Understanding the varying discharge rates of lognormal particle size distributions from a hopper using the Discrete Element Method

Zhao, Ya; Yang, Shiliang; Zhang, Liangqi; Chew, Jia Wei

doi:10.1016/j.powtec.2018.09.080

Cited by 21 publications

(6 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 7.11 shows the normal contact forces throughout the filled hopper before discharge for the three non-spherical particle systems. The interesting observations about the force network are that (i) the forces are higher at the lower part of the hopper, which agrees with our previous study on spherical particles [183]; (ii) the forces increase with PSD width, which underlies the lower discharge rate and also jamming for wider PSDs, because of the associated restriction to movement between particles [198] due to denser packing; (iii)…”

Section: Force Networksupporting

confidence: 88%

“…As the particle bed height decreases, the plug flow zone reduces. Notably, the chaotic particle trajectories regarding the effect of particle shape in the non-spherical particle systems in Figure 6.8a-f likely slows the discharge [183]. Upon inspection of the hoppers after discharge, it was found that some hoppers are not fully emptied.…”

Section: Chaptermentioning

confidence: 98%

“…Wang et al [66] indicated that the discharge rate decreases with aspect ratio, whereas the effect of aspect ratio on discharge rate seems negligible compared to the effect of particle shape in this study; this is presumably linked to the particle volume increasing with aspect ratio in the former, whereas the particle volume is kept constant here. Secondly, the fluctuations of the discharge rate are smaller for the sphere and ellipsoids, while greater for cylinders and cuboids, which has been tied to the increased collision due to the increased angularities of the particles [14,57,183]. The mass discharged from the hoppers with time of three types of monodisperse particles (i.e.…”

Section: Chaptermentioning

confidence: 99%

See 2 more Smart Citations

An investigation into the impact of particle properties on flow behaviors

Zhao¹

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Force Networksupporting

confidence: 88%

Section: Chaptermentioning

confidence: 98%

Section: Chaptermentioning

confidence: 99%

See 1 more Smart Citation

An investigation into the impact of particle properties on flow behaviors

Zhao¹

Self Cite

View full text Add to dashboard Cite

show abstract

“…The explicit numerical method is the foundation of DEM, in which the granular system is modeled as an assembly of a finite number of singular discrete elements interacting (particle-particle or particle-wall or particle-fluid) via contact (tangential and normal) and noncontact forces (van der Waals, electrostatic, and liquid bridge). Each element can move laterally and rotationally (based on the force and torque acting on it) and is described by Newton's second law of motion [21,22]. The governing equations for the translational and rotational motions of particle i with mass m i and moment of inertia I i can be written as:…”

Section: Dem Simulationmentioning

confidence: 99%

Determination and Validation of Discrete Element Model Parameters of Soybeans with Various Moisture Content for the Discharge Simulation from a Cylindrical Model Silo

Jung

Yoon

2022

Processes

View full text Add to dashboard Cite

This study investigates the physical parameters that affect the flow patterns of soybeans with various moisture content (12% to 60%) at varying orifice sizes (20, 40, and 60 mm) in a cylindrical silo. The flow conditions required to obtain a steady mass flow during discharge were evaluated via experiments and three-dimensional discrete element method (DEM) simulation. The discharged mass flow rates at different flow conditions provided the critical size of the orifice. If the reduced diameter (Dred) of an orifice is >5.59, the flow showed a steady state. Based on the mass flow index (MFI), the flow patterns at 40% and 60% moisture content at 40 and 60 mm orifice sizes, respectively, showed funnel flows. although these flow conditions were satisfied to maintain a steady flow. The maximum wall pressure for the funnel flow showed the location of the interlocking phenomenon where the stagnant zone began during discharging. DEM simulation was validated through the mass profiles using the parameters obtained by the experiments. This study demonstrates that the experimental and analytical results with DEM simulation predict the flow behaviors of soybeans well at various moisture contents. These results are useful for designing silos for continuous food processing.

show abstract

“…Recently, scholars have focused their research on discharge characteristics in the hopper [8][9][10][11][12][13][14]. For instance, Mahajan et al [15] modified the design to improve the feeding accuracy of the belt weigh feeder system, which ensured uniform feeding of material by adjusting the gate opening of the feeding hopper and adjusting the vibrating motors attached to the feeding hopper.…”

Section: Introductionmentioning

confidence: 99%

Study the Flow Capacity of Cylindrical Pellets in Hopper with Unloading Paddle Using DEM

Huang,

Zhang,

Wang

et al. 2024

Agriculture

View full text Add to dashboard Cite

The hopper is an important piece of basic equipment used for storing and transporting materials in the agricultural, grain, chemical engineering, coal mine and pharmaceutical industries. The discharging performance of hoppers is mainly affected by material properties and hopper structure. In this work, the flow capacity of cylindrical pellets in the hopper with the unloading paddle is studied. A series of numerical simulation analyses with the aid of the discrete element method (DEM) platform are carried out. Then, the discharging process is illustrated, and the flow capacity of pellets in the hopper is analyzed by the mass flow index (MFI), the dynamic discharging angle (DDA) formed in the discharging process and porosity among pellets. Furthermore, the effect of parameters such as hopper half angle, rotation speed of the unloading paddle and outlet diameter of the hopper is investigated. The results show that MFI increases with an increase in hopper half angle or outlet diameter and a decrease in rotation speed. Meanwhile, DDA and porosity decrease with the increase in the hopper half angle or outlet diameter and the decrease in the rotation speed. Finally, the MFI ~0.24 is identified as the criterion to distinguish the mass flow from the funnel flow for the hopper with an unloading paddle, and the optimization results are decided as follows: hopper half angle greater than 60°, outlet diameter greater than 60 mm and rotation speed between 45 rpm and 60 rpm. These results should be useful for providing a theoretical reference for the optimization design of feeding devices for swine feeders.

show abstract

Understanding the varying discharge rates of lognormal particle size distributions from a hopper using the Discrete Element Method

Cited by 21 publications

References 38 publications

An investigation into the impact of particle properties on flow behaviors

An investigation into the impact of particle properties on flow behaviors

Determination and Validation of Discrete Element Model Parameters of Soybeans with Various Moisture Content for the Discharge Simulation from a Cylindrical Model Silo

Study the Flow Capacity of Cylindrical Pellets in Hopper with Unloading Paddle Using DEM

Contact Info

Product

Resources

About