveying systems, which can significantly reduce the number of conveying trials required. The model is based on empirical curves of constant solids flow obtained from conveying trials, and it shows good agreement for materials capable of slug flow as well as fluidised dense-phase materials.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Yassin Alkassar, Vijay K. Agarwal, R. K. Pandey, Niranjana Behera
Summary: The study modeled and analyzed the flow of fly ash in fluidized dense phase pneumatic conveying using Computational Fluid Dynamics, showing excellent matching with experimental data. Different flow regimes were investigated based on conveying velocity, solids loading ratio, and particle size distribution.
PARTICULATE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Zhen Liu, Qiang Li, Jiansheng Zhang
Summary: This paper investigated the influence of coal moisture content on the characteristics of dense-phase pneumatic conveying, revealing that coal with lower moisture content in the dense-phase region exhibits a larger solid mass flow rate and solid concentration; while the moisture content has a minor effect on conveying characteristics in the dilute-phase region.
Article
Engineering, Chemical
Heming Gao, Xiaojuan Wang, Qi Chang
Summary: A multi-scale analysis method based on electrostatic sensor array is used to investigate the flow behaviors of pulverized coal particles in dense gas-solid two-phase flow. The experimental results indicate that under steady flow, the individual particles increase and the particle clusters decrease with increasing conveying pressure difference. The particle distribution remains inhomogeneous while the particle cluster distribution tends to be more homogeneous over the cross-section of the pipe. Under unsteady flow, the average flow behavior of pulverized coal particles is dynamic, and the flow behaviors of multi-scale flow structures over the cross-section of the pipe are significantly inhomogeneous. The effect of particle size on flow behavior is also explored and confirmed.
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
Engineering, Chemical
A. Lavrinec, O. Orozovic, H. Rajabnia, K. Williams, M. G. Jones, G. Klinzing
Summary: This study used an inertial measurement unit to investigate dynamic relationships in horizontal slug flow pneumatic conveying. It found that particles propagate backwards through a slug relatively constantly and observed a pressure-velocity relationship theorized to be related to variations in the stationary layer ahead of the slugs. The study also demonstrated the IMU's capability in capturing nuanced features of slug motion.
Article
Engineering, Chemical
J. S. Shijo, Niranjana Behera
Summary: This study developed a computational fluid dynamics (CFD) model to predict the flow-mode transition of gas-solid flow when conveying fine particles through long pipelines. The model was used to examine the flow parameters in different simulation cases and the predicted air velocity at the pipeline outlet was found to be within a reasonable error margin.
PARTICULATE SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Philippe Beaulac, Mohamad Issa, Adrian Ilinca, Jean Brousseau
Summary: In the context of energy abundance, industrial systems are often exploited with minimal attention to their actual energy consumption requirements. This study aims to identify the parameters that influence the energy consumption of industrial dust collector systems for the purpose of reducing energy demand and greenhouse gas emissions through more precise control.
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
Thermodynamics
Nikola Karlicic, Milan M. Petrovic, Dejan B. Radi
Summary: This study validates two basic concepts of numerical models for predicting pressure changes in long distance and high capacity lignite ash pneumatic conveying. Fourteen different numerical models and program codes were developed using various friction factor correlations and given parameters. The input data were based on comprehensive experimental research of a high capacity and long distance lignite fly ash pneumatic conveying system. The simulation results showed the best agreement with measured pressure decreases along the transport pipelines for a model based on the momentum balance of the air-ash mixture flow and a specific friction factor correlation.
Article
Green & Sustainable Science & Technology
Mohammad Mehdi Roshani, Seyed Hamidreza Kargar, Visar Farhangi, Moses Karakouzian
Summary: Fly ash, as a supplementary pozzolanic material, can reduce the environmental impact of concrete by decreasing CO2 emissions. A novel method using artificial neural networks has been used to successfully predict the mechanical characteristics of concrete with added Fly ash.
Article
Engineering, Chemical
Fei Yan, Shihao Cheng, Zhenyu Yang, Jian Zhang, Rui Zhu
Summary: This paper investigates the distribution of system pressure drop when conveying particles using pipes with different curvature radius for pneumatic conveying system. Artificial neural network technique is used to predict the pressure drop. The results show that the pressure drop of the system is lower when using the pipe with R/D = 6.25 for conveying particles.
PARTICULATE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
O. Orozovic, H. Rajabnia, A. Lavrinec, M. H. Meylan, K. Williams, M. G. Jones, G. E. Klinzing
Summary: This paper investigates the stability of slugging in gas-solid two-phase flow and the influence of particle exchange on slug stability. By establishing an inequality relationship, the paper predicts the area in the operating conditions space where slugging can occur.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
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.