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Detailed modeling of aluminum particle combustion——From single particles to cloud combustion in Bunsen flames

Chinese Journal of Aeronautics 2022年第5期35卷 319-332页

作者： Jiarui ZHANG Oliver T.STEIN Tien D.LUU Ali SHAMOONI Zhixun XIA Zhenbing LUO Likun MA Yunchao FENG andreas kronenburg College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China Institut für Technische Verbrennung Universitat StuttgartStuttgart 70174Germany

A numerical model for aluminum cloud combustion which includes the effects of interphase heat transfer,phase change,heterogeneous surface reactions,homogeneous combustion,oxide cap growth and radiation within the Euler–Lagrange framework is *** model is validated in single particle configurations with varying particle *** combustion process of a single aluminum particle is analyzed in detail and the particle consumption rates as well as the heat release rates due to the various physical/chemical sub-models are *** combustion time of single aluminum particles predicted by the model are in very good agreement with empirical correlations for particles with diameters larger than 10μ*** prediction error for smaller particles is noticeably reduced when using a heat transfer model that is capable of capturing the transition regime between continuum mechanics and molecular *** predictive capabilities of the proposed model framework are further evaluated by simulating the aluminum/air Bunsen flames of Mc Gill University for the first *** show that the predicted temperature distribution of the flame is consistent with the experimental data and the double-front structure of the Bunsen flame is reproduced *** burning rates of aluminum in both single particle and particle cloud configurations are calculated and compared with empirical *** show that the burning rates obtained from the present model are more reasonable,while the correlations,when embedded in the Euler–Lagrange context,tend to underestimate the burning rate in the combustion stage,particularly for the considered fuel-rich flames.

关键词： Aluminum particle combustion Bunsen flame Burning time Burning rate Particle cloud

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铝颗粒粉尘对冲火焰数值模拟研究

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物理学报 2022年第7期71卷 229-240页

作者：张家瑞夏智勋方传波马立坤冯运超 Oliver Stein andreas kronenburg 国防科技大学空天科学学院长沙410073 清河大楼丁–3 北京100085 斯图加特大学燃烧技术研究所斯图加特70569

铝颗粒由于具有能量密度高、易储存、燃烧过程不产生温室气体等优势,有望成为未来化石燃料替代的解决方案.本文建立了铝颗粒粉尘火焰的燃烧模型,其中考虑了相间传热、相变、表面化学反应、气相详细化学反应及辐射传热等过程,并针对铝颗... 详细信息

铝颗粒由于具有能量密度高、易储存、燃烧过程不产生温室气体等优势,有望成为未来化石燃料替代的解决方案.本文建立了铝颗粒粉尘火焰的燃烧模型,其中考虑了相间传热、相变、表面化学反应、气相详细化学反应及辐射传热等过程,并针对铝颗粒粉尘对冲火焰开展了数值模拟研究.首先,通过仿真McGill大学的铝颗粒粉尘对冲火焰实验进行模型验证,并分析了实验中使用铝颗粒本身作为示踪粒子引起的气相速度测量误差,结果表明,数值模拟得到的离散相速度分布与实验结果基本一致,火焰传播速度的预测值也同实验数据吻合较好.当颗粒粒径小于10μm时,连续介质假设不再成立,相间传热模型必须考虑过度区机制,随着颗粒粒径的增加,火焰传播速度不断降低.随着对冲火焰拉伸率的增加,颗粒在火焰区的停留时间减少,并出现燃烧不完全的现象,粉尘火焰由双峰变为单峰结构.火焰传播速度随着拉伸率的增加而增大,通过线性外推可得到未拉伸的火焰传播速率约为29 cm/s.辐射引起的热损失会导致气相温度大幅降低,但辐射传热对颗粒的加热作用相对较小.

关键词：铝燃烧对冲火焰颗粒粉尘火焰传播速度

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WNT/β-catenin-M2 macrophage interplay as a target for therapy against hepatocellular carcinoma:Role of Calculus bovis

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World Journal of Gastroenterology 2025年第3期31卷 130-133页

作者： Tryfonas Mpektsis Anastasios Manolakis andreas Kapsoritakis Department of Gastroenterology University Hospital of LarisaLarisa 41100Greece

Liver cancer,and in particular hepatocellular carcinoma(HCC)is a disease of rising prevalence and *** date,definitive treatment options include either surgical excision or ablation of the affected *** increasing research on several pathways that could be involved in the progression of HCC,new elements within these pathways emerge as potential targets for novel *** WNT/β-catenin pathway favors the presence of M2 tumor-associated macrophages which in turn promote tumor growth and *** inhibition of this pathway is considered a good candidate for such targeted therapeutic ***,as Huang et al show in their recently published article,Calculus bovis which is used in traditional Chinese medicine can exert an inhibitory effect on theβ-catenin pathway and become a potential candidate for targeted pharmacotherapy against liver cancer.

关键词： Hepatocellular carcinoma Calculus bovis WNT/β-catenin pathway Tumorassociated macrophages

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Microglia:a promising therapeutic target in spinal cord injury

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Neural Regeneration Research 2025年第2期20卷 454-463页

作者： Xiaowei Zha Guoli Zheng Thomas Skutella Karl Kiening andreas Unterberg Alexander Younsi Department of Neurosurgery Heidelberg University HospitalHeidelbergGermany Department of Neuroanatomy Institute for Anatomy and Cell BiologyHeidelberg UniversityHeidelbergGermany

Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal *** a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal *** this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor *** a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive *** review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.

关键词： astrocytes cytokines functional recovery immune regulation M1/M2 activation macrophages microglia neuroinflammation spinal cord injury therapy

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Simulation of microswimmer hydrodynamics with multiparticle collision dynamics

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Chinese Physics B 2020年第7期29卷 55-61页

作者： andreas Zottl Institute for Theoretical Physics TU WienWiedner Hauptstraße 8-101040 WienAustria

In this review we discuss the recent progress in the simulation of soft active matter systems and in particular the hydrodynamics of microswimmers using the method of multiparticle collision dynamics,which solves the hydrodynamic flows around active objects on a coarse-grained *** first present a brief overview of the basic simulation method and the coupling between microswimmers and *** then review the current achievements in simulating flexible and rigid microswimmers using multiparticle collision dynamics,and briefly conclude and discuss possible future directions.

关键词： active matter multiparticle collision dynamics microswimmers coarse-grained hydrodynamic simulations

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Tunable structural colors on display

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Light(Science & Applications) 2022年第6期11卷 1036-1037页

作者： andreas Tittl Chair in Hybrid Nanosystems Nanoinstitute MunichFaculty of PhysicsLudwig-Maximilians-Universitat MünchenKoniginstraβe 1080539 MünchenGermany

Structural coloration takes inspiration from the bright hues found in nature to control the reflection and transmission of light from artificially structured *** them with active electrical tuning heralds breakthrough... 详细信息

关键词： materials tuning breakthrough

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Geoscience material structures prediction via CALYPSO methodology

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Chinese Physics B 2019年第10期28卷 38-49页

作者： andreas Hermann Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy The University of Edinburgh

Many properties of planets such as their interior structure and thermal evolution depend on the high-pressure properties of their constituent materials. This paper reviews how crystal structure prediction methodology can help shed light on the transformations materials undergo at the extreme conditions inside planets. The discussion focuses on three areas:(i) the propensity of iron to form compounds with volatile elements at planetary core conditions(important to understand the chemical makeup of Earth's inner core),(ii) the chemistry of mixtures of planetary ices(relevant for the mantle regions of giant icy planets), and(iii) examples of mantle minerals. In all cases the abilities and current limitations of crystal structure prediction are discussed across a range of example studies.

关键词： crystal structure prediction core materials planetary ices hydrous minerals

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Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

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Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： Carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek Xavier Monforte Johannes C.Heinzel Antal Nógrádi andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian Cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University Clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGCs). However, the use of tNGCs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGC would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGCs and compared the various features of these improved silk^(+) tNGCs with the tubes without holes(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGCs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGCs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGCs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGCs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

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Plasma optics improving plasma accelerators

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Light(Science & Applications) 2022年第9期11卷 1954-1955页

作者： andreas Dopp Ludwig-Maximilians-Universit?t Munchen GarchingGermany

Plasma accelerators driven by high-power lasers can provide high-energy electron beams on a dramatically smaller scale than conventional radio-frequency ***,the performance of these accelerators is fundamentally limited by the diffraction of the ***-generated plasma waveguides can mitigate this problem and,combined with a controlled injection method for electrons,highlight the potential of novel laser-plasma optics.

关键词： optics Plasma conventional

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Numerical micro-texture optimization for lubricated contacts-A critical discussion

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Friction 2022年第11期10卷 1772-1809页

作者： Max MARIAN andreas ALMQVIST andreas ROSENKRANZ Michel FILLON Department of Mechanical and Metallurgical Engineering Pontificia Universidad Católica de ChileSantiago 690411Chile Division of Machine Elements LuleåUniversity of TechnologyLuleåSE-97187Sweden Department of Chemical Engineering Biotechnology and MaterialsFCFMUniversity of ChileSantiago 8370456Chile Institut Pprime CNRSUniversity of PoitiersPoitiers Cedex TSA 4112386073France

Despite numerous experimental and theoretical studies reported in the literature,surface micro-texturing to control friction and wear in lubricated tribo-contacts is still in the trial-and-error *** tribological behaviour and advantageous micro-texture geometries and arrangements largely depend on the contact type and the operating *** scale implementation is hampered by the complexity of numerical *** substantiates the urgent need to numerically design and optimize micro-textures for specific *** these aspects have not been covered by other review articles yet,we aim at summarizing the existing state-of–the art regarding optimization strategies for micro-textures applied in hydrodynamically and elastohydrodynamically lubricated *** analysis demonstrates the great potential of optimization strategies to further tailor micro-textures with the overall aim to reduce friction and wear,thus contributing toward an improved energy efficiency and sustainability.

关键词： micro-texturing hydrodynamics elastohydrodynamics tribo-simulation optimization

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