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Mixed-conducting ceramic–carbonate membranes exhibiting high CO2/O2 permeation flux and stability at high temperatures

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journal of Advanced Ceramics 2020年第1期9卷 94-106页

作者： R.ORTEGA-LUGO j.a.fabian-anguiano O.OVALLE-ENCINIA C.GOMEZ-YANEZ B.H.ZEIFERT j.ORTIZ-LANDEROS Instituto Politécnico Nacional Escuela Superior de Ingeniería Química e Industrias ExtractivasDepartamento de Ingeniería en Metalurgia y MaterialesUPALM-ZacatencoMexico City 07738Mexico Chemical Engineering School for Engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287-6106USA

This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ***,it is reported the simultaneous CO2/O2 permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases,wherein the microstructure of the ceramic part is composed,in turn,of a mixture of fluorite and perovskite *** ceramics showed ionic and electronic conduction,and at the operation temperature,the carbonate phase of the membranes is in liquid state,which allows the transport of CO32-and O2–species via different *** fabricate the membranes,the ceramic powders were uniaxially pressed in a disk ***,an incipient sintering treatment was carried out in such a way that a highly porous ceramic was ***,the piece is densified by the infiltration of molten *** of the membranes was accomplished by SEM,XRD,and gas permeation techniques among *** and chemical stability under an atmosphere rich in CO2 was ***2/O2 permeation and long-term stability measurements were conducted between 850 and 940℃.The best permeation–separation performance of membranes of about 1 mm thickness,showed a maximum permeance flux of about 4.46×10^–7 mol·m^–2·s^–1·Pa^–1 for CO2 and 2.18×10^–7 mol·m^–2·s^–1·Pa^–1 for O2 at 940℃.Membranes exhibited separation factor values of 150–991 and 49–511 for CO2/N2 and O2/N2 respectively in the studied temperature *** long-term stability test showed certain microstructural changes in the membranes,no significant detriment on the permeation properties was observed along 100 h of continuous operation.

关键词： CO2 separation O2 separation ceramic–carbonate membrane selectivity

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Wetting and its influence on the filtration ability of ceramic foam filters

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Particuology 2015年第1期13卷 50-57页

作者： fabian Heuzeroth j?rg Fritzsche Urs A.Peuker Institute of Mechanical Process Engineering and Mineral Processing

Deep bed filtration in aqueous media is a well-known process for solid-liquid separation. However, the use of deep bed filtration for the purification of metal melts is a relatively new field of application, In particular, the separation mechanism of metal melts filtration is a new area for investigation. The current paper aims at examining the influence of wetting on the filtration efficiency of ceramic foam filters that is an important feature of the metal melts filtration process. A model system was designed using water and alumina particles （〈200μm）. The particles and filter medium were coated to model poor wetting. Thus, examination of the influence of wetting on the adhesion energy and filtration performance was possible. Furthermore, the effect of fluid velocity was studied. To this end, the experiments were carried out under atmospheric conditions and at 20℃. The findings showed that poor wetting between the fluid and solid phase significantly increased the filtration efficiency.

关键词： Deep bed filtration Adhesion energy Atomic force microscopy Wetting

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A Eulerian population balance/Monte Carlo approach for simulating laminar aluminum dust flames

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Particuology 2024年第5期88卷 323-343页

作者： fabian Sewerin jannis Finke Emmy Noether Group for Dispersed Multiphase Flows Chair of Mechanical Process EngineeringOtto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany

Recently,metal powders have been conceptualized as carbon-free recyclable energy carriers that may form a cornerstone of a sustainable energy *** combustion of metal dusts in oxidizing atmospheres is exothermal and yields oxide particles that could,potentially,be retrieved and,subsequently,recharged by conversion to pure metals using green primary energy *** a step towards a predictive tool for designing metal dust combustors,we present a fully Eulerian modelling approach for laminar particle-laden reactive flows that is,conceptually,based on a population balance description of the dispersed particles and relies on a stochastic Eulerian solution *** the population balance equation(PBE)is formulated for the number-weighted distribution of characteristic properties among all particles near a spatial location,it is kinetically informed by the rates at which mass,momentum and heat are exchanged between the carrier gas and the particulate phase on the single particle *** the scope of the Eulerian Monte Carlo solution scheme,the property distribution is discretely represented in terms of the total number density and a finite number of property samples and the computational work is channelled towards the Eulerian estimation of mean particle *** the case of reactive aluminum particles,we combine a kinetic description of the gas-particle heat and mass transfer with a transport-limited continuum formulation to obtain rate expressions that are valid across the entire particle size range from the free molecular through the continuum *** velocity,the particle properties include only the particle mass,temperature and oxide mass *** set of thermochemical degrees of freedom is retained also as phase transitions due to melting occur,drawing on a smooth blend of the solid and liquid thermodynamic and material *** particle-level formulation encompasses aluminum evaporation,surface oxidation,scavenging of oxi

关键词： Metal dust combustion Aluminum Population balance Eulerian Monte Carlo

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Investigation of grain mass flow in a mixed flow dryer

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Particuology 2014年第1期12卷 33-39页

作者： fabian Weigler jochen Mellmann Department of Post-harvest Technology Leibniz Institute for Agricultural Engineering Potsdam-Bornim

The numerical modeling of grain drying is a topic of great relevance to post-harvest engineering. The required type of drying process depends on the quantity of grain to be dried and the required quality of the grain. The choice of the drying system depends on the operating parameters of the drying process. The granular flow pattern of the material exerts a significant influence on the drying process. Post-harvest drying of grain is essential for better storage, handling, and processing. Therefore, it is important to know the material behavior that controls the particle flow patterns of grain in the drying equipment to guarantee the product quality and to optimize the drying process conditions. The discrete element method （DEM） was applied to investigate the particle flow pattern of wheat through a mixed-flow dryer （MFD） without airflow, and the findings were compared with experimental results in this work. The investigations were performed using dry wheat with 14 wb% moisture content.

关键词： Keywords:Mixed-flow dryerGrain mass flowDiscrete element method

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Particle flow simulations with homogenised lattice Boltzmann methods

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Particuology 2017年第5期15卷 1-13页

作者： Mathias j. Krause fabian Klemens Thomas Henn Robin Trunk Hermann Nirschl Institute for Applied and Numerical Mathematics Karlsruhe Institute of Technology 76021 Karlsruhe Germany Institute for Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology 76021 Karlsruhe Germany

An alternative approach to simulating arbitrarily shaped particles submersed in viscous fluid in two dimensions is proposed, obtained by adapting the velocity parameter of the equilibrium distribution function of a standard lattice Boltzmann method （LBM）. Comparisons of exemplifying simulations to results in the literature validate the approach as well as the convergence analysis. Pressure fluctuations occurring in Ladd＇s approach are greatly reduced. In comparison with the immersed boundary method, this approach does not require cost intensive interpolations. The parallel efficiency of LBM is retained. An intrinsic momentum transfer is observed during particle-particle collisions. To demonstrate the capa- bilities of the approach, sedimentation of particles of several shapes is simulated despite omitting an explicit particle collision model.

关键词： Particulate flow simulationsArbitrarily shaped particlesLattice Boltzmann methodsValidationSedimentation processes

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Influence of the number of flights on the dilute phase ratio in flighted rotating drums by PTV measurements and DEM simulations

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Particuology 2021年第3期19卷 171-182页

作者： Lanyue Zhang Zhaochen jiang jochen Mellmann fabian Weigler fabian Herz Andreas Bück Evangelos Tsotsas Department of Postharvest Technology Leibniz Institute for Agricultural Engineering and BioeconomyMax-Eyth-Allee 100Potsdam 14469Germany Thermal Process Engineering Otto von Guericke University MagdeburgUniversitaetsplatz 239106 MagdeburgGermany Institute of Particle Technology(LFG) FAU Erlangen-NurembergCauerstr.491058 ErlangenGermany Department of Applied Biosciences and Process Engineering Anhalt University of Applied SciencesBernburgerStr.5506366 KoethenGermany

Particle distribution in the cross-section of the flighted rotating drum(FRD)is critical to the analysis of heat and mass transfer between gas and *** this work,the particle tracking velocimetry(PTV)method is applied to study the influence of the number of flights on the particle motion in *** drum,installed with 1,4,8,or 12 rectangular flights,is filled with plastic balls to 15%and operated at various rotating speeds ranging from 10 rpm to 30 *** results show that the number of flights has different effects on the holdup ratio and cascading rate of single flight and active *** 8 and 12 flights,the FRD produces a larger and more stable particle ratio of the dilute ***,DEM simulations agree with PTV measurements,whereas literature models show significant deviations.

关键词： Flighted rotating drum Number of flights Dilute phase PTV DEM

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Simulating orthokinetic heterocoagulation and cluster growth in destabilizing suspensions

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Particuology 2017年第2期15卷 117-128页

作者： fabian Billow Hermann Nirschl Willy Dorfler Institute of Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology 76131 Karlsruhe Germany Institute for Applied and Numerical Mathematics Karlsruhe Institute of Technology 76131 Karlsruhe Germany

Using direct numerical simulation, we investigate the coagulation behavior of non-Brownian colloidal particles as exemplified by Al2O3 particles. This yields the so-called capture efficiency, for which we give an analytical expression, as well as other time-dependent variables such as the cluster growth rate. Instead of neglecting or strongly approximating the hydrodynamic interactions between particles, we include hydrodynamic and non-hydrodynamic interactions in a Stokesian dynamics approach and a comprehensive modeling of the interparticle forces. The resulting parallelized simulation framework enables us to investigate the dynamics of polydisperse particle systems composed of several hundred particles at the same high level of modeling we used for a close investigation of the coagulation behavior of two unequal particles in shear flow. Appropriate cluster detection yields all the information about large destabilizing systems, which is needed for models used in flow-sheet simulations. After non-dimensionalization, the results can be generalized and applied to other systems tending to secondary coagulation

关键词： Destabilization Coagulation Capture efficiency Al2O3 Cluster detection Stokesian dynamics

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Capillaric field effect transistors

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Microsystems & Nanoengineering 2022年第2期8卷 59-71页

作者： Claude Meffan julian Menges fabian Dolamore Daniel Mak Conan Fee Renwick C.j.Dobson Volker Nock Department of Electrical and Computer Engineering University of CanterburyChristchurch 8041New Zealand Department of Microengineering Kyoto University615-8540 KyotoJapan School of Biological Sciences University of CanterburyChristchurch 8041New Zealand Biomolecular Interaction Centre School of Biological SciencesUniversity of CanterburyChristchurch 8041New Zealand School of Product Design University of CanterburyChristchurch 8041New Zealand Department of Biochemistry and Molecular Biology Bio21 Molecular Science and Biotechnology InstituteUniversity of MelbourneParkvilleVIC 3010Australia The MacDiarmid Institute for Advanced Materials and Nanotechnology Wellington 6140New Zealand

Controlling fluid flow in capillaric circuits is a key requirement to increase their uptake for assay *** action off-valves provide such functionality by pushing an occluding bubble into the channel using a difference in capillary ***,we utilized the binary switching mode of this structure to develop a powerful set of fundamental fluidic valving *** this work,we study the transistor-like qualities of the off-valve and provide evidence that these structures are in fact functionally complementary to electronic junction field effect *** view of this,we propose the new term capillaric field effect transistor to describe these types of *** support this conclusion,we present a theoretical description,experimental characterization,and practical application of analog flow resistance *** addition,we demonstrate that the valves can also be *** show modulation of the flow resistance from fully open to pinch-off,determine the flow rate-trigger channel volume relationship and demonstrate that the latter can be modeled using Shockley's equation for electronic ***,we provide a first example of how the valves can be opened and closed repeatedly.

关键词： transistors effect field

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Interactive map reports summarizing bivariate geographic data

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Visual Informatics 2019年第1期3卷 27-37页

作者： Shahid Latif fabian Beck University of Duisburg–Essen paluno–The Ruhr Institute of Software TechnologyGermany

Bivariate map visualizations use different encodings to visualize two variables but comparison across multiple encodings is *** to a univariate visualization,it is significantly harder to read regional differences and spot geographical *** targeting inexperienced users of visualizations,we advocate the use of natural language text for augmenting map visualizations and understanding the relationship between two geo-statistical *** propose an approach that selects interesting findings from data analysis,generates a respective text and visualization,and integrates both into a single *** generated reports interactively link the visualization with the textual *** can get additional explanations and have the ability to compare different *** text generation process is flexible and adapts to various geographical and contextual settings based on small sets of *** showcase this flexibility through a number of application examples.

关键词： Geographic visualization Natural language generation Interactive documents

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Histopathological assessment of the microscopic activity in inflammatory bowel diseases:What are we looking for?

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World journal of Gastroenterology 2022年第36期28卷 5300-5312页

作者： Ondrej fabian Lukas Bajer Clinical and Transplant Pathology Centre Institute for Clinical and Experimental MedicinePrague 14021Czech Republic Department of Pathology and Molecular Medicine 3rd Faculty of MedicineCharles University and Thomayer HospitalPrague 14059Czech Republic Hepatogastroenterology Department Institute for Clinical and Experimental MedicinePrague 14021Czech Republic Institute of Microbiology Czech Academy of SciencesPrague 14220Czech Republic

Advances in diagnostics of inflammatory bowel diseases(IBD)and improved treatment strategies allowed the establishment of new therapeutic ***,it is desirable not only to cease clinical symptoms,but mainly to achieve endoscopic remission,a macroscopic normalization of the bowel ***,up to one-third of IBD patients in remission exhibit persisting microscopic activity of the *** evidence suggests a better predictive value of histology for the development of clinical complications such as clinical relapse,surgical intervention,need for therapy escalation,or development of colorectal *** proper assessment of microscopic inflammatory activity thus became an important part of the overall histopathological evaluation of colonic biopsies and many histopathological scoring indices have been ***,a majority of them have not been validated and no scoring index became a part of the routine bioptic *** review summarizes a predictive value of microscopic disease activity assessment for the subsequent clinical course of IBD,describes the most commonly used scoring indices for Crohn's disease and ulcerative colitis,and comments on current limitations and unresolved issues.

关键词： Crohn’s disease Microscopy Predictor Score Ulcerative colitis

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