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Simulation of spray coating in a spouted bed using recurrence CFD

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Particuology 2019年第1期17卷 92-103页

作者： Paul Kieckhefena Thomas Lichtenegger Swantje pietsch Stefan Pirker Stefan Heinrich Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology. HamburgGermany Department for Particulate Flow Modelling. Johannes Kepler university LinzAustria Linz Institute of Technology (LIT) Johannes Kepler UniversityLinzAustria

Although numerical models such as the computational fluid dynamics–discrete element method (CFD–DEM) have enabled the accurate simulation of laboratory-scale apparatuses, the application of these methods to large-scale apparatuses with many particles and time scales ranging from minutes to hours remains a challenge. The recently developed recurrence CFD (rCFD) method seeks to overcome these issues in pseudo-periodic processes by extrapolating globally recurring patterns in a physically meaningful way and describing the transport and interaction of passive scalars using Lagrangian tracers. Spouted beds represent an interesting target because of the associated variety of flow regimes. They can be effectively described by CFD–DEM on the time scale of tens of seconds, whereas industrially relevant processes typically take hours. In this contribution, we established the validity of applying the Lagrangian rCFD method to spouted beds by demonstrating the accurate reproduction of the particle residence time distribution in a fictitious spray zone. The deposition of spray droplets onto tracer particles was simulated for 1 h, and the particle surface coverage distribution was estimated using a statistical approach for both an unstabilized prismatic spouted bed and one stabilized by draft plates.

关键词： CFD–DEM Recurrence CFD Spray coating Time-scale decoupling Spouted bed Draft plate

The effect of microclimate on wood decay is indirectly altered by tree species diversity in a litterbag study

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Journal of Plant Ecology 2017年第1期10卷 170-178页

作者： David Eichenberg Katherina pietsch Christian Meister Wenyong Ding Mingjian Yu Christian Wirth Institut für Spezielle Botanik und Funktionelle Biodiversität University of LeipzigJohannisallee 21-23Leipzig 04103Germany College of Life Sciences Zhejiang University866 Yuhangtang RoadHangzhou 310058China German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5eLeipzig 04103Germany

Aims We studied the influence of tree species diversity on the dynamics of coarse wood decomposition in developing forest communities in a natural,topographically heterogeneous *** the litter bag technique,we investigated how and to which extent canopy tree species richness or the exclusion of mesoinvertebrates and macroinvertebrates affected wood decomposition in the light of natural variations in the *** compared the relative importance of the two aspects(experimental treatment versus microclimate)on wood decay rates using Schima superba as a standard *** Coarse woody debris(CWD)was deposited in litter bags with two different mesh sizes in a total of 134 plots along a gradient of canopy tree species richness(0-24 species).Wood decomposition was assessed at two consecutive time points,one and three years after deposition in the *** climatic conditions were assessed throughout the duration of the *** conditions were assessed both,directly in the field as well as indirectly via correlations with local *** used analysis of variance based approaches to assess the relative importance of the treatments(community tree species richness and macro invertebrate exclusion)and microclimatic conditions on wood *** Findings No direct influence of tree species richness on wood decay could be ***,the exclusion of macroinvertebrates significantly decreased wood decomposition *** addition,microclimatic conditions accounted for a substantial proportion of explained variance in the observed ***,wood decomposition was negatively affected by low mean temperatures and high variations in local humidity and ***,tree species richness as well as the respective species composition affected the presence of termites within forest ***,in turn,significantly increased the decay of *** strength of both,experimental treatment and microclimate increased with o

关键词： wood decomposition microclimate litter bag tree species diversity community composition

Particle formulation of hydroalcoholic rosemary (Rosmarinus officinalis L.) extracts using a spouted bed

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Particuology 2020年第4期18卷 26-34页

作者： D.Peshev E.Eichner M.Goslinska S.pietsch Y.Trambabova T.Terzieva N.Georgieva S.Heinrich Department of Chemical Engineering University of Chemical Technology and Metallurgy1576 SofiaBulgaria Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology21073 HamburgGermany Department of Biotechnology University of Chemical Technology and Metallurgy1576 SofiaBulgaria

In this study,spouted bed technology was applied to the protection and functionalization of polyphenolic rosemary ***,solid-liquid extraction was performed at 25℃with *** ethanol-water ratio was chosen to obtain high phenolic acid and diterpene concentrations in the *** selected solvent composition gave liquid extracts that could be directly added to a coating mixture for feeding into a spouted bed ***,no preliminary solvent exchange or evaporation of the extraction solvent to dryness was *** grade Paselli MD 6 maltodextrin and HiCap 100 modified starch were used as inert core and shell materials in the spouted bed encapsulation process under mild operating *** antioxidant activity of the fresh extract was retained during processing,which indicated that the active constituents were preserved and quantitatively transferred into the encapsulated formulations,which were readily soluble in *** obtained powders were composed of nearly spherical *** compositions,water solubilities,and particle morphologies make them a strong candidate for food and beverage applications as natural antioxidants,preservatives,or functional ingredients.

关键词： Particle Polyphenolic rosemary extract Encapsulation Spouted bed Bioactive Antioxidant

urinary bladder cancer as a late sequela of traumatic spinal cord injury

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Military Medical Research 2022年第1期9卷 21-31页

作者： Ralf Bthig Christian Tiburtius Wolfgang Schps Michael Zellner Oliver Balzer Birgitt Kowald Sven Hirschfeld Roland Thietje Aki pietsch Ines Kurze Martin Forchert Thura Kadhum Klaus Golka Department of Neuro-urology Centre for Spinal Cord InjuriesBG Klinikum Hamburg21033 HamburgGermany urological Practice 53757 Sankt AugustinGermany Department of urology and Neurourology Johannesbad Fachklinik94072 Bad FussingGermany Biomechanical Laboratory Centre for Spinal Cord InjuriesBG Klinikum Hamburg21033 HamburgGermany Centre for Spinal Cord Injuries BG Klinikum Hamburg21033 HamburgGermany Department of Sports and Rehabilitation Medicine BG Klinikum Hamburg21033 HamburgGermany Department of Paraplegiology and Neuro-urology Centre for Spinal Cord InjuriesZentralklinik Bad Berka Berka99437 Bad BerkaGermany Staff Position Accident Insurance Law Statutory Accident Insurance for Wood and Metal(BGHM)33602 BielefeldGermany Department of Psychosomatic Rehabilitation Mittelrheinklinik Fachklinik56154 Boppard-Bad SalzigGermany Clinical Occupational Medicine Leibniz Research Centre for Working Environment and Human Factors at TU Dortmund(IfADo)44139 Bothig et al.Mil Med Res 2021

Background:Traumatic spinal cord injury(SCI)is also a combat-related injury that is increasing in modern *** aim of this work is to inform medical experts regarding the different course of bladder cancer in able-bodied patients compared with SCI patients based on the latest medical scientific knowledge,and to present decision-making aids for the assessment of bladder cancer as a late sequela of traumatic ***:A study conducted between January 1998 and December 2019 in the BG Trauma Hospital Hamburg formed the basis for the decision-making *** bladder cancer was diagnosed in 40 out of 7396 treated outpatient and inpatient SCI *** patient information,latency period,age at initial diagnosis,type of bladder management and survival of SCI patients with bladder cancer were collected and analysed.T category,grading and tumor entity in these patients were compared with those in the general *** bladder cancer risk factors in SCI patients were ***,relevant published literature was taken into ***:Initial diagnosis of urinary bladder cancer in SCI patients occurs at a mean age of 56.4 years(SD±10.7 years),i.e.,approximately 20 years earlier as compared with the general *** bladder cancers are significantly more frequently muscle invasive(i.e.,T category≥T2)and present a higher grade at initial ***,SCI patients show a significantly higher proportion of the more aggressive squamous cell carcinoma than that of the general population in areas not endemic for the tropical disease ***,the survival time is extremely unfavourable.A very important finding,for practical reasons is that,in the Hamburg study as well as in the literature,urinary bladder cancer is more frequently observed after 10 years or more of *** on these findings,a matrix was compiled where the various influencing factors,either for or against the recognition of an associ

关键词： Traumatic spinal cord injury Neurogenic bladder Transitional cell carcinoma Squamous cell carcinoma Survival time Battlefield injury Medical assessment

Pressure Rise in Electrical Installations due to Internal Arcing in CO2 as Insulating Gas

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Journal of Energy and Power Engineering 2015年第6期9卷 548-555页

作者： Sebastian Wetzeler Yann Cressault Gerhard Johannes pietsch Loic Hermette Institute for High Voltage Technology RWTH Aachen University Aachen 52056 Germany Laboratoire Plasma et Conversion d'Energie Universite de Toulouse 3 Toulouse 31062 France Siemens SAS EM HP GS R&D DG CCB 1 rue de la Neva Grenoble BP 178 38004 France

Internal arcs cause a rapid increase in pressure in electrical installations. The type of insulation gas has influence on pressure development. Typically SF6 is used incompact metal-clad switchgear, however, it has a high global warming potential. Because of this, the replacement of SF6 by alternative gases such as CO2 is under discussion. The pressure developments in a closed vessel filled with air, SF6 and CO2 are measured and compared. During internal arcing in gas-insulated switchgear, overpressure causes a rupture of a burst plate and hot gas escapes into the surrounding room mixing with air. In order to predict the pressure development in electrical installations reliably, the portion of energy causing pressure rise, arc voltage as well as reliable gas data i.e., thermodynamic and transport properties, must be known in a wide range of pressure and temperature. These data are up to now not available for CO2/air mixtures. The thermodynamic properties are directly calculated from the number densities, internal partition functions and enthalpies of formation. The transport coefficients are deduced using the Chapman-Enskog method. Comparing measured and calculated pressure developments in a test arrangement demonstrates the quality of the calculation approach.

关键词： Pressure calculations internal arcing carbon dioxide.

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功能性纤维对家禽粪便质量和健康的影响

中国家禽 2015年第6期37卷 56-57页

作者： Manfred pietsch 刘一鸣德国JRS集团不详

由饲料原因引起的水便及其他健康问题给家禽养殖业带来负面影响。现有的研究显示,粗纤维浓缩物(CFC)对粪便质量和脚趾炎症的发生有积极作用。因此,研究者建议应在家禽饲料配方中添加纤维,并且主要是不溶性纤维。

关键词：家禽饲料纤维粪便干物质

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用电子束旋转盘法雾化活性金属及难熔金属

稀有金属材料与工程 1984年第2期 36-44页

作者： W.pietsch 左吉薇西德莱保尔德-海拉斯公司

引言在用作生产高质量金属粉末的技术中,有两种主要生产方法。惰性气体雾化法和旋转雾化法。惰性气体雾化法适用于不锈钢、工具钢和所谓超合金(Ni和Co基合金)。已有许多文献证明,旋转雾化法适用于活性金属、难熔金属和它们的合金。在利... 详细信息

引言在用作生产高质量金属粉末的技术中,有两种主要生产方法。惰性气体雾化法和旋转雾化法。惰性气体雾化法适用于不锈钢、工具钢和所谓超合金(Ni和Co基合金)。已有许多文献证明,旋转雾化法适用于活性金属、难熔金属和它们的合金。在利用旋转雾化的各类技术中,必须区分两种基本不同的方法(见图1)

关键词：旋转盘雾化法活性金属粉末颗粒

制球、压块及造粒研究用实验室机器的设计和应用

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浙江化工 1975年第Z1期 55-61页

作者： Wolfgang pietsch Horst Liebert 陆经武

扎要一种实验室用的辊式机器,其设计指导思想是:由简单而廉价的基本设备出发,增加某些特殊的辅助性部件的设计,来满足工业和科研实验室研究和发展的需要,这种多用途设备可应用于任何尺寸的放大。

关键词：机器辊式造粒制粒化工单元操作实验室压块造块

粗纤维浓缩物对肉鸡生产性能和水便控制的应用探讨

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中国家禽 2010年第17期32卷 48-49页

作者： Liu Jin Manfred pietsch Georg Dusel 刘一鸣(译) 高业雷(译) 德国宾根应用技术大学德国瑞登梅尔父子公司不详

水便综合征对家禽生产造成的的影响是巨大的。除了疾病，饲料质量、垫料和环境温度，包括通风都对粪便质量产生影响。其中，饲料的影响是主要因素之一。非淀粉多糖酶早就作为饲料添加剂应用于改善水便综合征，另外一个可能的途径是使用... 详细信息

水便综合征对家禽生产造成的的影响是巨大的。除了疾病，饲料质量、垫料和环境温度，包括通风都对粪便质量产生影响。其中，饲料的影响是主要因素之一。非淀粉多糖酶早就作为饲料添加剂应用于改善水便综合征，另外一个可能的途径是使用粗纤维浓缩物作为饲料添加剂，这在改善动物的粪便质量和生产性能方面已有先例。本文主要探讨粗纤维浓缩物对肉鸡生产性能和水便控制的效果。

关键词：肉鸡生产性能浓缩物粗纤维应用控制饲料添加剂水饲料质量