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Article
Engineering, Chemical
Kai Wang et al.
Summary: A novel triaxial vibration method is developed to characterize the particle size distribution (PSD) in pneumatic particulate flow in real-time, which is critical for chemical industry. The particle-wall collision and friction behaviors were analyzed, and verification experiments of PSD characterization in pneumatic flow were performed. The results showed that the triaxial vibration method achieved real-time PSD characterization with low error rates.
Article
Engineering, Chemical
Ran Li et al.
Summary: This paper reports the results of studying the translational and rotational velocity profiles of spherical particles in a conical silo with mixed flow. The discrete element method (DEM) based on the Hertz-Mindlin (no slip) with RVD rolling friction contact model is used for simulations. Opposite correlations between translational and rotational velocities are found in different flow areas of the silo. Specifically, rotational abrasion is dominant in the funnel flow area. Additionally, increasing the mass flow rate of the silo can effectively reduce rotation-induced abrasion. This highlights the importance of understanding the dynamic characteristics of particles for optimizing silos and reducing granular material abrasion.
Article
Engineering, Chemical
Feiyang Chen et al.
Summary: This study presents the discrete element method (DEM) simulations of wedge-shaped hopper discharge of milled pine and investigates the influence of various hopper processing parameters and pine material attributes. The results show that the opening width, semi-inclination angle, rolling friction, and moisture-induced cohesion critically affect the hopper discharge dynamics.
Article
Engineering, Chemical
Behrooz Jadidi et al.
Summary: The design parameters of a mixing system significantly impact the quality of the final product. However, the studies on the effects of the mixer's design features are still insufficient. This study used the Discrete Element Method to investigate the influence of paddle angle, width, and gap on the mixing performance of a twin paddle blender. The results showed that the paddle angle and width are critical factors for achieving better mixing quality, while the paddle gap does not significantly affect the mixing efficiency and power consumption of the mixer.
Article
Engineering, Chemical
Lei Xu et al.
Summary: In this study, a high-fidelity super-ellipsoid Discrete Element Method (DEM) model is established to investigate the discharge behaviors of non-spherical particles. The effects of particle shape (aspect ratio and particle sharpness) on the particle level discharge behaviors are investigated. The results show that the discharge rates of the ellipsoid particles used in the current work are larger than the spherical particles due to the larger solid fraction.
Article
Engineering, Chemical
Kevin M. Kellogg et al.
Summary: In this study, the inputs for a recent continuum theory for cohesive particles were estimated for moderately cohesive particles using DEM simulations of an oscillating shear flow. The inputs determined from oscillating shear flow were then used for continuum predictions of gas-solid riser flow. The study demonstrated the feasibility and accuracy of the continuum theory for moderately cohesive particles by comparing the continuum predictions with DEM simulations.
Article
Engineering, Chemical
Jiecai Long et al.
Summary: This study characterizes the mixing performances and power consumption of a twin-blade planetary mixer with non-cohesive particles using the discrete element method (DEM). The DEM model was experimentally verified for simulating particle flow and mixing kinetics. Results show that particle mixing is achieved through radial, circumferential, and vertical circulations, as well as local collisions and mergers. Increasing the absolute speed and speed ratio enhances the circulation and mixing performance but increases power consumption. The swept volume of blades plays a significant role in the mixing performance.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Arthur Pascot et al.
Summary: This study focuses on the influence of external vibrations on granular flows in a nearly-2D silo. Both experimental measurements and numerical simulations were conducted to investigate the impact of vibrations and opening size on the flow. The results show that vibrations can either increase or decrease the flow rate depending on the range of experimental parameters. Two flow regimes are identified, characterized by the Froude number and the relative frequency. In the first regime, vibrations cause flow in dead zones, leading to a decrease in flow rate described by Benyamine's law. In the second regime, vibrations surpass gravity-driven flow, resulting in periodic shocks and an apparent increase in flow rate.
Article
Engineering, Chemical
Cameron McGuire et al.
Summary: Innovations in food extrusion technology have resulted in its rapid expansion and applicability in various areas. This study investigates the relationship between raw material particulate rheology and granular flow in a single screw food extruder. Using corn, wheat, and sucrose as model particulate systems, the study determined various characteristics and flow parameters using a powder rheometer. The results showed that properties such as flow energy and cohesion were good indicators of flowability in an extruder.
Article
Engineering, Chemical
Yujia Liu et al.
Summary: This research focuses on the residence time distribution (RTD) in silo discharging and examines the feasibility of using neural network methods for RTD prediction. The results reveal that neural networks offer a significant advantage in computing speed while maintaining an acceptable level of prediction accuracy.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Chengxiu Wang et al.
Summary: This study investigates the characterization of solids holdup in fluidized bed reactors using visualization technology. Calibration curves of different types of particles are obtained by correlating the grayscale of digital images with solids holdup. These calibration curves are then applied to experimentally measure solids holdup in fluidized beds, validating the effectiveness of the method. This method is important for evaluating fluidization quality and reactor performance.
Article
Engineering, Chemical
Lei Ren et al.
Summary: The multiphase flow in the mold was studied in this research by using experimental methods. It was found that the oil phase has a significant impact on the flow velocity, blowing enhances turbulence and suppresses surface velocity, and the size and flow rate of bubbles also affect the flow characteristics.
Article
Engineering, Chemical
Bin Li et al.
Summary: This study investigates the flow patterns in a monolayer pebble bed formed in a two-dimensional silo, revealing the rules of solid flow patterns in a three-dimensional silo. Using a whole-field particle tracking platform, the effects of outlet size, inclination angle, and outlet configurations on the solid flow patterns are analyzed. The findings provide useful insights for predicting free discharge in silos with similar dimensions and configurations.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Leigh Duncan Hamilton et al.
Summary: This study proposes the use of dry water to store large amounts of water in non-absorbent, coarse sand while maintaining its bulk properties. Different variants of dry water were mixed with the sand particles, and it was shown that dry water can incorporate significant water content without degrading the flow properties.
Article
Physics, Fluids & Plasmas
Prasad Sonar et al.
Summary: This study experimentally investigates crack formation and decompaction-wave propagation in a vibrated powder bed consisting of 5 μm glass beads. The vibrated powder bed demonstrates three distinct phases under different vibration conditions: consolidation, static fracture, and dynamic fracture. Notably, when the powder bed is strongly vibrated, an upward wave propagation is observed in the dynamic fracture regime. An interesting finding is that in fine cohesive powders, the decompaction-wave propagation speed, normalized to gravitational speed, is independent of the vibration strength. This suggests that the wave propagation speed is influenced by the balance between gravity and cohesion effect rather than vibration strength. The universality of the wave propagation phenomenon in coarser and low-density granular powders is also explored.
Review
Engineering, Chemical
Shahab Golshan et al.
Summary: This paper provides a comprehensive review of the flow of free-flowing particles inside silos, focusing on theoretical approaches for numerical simulation and modeling. The advantages and limitations of different simulation methods are discussed, along with the effects of various parameters on granular flow in silos. Finally, future research perspectives and main challenges in this area are highlighted.
REVIEWS IN CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Shuai Zhang et al.
Summary: In this study, the fluctuation of gravity-driven hopper flow was investigated through experimental and numerical analysis, revealing different probability density functions for particle discharge under various geometrical and operating conditions. Three modes of particle discharging were identified, and the findings may have implications for the design and operation of high-precision feeding systems.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Rafal Kobylka et al.
Summary: The study investigated the effects of sliding friction coefficient, rolling friction coefficient, and modulus of elasticity of particles on clogging in the outflow of wooden spheres. Despite deviations from ideal conditions, no significant discrepancies were found in the results, and a direct relationship between interparticle friction and clogging was not observed. However, a correlation between the stability of the dome formed at flow arrest and rolling friction was noted.
Article
Engineering, Chemical
Yujia Liu et al.
Summary: In this study, a full-field high-accuracy PTV algorithm for pebble flow measurement was developed, which improved accuracy through enhanced matching algorithms and introduced two correcting methods for errors in experimental data. The original PTV algorithm achieved an average accuracy of 90% under different flowrates, which was increased to 98% with the adoption of a three-point co-circular amending method, and exceeded 99% with the LP polygon amending method applied. The adaptability and stability of the algorithm were also tested.
Article
Engineering, Chemical
Arthur Pascot et al.
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Engineering, Chemical
Jianping Du et al.
Article
Engineering, Chemical
Shahab Golshan et al.
Article
Engineering, Chemical
Yanlong Han et al.
ADVANCED POWDER TECHNOLOGY
(2019)
Review
Engineering, Chemical
Khashayar Saleh et al.
CHEMICAL ENGINEERING SCIENCE
(2018)
Article
Engineering, Chemical
Michael Rackl et al.
Review
Mechanics
Yu Guo et al.
ANNUAL REVIEW OF FLUID MECHANICS, VOL 47
(2015)
Article
Engineering, Chemical
Juwei Zhang et al.
Article
Physics, Multidisciplinary
S. M. Rubio-Largo et al.
PHYSICAL REVIEW LETTERS
(2015)
Article
Engineering, Chemical
Irena Sielamowicz et al.
Article
Mechanics
Thomas Weinhart et al.
Article
Materials Science, Multidisciplinary
Thomas Weinhart et al.
Article
Engineering, Chemical
Irena Sielamowicz et al.
Article
Materials Science, Multidisciplinary
Isaac Goldhirsch
Review
Engineering, Chemical
Alan W. Roberts
Article
Physics, Multidisciplinary
A. Janda et al.
Article
Engineering, Chemical
YJ Li et al.
Article
Engineering, Chemical
I Sielamowicz et al.
CHEMICAL ENGINEERING SCIENCE
(2005)
Article
Engineering, Multidisciplinary
S Luding et al.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2001)
