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| 1 | Sedimentation acceleration of remanent iron oxide by magnetic flocculation显示文摘Sedimentation based processes are widely used in industry to separate particles from a liquid phase. Since the advent of the 'Nanoworld' the demand for effective separation technologies has rapidly risen, calling for the development of new separation concepts, one of which lies in hybrid separation using the superposition of a magnetic field for magnetic particles. Possible product portfolio of such separation consists of pigment production, nanomagnetics production for electronics and bio separation. A promising step in that direction is magnetic field enhanced cake filtration, which has by now progressed from batch to continuous operation. In sedimentation processes in a mass force field the settling behaviour of particles strongly depends on physico-chemical properties, concentration and size distribution of the particles. By adjusting the pH, the interparticle forces, in particular the electrostatic repulsion, can be manipulated. For remanent magnetic particles such as magnetite, pre-treatment in a magnetic field could lead to a change of interparticle interactions. By magnetizing the particles apart from van der Waals attraction and electrostatic repulsion, an additional potential is induced, the magnetic attraction, which could easily dominate the other potentials and result in agglomeration in the primary minimum. By sedimentation analysis, a wide spectrum of parameters like pH, magnetic field strength and concentration have been investigated. The results show a strong increase of sedimentation velocity by magnetic flocculation of the raw suspension. This leads to a rise in throughput due to the acceleration of sedimentation kinetics by imparting a non-chemical interaction to the physico-chemical properties in the feed stream of the separation apparatus. | Mathias Stolarski Christian Eichholz Benjamin Fuchs Hermann Nirschl | 2007 | China Particuology2007，5，1： | 12 |
| 2 | Influence of the magnetic force on the van der Waals force of superparamagnetic composite particles显示文摘 | Johannes Knoll Hermann Nirschl | 2014 | Powder Technology2014，，： | 1 |
| 3 | Multiphase CFD simulation of a solid bowl centrifuge显示文摘 | Xiana Romaní Fernández Hermann Nirschl | | 0，，： | 1 |
| 4 | OVERLAPPING GRIDS FOR THE SIMULATION OF PARTICLE INTERACTION AT THE MICRO SCALE显示文摘This paper describes the use of overlapping grids for the calculation of flow around single and multiple-particle configurations at the micro scale. The basic equations for calculation are those for conservation of mass and momentum which are solved using a common Finite-Volume formulation. The hydrodynamic particle-particle and particle-wall interaction can be calculated by using an overlapping or Chimera grid scheme. With the grid structuring procedure it is possible to use simple and structured grids around the particles and the overall main grid geometry. The particle grids are lapped over the main grid such that they can move independently after each time step without remeshing the whole geometry. The paper gives results for the validation of the code developed for general test cases, for a rotating ellipsoid in simple shear flow, the flow around particles attached to a wall, the motion of a particle in the vicinity of a wall and some results for the flow through a packed bed configuration. | Hermann Nirschl | 2005 | China Particuology2005，3，1： | 1 |
| 5 | A discrete contact model for complex arbitrary-shaped convex geometries显示文摘The shape of particles has a significant influence on the behavior of suspensions,as the particle-fluid,particle-particle,and particle-wall interactions depend on it.However,the simultaneous consideration of complex particle shapes and four-way coupling remains a major challenge.This is mainly due to a lack of suitable contact models.Contact models for complex shapes have been proposed in literature,and most limit the accuracy of the particle-fluid interaction.For this reason,this paper presents a novel contact model for complex convex particle shapes for use with partially saturated methods,in which we propose to obtain necessary contact properties,such as the indentation depth,by a discretization of the contact area.The goal of the proposed model is to enable comprehensive and accurate studies of particulate flows,especially with high volume fractions,that lead to new insights and contribute to the improvement of existing industrial processes.To ensure correctness and sustainability,we validate the model extensively by studying cases with and without fluid.In the latter case,we use the homogenized lattice Boltzmann method.The provided investigations show a great agreement of the proposed discrete contact model with analytical solutions and the literature. | Jan E.Marquardt Ulrich J.Römer Hermann Nirschl Mathias J.Krause | 2023 | Particuology2023，，9： | 0 |
| 6 | Simulating orthokinetic heterocoagulation and cluster growth in destabilizing suspensions显示文摘 | Fabian Billow Hermann Nirschl Willy Dorfler | 2017 | Particuology2017，15，2： | 0 |
| 7 | Particle flow simulations with homogenised lattice Boltzmann methods显示文摘 | Mathias J. Krause Fabian Klemens Thomas Henn Robin Trunk Hermann Nirschl | 2017 | Particuology2017，15，5： | 0 |
| 8 | Modified shear cell for characterization of the rheological behavior of particulate networks under compression显示文摘Knowledge of the rheological behavior of saturated particulate networks is crucial for every process in which a particulate network is built-up,dewatered,or transported,as in a decanter centrifuge.However,difficulties arise as to how to characterize the material properties.Thus far,no standardized method or measurement device has prevailed.In this work,the requirements for a useful device are discussed,followed by the design of a modified shear cell for a Schulze ring shear tester RST-01.pc and its measurement procedure.Shear experiments under normal load with different sediments consisting of inorganic and organic particles whose material properties strongly affect the rheological behavior were performed.The results demonstrate the potential of the modified shear cell.Furthermore,current challenges in characterization are discussed.The characterization possibilities of the developed shear cell are a further step toward understanding the theological behavior of liquid-saturated particulate networks. | Simon Hammerich Anthony D.Stickland Benjamin Radel Marco Gleiss Hermann Nirschl | 2020 | Particuology2020，18，4： | 0 |
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