Article
Engineering, Chemical
Toni El Geitani, Bruno Blais
Summary: Experiments for validating unresolved CFD-DEM software for solid-liquid flows are costly and time-consuming, and provide limited insights into local particle dynamics. The use of DEM parameters obtained from air experiments for all CFD-DEM simulations, even when dealing with liquids, is common. In this study, we designed and conducted a simple and time-efficient benchmark experiment for gas-solid and liquid-solid rotary kilns to create a validation case for unresolved CFD-DEM software. We used this case to validate the unresolved CFD-DEM model of the open-source software Lethe. The experiment highlights the importance of proper calibration of DEM surface properties and the lift force in solid-liquid flows, and shows that it is highly sensitive to the accuracy of CFD discretization.
Article
Energy & Fuels
Federico G. Vega, C. Manuel Carlevaro, Martin Sanchez, Luis A. Pugnaloni
Summary: By utilizing a coupled CFD-DEM approach, simulations were conducted on the flow of millimeter-sized particles in water between two walls and through a narrow aperture. Results showed that small variations in wall roughness significantly affected the final distribution of particles, leading to production flow rate variations of up to 50%.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Victor O. Ferreira, Toni El Geitani, Daniel Silva Junior, Bruno Blais, Gabriela C. Lopes
Summary: In this study, the accuracy of the unresolved CFD-DEM method was evaluated by comparing simulated and experimental results of a pilot-scale cylindrical liquid-solid fluidized bed. Different densities of particles were used to test various flow regimes. The comparison between experimental and simulated particles' dynamics revealed the importance of the Saffman lift force in predicting particle dispersion and preventing unphysical plumes. The results showed that the unresolved CFD-DEM method is valid for simulating liquid-solid fluidized beds.
Article
Engineering, Geological
Yingyi Zhang, Adnan Sufian, Alexander Scheuermann
Summary: The early stages of particle-scale filtration in idealised granular soils were investigated using coupled Computational Fluid Dynamics and Discrete Element Method. A wide range of size ratios and different ramping accelerations for seepage flow were considered to investigate the combined influence of geometric characteristics and hydraulic loading. The susceptibility to filtration during the early stages was shown to have a strong correlation with pore space geometry at the filter boundary.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Environmental
Justin Weber, Jonathan E. Higham, Jordan Musser, William D. Fullmer
Summary: This study focuses on quantifying the visible depth of field in a dense fluidized bed by extracting particle velocity from simulated data and high-speed videos, comparing the errors of different particle tracking methods. The results show that at a depth of one particle diameter, all three tracking codes provide accurate measurements, but errors increase when looking at full bed video measurements.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Brian D. Yamashiro, Ingrid Tomac
Summary: This study evaluates the effects of fracture roughness on proppant particle settling in fractures using computational fluid dynamics and the discrete element method. The results show that in rough fractures the attenuation of quiescent settling rates is more pronounced and erratic settling velocities are observed. Preferential flow pathways formed in rough fractures at narrower apertures are noted to cause these erratic settling behaviors.
Article
Engineering, Chemical
Yan Zhang, Wanlong Ren, Peng Li, Xuhui Zhang, Xiaobing Lu
Summary: This paper presents a numerical simulation study on dense particulate flows with coarse particles in an inclined pipe using computational fluid dynamics-discrete element method. Different flow regimes and their transitions are identified and described. The influence of Stokes number St, Froude number Fr, inclination angle fl, etc., on critical flow regimes is analyzed, and a new diagram for recognizing regime transition is given. Two dimensionless numbers, collision stress and fluid-particle interaction stress, are defined to explain the regime transition mechanism.
Article
Engineering, Chemical
Noor Ilyana Ismail, Shibo Kuang, Aibing Yu
Summary: Sand screens are widely used to control sand production in unconsolidated reservoirs, with optimizing screen size still a challenge. This paper presents a numerical study of sand retention and production behaviors for wire-wrapped screens, showing that the increase in size ratio and the presence of fluid flow enhance sand production and cause unstable sand retention. Wetting fluids play an essential role in sand production and bridging mechanisms over the slot.
Article
Energy & Fuels
Furkhat Khamitov, Nguyen Hop Minh, Yong Zhao
Summary: A coupled microscopic simulation method was used to investigate the bond breakage behavior during perforation in weak cemented sandstone, revealing the formation of a damage zone and rapid expansion of a compacted core of unbonded particles.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Chemical
M. W. Abdulrahman
Summary: This paper investigates the slurry and gas temperature profiles of the Direct Contact Heat Transfer (DCHT) process in a Slurry Bubble Column (SBC) with a high temperature gas using Computational Fluid Dynamics (CFD) simulations. The study focuses on the effects of superficial gas velocity, static liquid height, and solid particle concentration on the temperature distribution. The results show that the slurry temperature decreases with decreasing gas velocity and increases with decreasing liquid height and/or solid particle concentration.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Chemical
Yidong Guo, Xinggao Li, Yu Sun, Yi Yang, Yingran Fang, Hanyuan Li
Summary: In this study, a three-dimensional transient slurry-pebble numerical model was established based on CFD-DEM coupling to analyze the flow characteristics of slurry shield pipeline system in sandy pebble stratum. The results showed that the critical velocity of pebble varied with particle size and shape, and the pressure drop in the pipeline was influenced by slurry velocity and pipe inclined angle. The migration of large pebbles in the pipeline was observed to occur through sliding, rolling, and jumping, with different patterns for different pebbles in different pipelines.
Article
Engineering, Chemical
Wenshan Peng, Xuewen Cao, Li Ma, Ping Wang, Jiang Bian, Cunguo Lin
Summary: In this study, the influence of fluid factor, solid particle factor, and pipe size factor on the sand erosion rate of two-phase flow pipe bend in the petrochemical industry was investigated using the computational fluid dynamics (CFD) method. The effects of different factors on the erosion rate and the prediction models of the maximum erosion rate were obtained through grey correlation analysis and data fitting method. The comparison between experimental data and prediction models demonstrated good agreement. The prediction accuracy and adaptability of the two-phase flow erosion rate prediction models under gas-liquid-solid multiphase flow erosion conditions were also analyzed. This study provides ideas and prediction methods for sand erosion prediction in gas-liquid-solid multiphase flow pipelines.
Article
Green & Sustainable Science & Technology
Dengfeng Wang, Fanlu Min, Huanjie Lyu, Jian Chen, Baotian Wang, Jianfeng Zhang
Summary: The slurry shield tunneling construction process produces waste slurry, which is often dehydrated using lime as a filter aid. However, a high pH limits the reusability of the mud cake produced, leading to environmental problems. This study evaluates the use of waste sand as a substitute for lime and finds that it can effectively reduce the mud cake water content and porosity. The addition of waste sand instead of lime can also reduce the pH of the mud cake, providing a novel approach to WSL dehydration treatment and WSA reuse that has both environmental and economic benefits.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Celio Fernandes, Luis L. Ferras, Alexandre Afonso
Summary: This study evaluates the use of the computational fluid dynamics-discrete element method (CFD-DEM) numerical approach to analyze the behavior of polymer-filled suspensions in a parallel-plate rheometer. The open-source CFD-DEM solver is utilized to model these suspensions under different particle volume fractions and fluid rheologies. The numerical results show good agreement with analytical expressions and experimental measurements, demonstrating a yield stress phenomenon as the particle volume fraction increases.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Shijiao Li, Peng Zhao, Ji Xu, Li Zhang, Junwu Wang
Summary: This study investigates the fluidization of polydisperse particles in bubbling micro-fluidized beds using CFD-DEM. The study validates the method by comparing it with experimental measurements and then performs a detailed analysis of bed hydrodynamics. The results show that particle size distribution enhances fluidization quality and that significant axial segregation is observed only in the case of wide PSD. The study provides insights into the role of PSD in gas fluidization and the similarities and differences between micro and large fluidized beds.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Lei Li, Zhengrong Cheng, Carlos F. Lange
MATHEMATICAL PROBLEMS IN ENGINEERING
(2018)
Article
Energy & Fuels
Mireille B. Tadie Fogaing, Arman Hemmati, Carlos F. Lange, Brian A. Fleck
Article
Energy & Fuels
Sarah Jamal Mattar, Mohammad Reza Kavian Nezhad, Michael Versteege, Carlos F. Lange, Brian A. Fleck
Summary: This research proposes a validation methodology for CFD assessments of rooftop wind regime in urban environments, which was applied to a case study at the University of Alberta campus. The study introduced two methods of standard deviation and average to compare numerical results with measurements, showing better agreement in terms of wind speed errors and direction deviations for East and South wind directions.
Article
Mechanics
Zhe (Ashley) Chen, Fenglei Huang, Peichun Amy Tsai, Alexandra Komrakova
Summary: Surface wettability significantly affects the dynamics and stability of liquid-liquid dispersion in microfluidic channels. In this study, simulations were conducted to investigate these effects in a microchannel with heterogeneous surface wettability. Different flow patterns were observed depending on drop length and Capillary number, and the results matched well with experimental data. The presence of an intervening thin film of the continuous phase was found to be crucial in capturing the observed drop behavior.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Chemistry, Analytical
Haonan Ji, Bin Zou, Yongsheng Ma, Carlos F. Lange, Jikai Liu, Lei Li
Summary: By integrating expert system theory and fluid-structure interaction, an intelligent design optimization system is proposed to derive the optimal shape of flow channels. The system improves the accuracy of FSI simulation and the efficiency of the optimization process.
Article
Environmental Sciences
Mohammad Reza Kavian Nezhad, Carlos F. Lange, Brian A. Fleck
Summary: This study uses computational fluid dynamics to simulate the dispersion of a passive scalar in the urban wind flow and evaluates different modeling settings. The results show that the standard k - epsilon closure model outperforms the other two models in predicting scalar concentration field in complex urban geometries with building complexes.
Article
Engineering, Mechanical
Kyle Mao, Genevieve Toussaint, Alexandra Komrakova, James D. Hogan
Summary: In this study, the Generalized Incremental Stress State dependent damage MOdel (GISSMO) is used to simulate the high-velocity impact failure of Armox 500T steel. The GISSMO is calibrated and validated using experimental data from the literature, and is then applied to investigate the impact failure behaviors of bi-layered steel systems. The results provide new capabilities and insights for the design of armor structures and evaluation of impact failure behaviors in Armox 500T/RHA bi-layered systems.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Chemical
Francesco Maluta, Suzanne M. Kresta, Alexandra Komrakova
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)