A Primer on CFD-DEM for Polymer-Filled Suspensions

Fernandes, Célio; Ferrás, Luís Jorge Lima; Afonso, A.M.

doi:10.3390/app13042466

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Furthermore, it is proposed that the particle property parameters determine the morphology and stability of the force chain, and the complex dynamic response of the force chain network determines the macroscopic mechanical properties of the system, thus constructing a cross-scale correlation of the macro–meso–micro-mechanical behavior of the particulate matter system. At present, computational fluid dynamics–discrete element method (CFD–DEM) coupling − has been used to study the rheological properties of suspension, , the aggregation behavior of particles in the flow field, , and the obstruction effect on the flow field, , and the stability of the structure of the particle system has been judged by the force chain evolution process, − which proves the importance of the force chain network structure in the gel system and the particle system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior Analysis of Wax Crystals during Crude Oil Gelation

Dong

Zhao

et al. 2023

ACS Omega

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The motion behaviors, rheological properties, and mechanical properties of a wax crystal mesoscale force chain network of waxy crude oil during gelation were experimentally studied and simulated by rheo-optic in situ measurement and computational fluid dynamics–discrete element method (CFD–DEM) numerical simulation, respectively. The motion behavior characteristics of wax crystals and the changes in the average coordination number of wax crystal networks were obtained at different temperatures. The study investigates the rule of crude oil rheological deterioration, the increase of wax crystals, and the changes in wax crystal motion behaviors with decreasing temperature. The relationship between the structure of the mesoscale force chain of the wax crystal network and the motion behaviors of the wax crystal and its rheological properties was analyzed. The results show that the average motion velocity of wax crystals or aggregates decreases from 28.48 to 22.56 μm/s when the temperature decreases from wax appearance temperature (48 °C) to 25 °C. The rotation and rolling trend of wax crystals gradually flatten, and the average coordination number increases 4.39 times. The viscosity of waxy crude oil increases from 6.27 to 8369.7 mPa·s, and the average coordination number of wax crystals obtained by CFD–DEM also increases significantly, which confirms the experimental results. We also found that when the system tended to gelation, a complex and stable force chain network was formed between the wax crystals, with a force chain coverage of 87.93% and a significant increase in the pressure drop in the flow field, which is consistent with the variation pattern of the system viscosity. The micro–meso-dynamic behavior analysis of waxy crude oil combined with CFD–DEM coupling provides a new way to explore the rheological properties of waxy crude oil and the microscopic mechanism of its modification.

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