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Recent advances in physical understanding and quantitative prediction of impinging-jet dynamics and atomization

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Chinese Journal of Aeronautics 2019年第1期32卷 45-57页

作者： xiaodong chen Vigor YANG School of Aerospace Engineering Beijing Institute of Technology School of Aerospace Engineering Georgia Institute of Technology

Impinging-jet injectors are widely used in liquid propulsion applications, since their simple configuration provides reliable and efficient atomization. The flowfield involves a series of complicated spatio-temporal evolutions. Much effort has been directed toward understanding the underlying physics and developing quantitative predictions of impinging-jet atomization. This paper summarizes the recent advances in this direction, including state-of-the-art theoretical, experimental, and numerical studies, along with representative results. Finally, concluding remarks address remaining challenges and highlight modeling capabilities of high-fidelity simulations.

关键词： Computational fluid dynamics Flow instability Flow visualization Gas/liquid interfacial dynamics Impinging-jet atomization Theoretical models Two-phase flow

Artificial interphase engineering of electrode materials to improve the overall performance of lithium-ion batteries

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Nano Research 2017年第12期10卷 4115-4138页

作者： Zhiqiang Zhu xiaodong chen Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University SONanyang Avenue 639798 Singapore

The overall performance of lithium-ion batteries （LIBs） is closely related to the interphase between the electrode materials and electrolytes. During LIB operation, electrolytes may decompose on the surface of electrode materials, forming a solid electrolyte interphase （SEI） layer. Ideally, the SEI layer should ensure reversible lithium-ion intercalation in the electrodes and suppress interfacial interactions. However, the chemical and mechanical stabilities of the SEI layer are not usually able to meet these requirements. Alternatively, tremendous efforts have been devoted to engineering the surface of electrode materials with an artificial interphase, which shows great promise in improving the electrochemical performance. Herein, we present a comprehensive summary of the state-of-the-art knowledge on this topic. The effects of the arrifidal interphase on the electrochemical performance of the electrode materials are discussed in detail. In particular, we highlight the importance of three functions of artificial interphases, including inhibiting electrolyte decomposition, protecting the electrodes from corrosion, and accommodatinz electrode volume chanzes.

关键词： artifidal interphase solid electrolyte interphase electrode materials lithium-ion batteries

Bioinspired Strategies for Stretchable Conductors

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Chemical Research in Chinese Universities 2023年第1期39卷 30-41页

作者： ZHANG Feilong chen xiaodong Innovative Center for Flexible Devices(iFLEX) Max Planck-NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore

Stretchable conductors are indispensable components of stretchable electronic devices,such as stretchable sensors,transistors,light-emitting diode arrays,solar cells,and so ***,most of the conductive materials are stiff with very low *** has evolved various strategies to realize stretchability,which give a lot of inspirations to the design and fabrication of stretchable *** herein summarized the nature’s strategies to realize stretchability and revealed the underlying *** that,the applications of these strategies in fabricating stretchable conductors are exemplified and the effects of some important parameters on the performances are ***,possible applications of these stretchable conductors are ***,critical issues in the stretchable conductors are discussed and several prospective exploration directions are provided.

关键词： Bioinspired strategy Stretchable Conductor

Marching towards flexible intelligent materials

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Science China Materials 2022年第8期65卷 1991-1993页

作者： Yuxin Tang xiaodong chen College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Innovative Centre for Flexible Devices(iFLEX) Max Planck-NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Institute of Materials Research and Engineering the Agency for ScienceTechnology and Research2 Fusionopolis WayInnovis#08-03138634Singapore

Our society is transforming into more intelligent eco-systems that seamlessly merge human beings,machines,the internet,and *** unprecedented momentum in such dramatic transformation inevitably relies on innovation in smarter *** intelligent materials are eagerly demanded in such *** intelligent materials are soft materials whose properties can be altered by external stimuli.

关键词： Marching evolution internet

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Alteration of estuarine circulation pattern due to channel modification in the North Passage of the Changjiang River Estuary

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Acta Oceanologica Sinica 2021年第1期40卷 162-172页

作者： Lei Zhu xiaodong chen Zhimo Wu School of Marine Science Sun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519090China

The exchange flow structure was examined in the North Passage of Changjiang River Estuary,where a deep waterway project(DWP)was carried out to improve the *** the construction of the DWP,the friction effect played a significant role in shaping the transverse structure of the exchange *** turbulent eddy viscosity generated near the seabed can be transferred to the upper water column,which facilitated vertical momentum *** a result,the landward inflow extended to–2 m below the water surface and the seaward outflow was concentrated on the shallow shoal on the southern side of the cross *** the construction of the DWP,the turbulent mixing was suppressed as a result of density *** friction felt by the water was constrained in the lower half of the water column and the vertical momentum exchange was ***,the channel became dynamically narrowed with a Kelvin number of ***,the Coriolis played a minor role in shaping the transverse structure of the exchange *** a consequence,the exchange flow featured a vertically-sheared pattern,with outflow at the surface and inflow ***,the gravitational circulation was enhanced due to increase in along-channel density gradient and *** exchange flow components associated with the lateral processes(residual currents induced by eddy viscosityshear covariance and lateral advective acceleration)were reduced,which suggests that lateral processes played a minor role in modifying the along-channel dynamics when the estuary becomes dynamically-narrowed.

关键词： exchange flow stratification lateral circulation Changjiang River Estuary

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纵轴岩巷掘进机截割部故障分析

煤矿机械 2025年第1期46卷 178-180页

作者：陈效栋朱阳阳上海创力集团股份有限公司上海201706

主要介绍了纵轴岩巷掘进机截割部的组成和工作原理。通过对截割部结构分析,结合现场经验,总结了一些常出现的故障现象,对其原因进行分析并提出应对措施,可以帮助维修人员快速判断和解决问题,也为截割部的设计提供依据。

关键词：掘进机岩巷截割部故障分析

Analysis of axially displaced elliptical antenna using hybrid method

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The Journal of China Universities of Posts and Telecommunications 2015年第6期22卷 51-56,93页

作者： Liu Xiaoming Yu Junsheng chen xiaodong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electronic Engineering and Computer Science Queen Mary University of London

Axially displaced elliptical （ADE） antenna is an evolved version of Gregorian antenna, bearing advantages of minimized blockage and relatively uniform field distribution. However, the analysis of the electrical performance of this type of antenna is a difficulty to be addressed properly. To enable the simulation of such type of reflector antenna, a hybrid method is derived for predicting the farfield of ADE antennas. Closed formulae are firstly derived for the calculation of the near field of ADE antennas based on vector analysis and the law of energy conservation. These formulae avoid time-consuming surface current integration and the current singularity on the vertex of the sub-reflector. In addition, the nature of vector analysis makes the hybrid method be capable of predicting vector electric field precisely. Furthermore, since these formulae are in explicit manner, no ray tracing process is required. The farfield is then predicted using Huygens equivalent method, assuring the accuracy in the farfield. Compared to published experimental results in the literature, the proposed method agrees well with the measurement in the main beam region. In comparison to physical optic method, the computational efficiency is much improved.

关键词： ADE antenna hybrid method Huygens equivalent method

Lateral migration of dual droplet trains in a double spiral microchannel

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Science China(Physics,Mechanics & Astronomy) 2016年第7期59卷 52-61页

作者： ChunDong Xue xiaodong chen Chao Liu GuoQing Hu State Key Laboratory of Nonlinear Mechanics Beijing Key Laboratory of Engineered Construction and MechanobiologyInstitute of MechanicsChinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Microfluidic droplets have emerged as novel platforms for chemical and biological applications. Manipulation of droplets has thus attracted increasing attention. Different from solid particles, deformable droplets cannot be efficiently controlled by inertia-driven approaches. Here, we report a study on the lateral migration of dual droplet trains in a double spiral microchannel at low Reynolds numbers. The dominant driving mechanism is elucidated as wall effect originated from the droplet deformation. Three types of migration modes are observed with varying Reynolds numbers and the size-dependent mode is intensively investigated. We obtain empirical formulas by relating the migration to Reynolds numbers and droplet sizes. The effect of droplet deformability on the migration and the detailed migration behavior along the double spiral channel are discussed. Numerical simulations are also performed and yielded in qualitative agreement with the experiments. could be a promising alternative to existing inertia-driven approaches bio-particles. This proposed low Re approach based on lateral migration especially concerning deformable entities and susceptible

关键词： microfluidics droplet migration double spiral microchannel

Flow-pattern-altered syntheses of core–shell and hole–shell microparticles in an axisymmetric microfluidic device

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Acta Mechanica Sinica 2021年第9期37卷 1378-1386,I0001页

作者： Duo Wang Xu Zheng xiaodong chen Guoqing Hu State Key Laboratory of Fluid Power and Mechatronic Systems Department of Engineering MechanicsZhejiang UniversityHangzhou310027China State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China

Droplet-based microfluidics offers unique advantages to create platforms that fabricate functionalized particles with increased accessibility,robustness,and *** we present a three-phase microfluidic device that can control the flow pattern to directly generate either core–shell or hole–shell *** major benefits of this device are the ease of controlling the morphology of the compound droplets by the flow rates and thus the microstructure of the synthesized *** transition between flow patterns enables the generation of either core–shell particles or Janus particles in a single *** further show the versatility of the proposed device in fabrication of functionalized particles:the hole size of the hole–shell microparticle can be fine-tuned while its outer diameter is kept constant,and by adding Fe_(3)O_(4) nanoparticles into the photocurable phase,the obtained magnetoresponsive microparticle can move rotationally or translationally under an external magnetic *** anticipate that the present method could facilitate the fabrication of the functional microparticles for diverse applications.

关键词： Microfluidics Droplet Microparticle Janus particle