Spreading of granular pastes: from the particle to end use properties
Final Report Abstract
Pastes are highly concentrated particle suspensions which are important for many products in the chemical and food industries. The aim of this research project was to describe the complex rheological properties of pastes using physical based models to predict the spreading behaviour by the mechanical vibration. The spreading behaviour of pastes was investigated in the cooperation project using experimental and numerical methods. New measurement methods were developed to determine the particulate interactions in the fluid in order to obtain the parameters of the contact models for the Discrete Element Method (DEM). The influence of the fluid and the surface roughness of particles and apparatus walls on the restitution coefficient of microparticles was investigated experimentally and the Davis model for the "wet" restitution coefficient as a function of the Stokes number was extended with measurable parameters of the surface roughness. Furthermore, a new method was developed for parameter determination and validation of the DEM in order to apply marking points to microparticles for rotation determination. The calibration of friction and cohesion parameters was realised by measuring the angle of repose in the fluid. The rheological behaviour of particulate pastes was investigated experimentally with rheometer measurements and numerically with coupled CFD-DEM simulations. The flow functions of pastes made of glycerine and glass beads as well as pastes with Al2O3 and TiO2 particles were measured for different particle concentrations. The results of coupled CFD-DEM simulations explained the thixotropic flow behaviour of pastes by the particle movement and segregation. The spreading behaviour of glass beads on a vibrating plate was investigated for the dry case and for pastes. In the dry case, the final angle of repose depends on the applied vibration energy. By increasing the amplitude, the stationary angle of repose is reached more quickly. The DEM simulations showed that a shear band is created on the outer area of the pile during vibration, which leads to tangential particle movement. The investigations of pastes under vibration showed that the mechanical vibration energy that is needed for spreading of the paste decreases with increasing liquid content. By implementing a new dynamic liquid bridge model in the DEM, it was possible to reproduce the experimental spreading behaviour and investigate the contact behaviour of particles during vibration. Based on the simulations, the minimum vibration energy at which the spreading of the paste begins was determined.
Publications
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Diafiltration of Highly Concentrated Suspensions with Fine Particles by Dynamic Disk Filtration. Chemical Engineering & Technology, 44(12), 2191-2198.
Goldnik, Denis; Lösch, Philipp; Ripperger, Siegfried; Nikolaus, Kai & Antonyuk, Sergiy
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Influence of the surface roughness on the collision behavior of fine particles in ambient fluids. Powder Technology, 392, 58-68.
Krull, Fabian; Mathy, Julia; Breuninger, Paul & Antonyuk, Sergiy
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Prediction of random packing density and flowability for non-spherical particles by deep convolutional neural networks and Discrete Element Method simulations. Powder Technology, 393, 559-581.
Hesse, Robert; Krull, Fabian & Antonyuk, Sergiy
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An in-depth analysis of particle piles under vibration using the discrete element method, International Congress of Chemical and Process Engineering CHISA 2022, Prague, 21.08.2022-25.08.2022
Krull, F., Marouazi, G., Kiesgen De Richter, S. & Antonyuk, S.
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Discharge of vibrated granular silo: A grain scale approach. Powder Technology, 397, 116998.
Pascot, Arthur; Morel, Jean-Yves; Antonyuk, Sergiy; Jenny, Mathieu; Cheny, Yoann & Kiesgen, De Richter Sébastien
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Experimental study of granular heap flow under vertical vibrations, 10th International Conference for Conveying and Handling of Particulate Solids CHoPS, Salerno, 05.07.2022-09.07.2022
Marouazi, G., Krull, F., Antonyuk, S. & Kiesgen De Richter, S.
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Simulation of solid-liquid separation processes: Challenges in modeling and experimental validation, Keynote lecture, FILTECH 2022, 08.03.2022-10.03.2022
Krull F. & Antonyuk S.
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Spreading behaviour of particle piles under vibration: Experiments and DEM simulations, World Congress on Particle Technology WCPT 9, Madrid, 18.09.2022-22.09.2022
Krull, F., Marouazi, G., Kiesgen De Richter, S. & Antonyuk, S.
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Description of particle interactions in solid-fluid separation processes by CFD- DEM coupling method. Keynote lecture on the International congress FILTECH 2023, Cologne, 14.02.-16.02.2023
Antonyuk, S.
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Improving flowability of granular flows down inclines using vibrations and small particles as lubricants. Powder Technology, 416, 118219.
d.’Ambrosio, Enzo; Gaudel, Naïma & Kiesgen, de Richter Sébastien
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Measurements of micro particle rotation by applying marking points using additive manufacturing tools. Advanced Powder Technology, 34(11), 104218.
Krull, Fabian; Strohner, David; Hering-Stratemeier, Julian; von Freymann, Georg & Antonyuk, Sergiy
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Physics-informed neural networks for gravity currents reconstruction from limited data. Physics of Fluids, 35(2).
Delcey, Mickaël; Cheny, Yoann & Kiesgen, de Richter Sébastien
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Spreading behavior of wetted particle heaps under vibration: Experimental study and DEM simulation, International Congress on Particle Technology PARTEC2023, Nürnberg, 26.09.2023-28.09.2023
Krull, F., Marouazi, G., Kiesgen De Richter, S. & Antonyuk, S.
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Influence of the liquid content of the spreading behaviour of particle piles under vibration, Jahrestreffen der VDI/DECHEMA-Fachgruppe Agglomerations- und Schüttguttechnik 2024, Weimar, 05.03.2024-07.03.2024
Krull, F., Kiesgen De Richter, S. & Antonyuk, S.
