A dissipative particle dynamics model for thixotropic materials exhibiting pseudo-yield stress behaviour
Article
Article Title | A dissipative particle dynamics model for thixotropic materials exhibiting pseudo-yield stress behaviour |
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ERA Journal ID | 5148 |
Article Category | Article |
Authors | Le-Cao, K. (Author), Phan-Thien, N. (Author), Khoo, B. C. (Author) and Mai-Duy, N. (Author) |
Journal Title | Journal of Non-Newtonian Fluid Mechanics |
Journal Citation | 241, pp. 1-13 |
Number of Pages | 13 |
Year | 2017 |
Place of Publication | Netherlands |
ISSN | 0377-0257 |
1873-2631 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jnnfm.2017.01.004 |
Web Address (URL) | http://www.sciencedirect.com/science/article/pii/S0377025716301446 |
Abstract | Many materials (e.g., gels, colloids, concentrated cohesive sediments, etc.) exhibit a stable solid form at rest, and liquify once subjected to an applied stress exceeding a critical value – a yield-stress behaviour. This can be qualitatively explained by the forming and destruction of the fluid microstructure [1], and it may be modelled as a thixotropic and yield stress material. In this paper, we propose a mesoscopic model which is able to mimic a thixotropic and yield stress behaviour using a particle-based technique known as dissipative particle dynamics (DPD). The DPD technique satisfies conservation of mass and momentum and it has been applied successfully for a number of problems involving complex-structure fluids, such as polymer solutions, suspensions of rigid particles, droplets, biological fluids, etc. In this work, an indirect linkage dissipative particle model (ILDP) is proposed based on qualitative microstructural physics, which results in a non-Newtonian fluid with observed yield stress and thixotropic properties. The model comprises of two types, or species, of DPD particles – with only repulsive conservative force between the same species, and with repulsive force at short range and attractive force at long range between different species. Numerical results show that the proposed DPD fluid can represent some observed complex behaviours, such as yield stress and thixotropic effects. |
Keywords | dissipative particle dynamics; DPD; Bingham model; yield stress; Thixotropy |
ANZSRC Field of Research 2020 | 490399. Numerical and computational mathematics not elsewhere classified |
401706. Numerical modelling and mechanical characterisation | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | National University of Singapore |
School of Mechanical and Electrical Engineering | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3wyw/a-dissipative-particle-dynamics-model-for-thixotropic-materials-exhibiting-pseudo-yield-stress-behaviour
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