Discrete particle simulation of radial segregation in horizontally rotating drum: Effects of drum-length and non-rotating end-plates

Chand, Ram; Khaskheli, Murad Ali; Qadir, Abdul; Ge, Baoliang; Shi, Quan

doi:10.1016/j.physa.2012.05.019

Cited by 79 publications

(37 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We used the open‐source DEM LIGGGHTS (liggghts.com, 2012; see Vedachalam () and Chand et al . () for recent applications), an expansion of the molecular dynamics simulator LAMMPS designed for improved granular simulations. We simulated in two dimensions the growth of roots below a tree and the resulting mounding of soil.…”

Section: Discrete Element Methods Simulations Of Root Moundingmentioning

confidence: 99%

“…Particle contacts were modeled as Hertzian springs (linear elastic mechanics in which contact forces go as indentation depths), ignoring rolling friction (for technical details of the LIGGGHTS code and its options, see Antypov and Elliott () and Chand et al . () for an in‐depth discussion). Relevant simulation parameters are given in Table .…”

Section: Discrete Element Methods Simulations Of Root Moundingmentioning

confidence: 99%

See 1 more Smart Citation

Tree root mounds and their role in transporting soil on forested landscapes

Hoffman

Anderson

2013

Earth Surf Processes Landf

View full text Add to dashboard Cite

The growth and decay of tree roots can stir and transport soil. This is one process that contributes to the mass‐movement of soil on hillslope. To explore the efficiency of this process, we document the mounding of soil beside Ponderosa and Lodgepole pine trees in the forests that dominate the mid‐elevations of Colorado's Boulder Creek watershed. Mounds are best expressed around Ponderosa pines, reaching vertical displacements above the far‐field slopes of order 10–20 cm, fading into the slope by roughly 100 cm distance from the trunks with common diameters of 30 cm. Positive mounding occurs on all sides of trees on slopes, indicating that the mounding is not attributable to deflection of a creeping flow of soil around the tree, but rather to the insertion of root volume on all sides in the subsurface. Mounding is commonly asymmetric even on cross‐slope profiles. Significant variation in the mound sizes results in no clear relationship between tree diameter and root volume displaced. These observations motivated the development of a discrete element model of tree root growth using the LIGGGHTS model, in which grains we specified to be ‘root cells’ were allowed to enlarge within the simulated granular matrix. Mounding could be reproduced, with the majority of the vertical displacement of the surface being attributable to reduction of the bulk density due to dilation of the granular matrix during root enlargement. Finally, we develop a previous analysis of the role of roots in transporting soil during growth and decay cycles. We find that even in shallow soils, the root‐cycle can drive significant soil transport down forested montane slopes. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Section: Discrete Element Methods Simulations Of Root Moundingmentioning

confidence: 99%

Section: Discrete Element Methods Simulations Of Root Moundingmentioning

confidence: 99%

Tree root mounds and their role in transporting soil on forested landscapes

Hoffman

Anderson

2013

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…The number of the two types of particles is chosen in order to have an equal volume fraction of all species. The coefficients of friction between the particles and the surface of the mold is considered to 0.5 [24], while the friction between particle-particle is set to 0.5 for the polymer powder HDPE (http://www.matbase.com/material-categories/ natural-and-synthetic-polymers). Other physical properties of material: Young's modulus, density of particles, Poisson ratio, thermal conductivity and specific heat are taken from experimental data on HDPE polymer powder (http://www.matbase.com/material-categories/ natural-and-synthetic-polymers).…”

Section: Simulation Configurationmentioning

confidence: 99%

Numerical simulation on the flow and heat transfer of polymer powder in rotational molding

et al. 2014

View full text Add to dashboard Cite

A numerical study is developed to predict of flow behavior and heat transfer processes during rotational molding of polymer powder by using Discrete Element Method (DEM). The aim of this study is to model different forms, the evolution of mixing and segregation and the evolution of heat transfers in polymer powder. Influence of physical and thermal properties on the granular flow and heat transfer are investigated though the numerical example of polymer powder HDPE.

show abstract

“…It has been shown that the most intense segregation occurred at fill fractions exceeding 65%. Chand, Khaskheli, Qadir, Ge, and Shi (2012) studied the radial segregation for a binary mixture inside a rotary drum. They reported that the radial segregation in a longer drum was higher than that in a shorter drum.…”

Section: Greek Lettersmentioning

confidence: 99%