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Advances in Modeling of the Kerf Formation considering the Primary and Deflection Jets for the Abrasive Water Jet technology

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Procedia CIRP 2021年 102卷 156-161页

作者： Eckart Uhlmann Harald Kruggel-Emden Constantin Männel Enrico Barth Darius Markauskas Technische Universität Berlin Institute for Machine Tools and Factory Management (IWF) Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology (IPK) Pascalstr. 8-9 10587 Berlin Germany Technische Universität Berlin Mechanical Process Engineering and Solids Processing Ernst-Reuter-Platz 1 10587 Berlin

processing of difficult to machine materials is a promising application for abrasive water jet kerf cutting and milling. However, due to the large number of interactions of an energy-bound cutting process, a precise prediction of the material removal is crucial for its application. Based on an analytical approach, a material removal simulation model is introduced considering the primary and deflecting jet impacts to rapidly predict various cutting situations. The model describes fundamental cutting mechanisms considering the water jet’s material removal rate and is calibrated for titanium aluminides. The model allows for a comprehensive kerf prediction and thus potentially accelerates the process design improving the productivity and quality for abrasive water jet kerf cutting and milling.

关键词： Waterjet machining Titanium aluminides AWJ milling Modeling AWJ deflection

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Efficient Modeling of Bioreactors – From Lab Scale to Industrial Scale

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Chemie Ingenieur Technik 2022年第9期94卷

作者： J. Khinast P. Eibl C. Witz Graz University of Technology Institute of Process and Particle Engineering Inffeldgasse 13 8010 Graz Austria Simvantage GmbH Inffeldgasse 13 8010 Graz Austria

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A generalized framework for modeling the gas-phase in aerated stirred tanks using the Lattice-Boltzmann method

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Chemie Ingenieur Technik 2022年第9期94卷

作者： P. Eibl C. Witz J. Khinast Graz University of Technology Institute of Process and Particle Engineering Inffeldgasse 13 8010 Graz Austria Simvantage GmbH Inffeldgasse 13 8010 Graz Austria

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Using digital tools for enhanced student learning and engagement in particle technology courses at graz university of technology 46

Using digital tools for enhanced student learning and engage...

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46th SEFI Annual Conference 2018: Creativity, Innovation and Entrepreneurship for engineering Education Excellence

作者： Lepek, D. Radl, S. Chemical Engineering Cooper Union for the Advancement of Science and Art New YorkNY United States Institute of Process and Particle Engineering Graz University of Technology Graz Austria

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Experimental and numerical investigation of a three-dimensional prismatic spouted bed with liquid injection 8

Experimental and numerical investigation of a three-dimensio...

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Fluidization and Multiphase Flow 2018 - Topical at the 8th World Congress on particle technology

作者： Pietsch, Swantje Kieckhefen, Paul Miiller, Michael Schonherr, Michael Jager, Frank Kleine Heinrich, Stefan Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology Hamburg Germany BASFSE Ludwigshafen Germany

ISBN: (纸本)9781510869790

In this contribution, a three-dimensional prismatic spouted bed for coating purposes is investigated experimentally and numerically. Spouting behavior was experimentally investigated by means of Fourier transform of the pressure drop signal. The spouting stability could be increased by two parallel draft plates and influenced by using binary or ternary mixtures of different particle sizes. Simulations were performed with a coupled CFD-DEM approach, whereby droplets were injected in a post-processing step, which allowed the estimation of the liquid surface coverage of the used Y-AI2O3 particles. It was found that the insertion of draft plates results in a broader liquid distribution in the first ten seconds of the process. By applying the recurrence CFD (rCFD) method, the broader liquid distribution could be confirmed for a process duration of 1 hour. © 2018 Fluidization and Multiphase Flow 2018 - Topical at the 8th World Congress on particle technology. All rights reserved.

关键词： Binary mixtures

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Printability Enhancement and Tensile Property Improvement Via Developing in Situ Synthesized Carbon Nanotubes-Al Composite Powder

SSRN

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SSRN 2022年

作者： Cui, Jingyi Li, Shaofu Misra, R.D.K. Geng, Kang Kondoh, Katsuyoshi Li, Guanfeng Yang, Yafeng State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Science and Technology on Particle Materials Chinese Academy of Sciences China Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso 500 W. University Avenue El PasoTX79968 United States AVIC Manufacturing Technology Institute Beijing100024 China Joining and Welding Research Institution Osaka University Osaka Japan Northeastern University Faculty Sydney Smart Technology College Hebei066004 China

A strategy of powder surface functional modification involving in situ synthesizing carbon nanotubes (CNTs) on Al powder is described to address the poor forming ability and inferior mechanical properties of 3D printed Al parts. Coating CNTs on Al powder significantly reduced the laser reflectivity and enhanced the printability. CNTs contributed to reinforcement after printing and enhanced the tensile properties. The printing behavior of powder, the distribution of reinforcement, and tensile properties of printed samples were optimized by tuning the CNT-content. From the viewpoint of forming quality and strengthening capability of reinforcement, the CNT-content was optimized at 0.96 wt.%. An increase of 61% in the yield strength was achieved in the printed sample with ductility similar to the printed monolithic Al sample. © 2022, The Authors. All rights reserved.

关键词： Carbon nanotubes

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A Partitioned Scheme for Coupling of FEM and DEM Simulations of Granular Materials

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PAMM 2021年第1期21卷

作者： Amir Atrian Jorrid Lund Lars Radtke Vasyl Skorych Maksym Dosta Alexander Düster Ship Structural Design and Analysis Hamburg University of Technology 21073 Hamburg Germany Solids Process Engineering and Particle Technology Hamburg University of Technology 21073 Hamburg Germany

In this contribution, a simple uniaxial compaction of granular materials is considered in preparation for studying the collision behavior of double-hull vessels filled with granular materials. The top compressing plate is deformable and modeled by the finite element method (FEM). The particles modeled using the discrete element method (DEM) are compressed by the top plate. To this end, a partitioned technique to couple the continuum approach (FEM) and particle discretization (DEM) is presented. Full agreement of the computed reaction force in DEM with the pressure applied on the top plate in FEM implies accuracy of the used coupling technique.

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Filling process-induced tribo-charging of lubricated and non-lubricated gelatine and HPMC capsules

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Journal of Pharmaceutical Sciences 2025年第7期114卷 103781页

作者： Stankovic-Brandl, M. Zellnitz-Neugebauer, S. Wutscher, T. Biserni, S. Mercandelli, A. Kobler, M. Buttini, F. Andrade, L. Ecenarro, S. Paudel, A. Research Center Pharmaceutical Engineering (RCPE) GmbH Inffeldgasse 13 Graz 8010 Austria Graz University of Technology Institute for Process and Particle Engineering Inffeldgasse 13 Graz 8010 Austria MG2 Via del Savena 18 40065 Pian di Macina di Pianoro Bologna Italy Pharmadevices Via Barontini 18/2 Bologna 40138 Italy MEGGLE Excipients and Technology Megglestraße 6-12 Wasserburg am Inn 83512 Germany Food and Drug Department University of Parma Parco delle Scienze 27 Parma 43121 Italy Laboratorios Liconsa S.A. C/ El tejido 2 Guadalajara 19200 Spain Roquette Avda. Monte Valdelatas 4 28108 Alcobendas Madrid Spain

Tribo-charging can negatively affect pharmaceutical processes and the quality of pharmaceutical products. This study investigates electrostatic charging during the filling of hard capsules intended to be used in dry powder inhalers (DPIs). Gelatin and HPMC capsules without and with external lubricants (sodium lauryl sulfate, carnauba wax, and magnesium stearate) were subjected to automatic powder filling at two filling speeds and two humidities. Tribo-charging was compared among capsules and correlated with filling parameters using a lactose and 1 % budesonide formulation. Further, we evaluated the aerodynamic performance post-filling to determine the relation of the process-induced tribo-charging on in vitro performance. Our findings indicate that capsules exhibited lower levels of charge before processing. Post-filling, gelatin capsules exhibited lower charge compared to HPMC capsules. External lubricants decreased the charge for both types of capsules. At higher filling humidity (51 % RH), capsules generally exhibited lower charge uptake comparing the 22 % RH condition;higher filling speed tends to reduce charge uptake. However, no clear correlation between the charging of capsules during filling and aerodynamic performance was observed. processing seems to be more affected by the capsule surface properties (roughness and presence of surfactant), while the inhalation performance appears to be affected by the interplay of capsule material and process parameters (filling speed and humidity). © 2025 American Pharmacists Association

关键词： Capsule filling Inhalation processing Static charge Tribo-charging

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A study of the floatability and leaching behavior of eucryptite and eucryptite-containing slag

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Results in engineering 2025年

作者： Hao Qiu Haojie Li Michael Fischlschweiger Marko Ranneberg Torsten Graupner Sima Hellmers Arno Kwade Bengi Yagmurlu Department of Resource Processing Technologies Institute of Geotechnology and Mineral Resources Clausthal University of Technology 38678 Clausthal-Zellerfeld Germany Chair of Technical Thermodynamics and Energy Efficient Material Treatment Institute of Energy Process Engineering and Fuel Technology (IEVB) Clausthal University of Technology 38678 Clausthal-Zellerfeld Germany Federal Institute for Geosciences and Natural Resources (BGR) Stilleweg 2 30655 Hannover Germany Institute for Particle Technology (iPAT) Technische Universität Braunschweig Volkmaroder Str. 5 38104 Braunschweig Germany

With the application of pyrometallurgical technology in the recycling of spent lithium-ion batteries, eucryptite has been found as an artificial mineral in various lithium-bearing slags. Unlike spodumene, eucryptite has a higher lithium content and does not require high temperature roasting prior to leaching. Therefore, the study of the floatability and leaching behavior of eucryptite and eucryptite-containing slags is crucial for optimizing the pyrometallurgical recycling route of spent lithium-ion batteries. In this study, fundamental research is carried out on micro-flotation, surface property analysis and leaching behaviour of the natural eucryptite minerals. In micro-flotation tests, eucryptite showed a significant difference in floatability when using sodium oleate and dodecylamine. The disparity in yield between different minerals when employing the same collector serves as the foundation for selective flotation separation. A greater disparity indicates a higher expected efficiency in separation. In the dodecylamine system, eucryptite showed a higher yield compared to the gangue mineral gehlenite, with a maximum yield difference of approximately 35%. In addition, flotation tests on eucryptite-containing slag demonstrate the potential for separating eucryptite, γ-lithium aluminate and the gangue mineral gehlenite from slag by multi-stage flotation. In the leaching test, the leaching efficiency of lithium in the natural eucryptite mineral approaches 97% and in the slag approaches 100%.

关键词： Eucryptite Slag flotation Slag leaching Battery recycling Slag valorization Lithium recovery

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Fabrication of highly-filled composites by spouted bed coating and study of the influence of particle shape on mechanical properties of the materials 8

Fabrication of highly-filled composites by spouted bed coati...

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particle and Nanoparticle Functionalization 2018 - Topical at the 8th World Congress on particle technology

作者： Eichner, Eduard Dosta, Maksym Heinrich, Stefan Schneider, Gerold A. Institute of Solids Process Engineering and Particle Technology Hamburg Germany Institute of Ach'anced Ceramics Hamburg University of Technology Hamburg Germany

ISBN: (纸本)9781510869776

In this work the mechanical properties, as modulus of elasticity, strength and fracture toughness, of copper-composite materials was studied. The volume fraction of copper was between 60 and 83 %. The study was carried out with two types of composites. The first type were composites containing spherical copper particles. The second type were composites with copper particles, which were rolled before pressing to a bulk material. The analysis of fracture toughness shows, that the composites with spherical particles have the highest fracture toughness of 1.58 MPa-m,/2. The composites with higher aspect ratios of particles have the highest fracture toughness of 2.64 MPa-m,/2. It corresponds to an increasing over 65 % for the highest values of the toughness referred to composites with spherical particles. © 2018 particle and Nanoparticle Functionalization 2018 - Topical at the 8th World Congress on particle technology. All rights reserved.

关键词： Fracture toughness

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