Rheological and microstructural properties of elongated particles

Nathan Berry, Sina Haeri

Research output: Contribution to conferencePaperpeer-review

Abstract / Description of output

In this work, extensive numerical simulations of three dimensional, soft, elongated, monodispersed, non-cohesive particles are performed using a versatile Multi-Sphere Discrete Element Method. The particles are subjected to a homogeneous shear flow and a detailed analysis of their rheological and microstructural properties is undertaken. It is found that the rheological behaviour of these elongated particles is similar to that of spheres , with three clearly identifiable flow regimes namely the quasistatic, inertial and intermediate. However the effect of elongation is important. This is highlighted with the aspect ratio 1.5, which shows a significant dip in shear stress when compared to the other aspect ratios. To understand this dip, a thorough microstructural analysis is performed. A contact mode analysis is utilised, with the results showing that the proportion of contact type is highly dependent on aspect ratio and volume fraction, however it has very low dependence on shear rate. Using Voronoi tessellations, a measure of compactness of the material is defined. This parameter uncovered unusual behaviour with respect to aspect ratio 1.5, with noticeable peaks in compactness across regimes. Despite the interesting results gathered from the aforementioned analysis, further work including a break down of the force networks is performed to conclusively understand the rheological properties observed.
Original languageEnglish
Publication statusPublished - 28 Oct 2019
EventVI International Conference on Particle-Based Methods - Barcelona, Spain
Duration: 28 Oct 201930 Oct 2019
https://congress.cimne.com/particles2019/frontal/default.asp

Conference

ConferenceVI International Conference on Particle-Based Methods
Abbreviated titleParticles 2019
Country/TerritorySpain
CityBarcelona
Period28/10/1930/10/19
Internet address

Keywords / Materials (for Non-textual outputs)

  • rheological properties
  • microstructural properties
  • elongated particles

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