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Experimental Study on the Molten Salt at Micron Scale during the Melting Process

Journal of Thermal Science 2024年第1期33卷 70-85页

作者： TIAN Ziqian LIAO Zhirong XU Chao FANG Yongzhe jiang kaijun YUAN Mengdi Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education of ChinaSchool of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

The investigation of the melting behaviors of the molten salt at micron scale during the melting process is critical for explaining the solid-liquid phase transition *** this paper,a novel experimental system and analysis method were proposed to study the melting process with three heating rates in the range of1-10℃/min of the solar salt at micron *** solid-liquid boundary morphology and phase transition kinetics of molten salt particles were focused ***,the correlations between liquid fraction,temperature and time under different heating rates were *** solid-liquid boundary morphology was depicted by the visualized experimental set-up,and the instantaneous liquid volume fraction during the non-isothermal phase transition was ***,the correlation between temperature and liquid volume fraction was proposed to reveal the evolution of the solid-liquid boundary with temperature at different heating ***,the non-isothermal phase transition kinetic equation was established by introducing a constant parameter(V_(a,b)),and more kinetic parameters such as 1g V_(a,b) and-lg V_(a,b)/b were *** results showed that the exponent b is not sensitive to the heating rate with a range of 3-5 for solar salt ***,the heating rate influences the value of V_(a,b) and presents a positive ***,the non-isothermal phase transition kinetic equations at different heating rates in the range of 1-10℃/min can be quickly predicted by the proposed improved experimental test *** study could fill the research insufficiency and provide significant guidance for future research on the solid-liquid transition mechanism of molten salts at micron scale.

关键词： molten salt non-isothermal phase transition solid-liquid boundary morphology liquid volume fraction micron scale melting process

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Characteristics of Axial and Radial Development of Solids Holdup in a Countercurrent Fluidized Bed Particle Solar Receiver

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Journal of Thermal Science 2021年第6期30卷 2223-2240页

作者： jiang kaijun WANG Fengli KONG Yanqiang XU Chao DU Xiaoze MOE Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power UniversityBeijing 102206China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China

A novel particle solar receiver(PSR)with gas-solids countercurrent fluidized bed(CCFB)was *** cold-mold prototype was set up to investigate the gas-solids flow structure by using optical fiber *** local solids holdup distribution,its evolution with various operating conditions and the fluctuations of the local flow structures were investigated *** results show that the novel CCFB can achieve much higher solids holdup(~9%)compared to the traditional downer ones(~l%).The solid particles are mainly distributed in the near-wall region and the particles are more difficult to get a fully developed state in the near-wall *** excellent gas-solids mixing and contacting demonstrated by the standard deviation and intermittency index means a better wall-to-bed heat transfer *** distribution of the solid particles in the CCFB transport tube is revealed,which can provide a significant reference for the structure design of the hot-mold ***,the research can fill in the research gap in the gas-solids counterflow field.

关键词： concentrated solar power particle solar receiver countercurrent fluidized bed optical fiber probe local solids holdup

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Experimental Investigation on the Hydrodynamic Characteristics of Fluidized Bed Particle Solar Receiver with Gas-Solid Countercurrent Flow Pattern

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Journal of Thermal Science 2021年第6期30卷 2241-2253页

To design a particle solar receiver(PSR),a vital energy conversion system,is still a bottleneck for *** study presents a novel PSR based on countercurrent fluidized bed(CCFB)technology,named CCFB *** this design,downward-moving particles are subjected to the action of an up-flow gas to reduce the falling speed and enhance the radial disturbance,and hence increase the residence time of particles and improve the heat transfer.A cold-mold visual experimental setup is *** influence factors are investigated experimentally,including the superficial gas velocity,solid flux,aeration gas,particle size and transport tube *** results indicate that the maximum solid holdup can exceed 9%or so with fine particles of diameter d_(p)=113.5 μm and a tube diameter of 40 *** is proved that the CCFB can operate stably and adjust the solid flux *** results of this study provide a new structure for PSRs in the concentrated solar power field and could fill the research insufficiency in the gas-solid counterflow field.

关键词： particle solar receiver gas-solid two-phase flow countercurrent fluidized bed solid holdup

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Water Resource Development in the Quaternary Ryukyu Limestone Regions of Japan:Application of the GIS to the Site Selection of Underground Dams

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Acta Geologica Sinica(English Edition) 2001年第3期75卷 254-259页

作者： kaijun jiang Hiroyasu FURUKAWA Yuji ONOYAMA Testuro ESAKI Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Institute of Environmental Systems Kyushu University Fukuoka Japan 812-8581

Based on the natural and social conditions as well as hydrogeological characteristics of the Ryukyu limestone, a major aquifer in the Ryukyu Islands, a conception of underground dam, was proposed in the early 1970s in order to develop ground water resources in the Quaternary Ryukyu limestone regions of Japan. The practice of nearly thirty years has shown that the underground dam is an environment-friendly and effective way for developing ground water in these regions.

关键词： underground dam limestone Quaternary GIS ground water

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Radio-frequency spectroscopic measurement for pairing gap in an ultracold Fermi gas

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Science China(Physics,Mechanics & Astronomy) 2013年第3期56卷 581-587页

作者： jiang kaijun LUO Hua LI Kai ZHANG DongFang GAO TianYou PENG ShiGuo State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences

The study of ultracold Fermi gases has exploded a variety of experimental and theoretical research since the achievement of degenerate quantum gases in the lab,which expands the research range over atomic physics,condensed matter physics,astrophysics and particle *** the Feshbach resonance,one can tune the attractive two-body interaction from weak to strong and thereby make a smooth crossover from the BCS superfluid of cooper pairs to the Bose Einstein condensate of bound *** this crossover regime,the pairing effect plays a significant role in interpreting the interaction *** the localized or delocalized pairing occurs at sufficiently low temperature,the single-particle energy will shift with respect to free atoms,due to the two-body or many-body *** the pairing gap can improve the understanding of the thermodynamics and hydrodynamics of the phase transition from the pseudogap to the superfluid,which will make an analogue to the high-temperature superconductivity in condensed *** this work,we will give a brief introduction to a novel radio-frequency(RF) spectroscopic measurement for pairing gap in an ultracold Fermi gas,which is currently widely used on the ultracold atomic table in the *** different interaction regimes of the BEC-BCS crossover,ultracold atoms are excited with a RF pulse and the characteristic behavior can be extracted from the spectrum.

关键词： degenerate Fermi gas Feshbach resonance Bose Einstein condensate superfluid

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Chemical profiling of principle active and toxic constituents in herbs containing aristolochic acids

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Chinese Herbal Medicines 2024年第2期16卷 293-300页

作者： Lijun Yue kaijun Yang Feng jiang Shuai Dong Kang Yang Dan Zhu School of Pharmacy Minzu University of ChinaBeijing 100081China Key Laboratory of Ethnomedicine Ministry of Education Minzu University of ChinaBeijing 100081China Hospital of Minzu University of China Beijing 100081China

Objective:To clear the amounts of the principal active/toxic components in herbs containing aristolochic acids(HCAAs),which are still used as medicine and/or seasoning in many ethnic minority areas of ***:In this study,six major active and toxic components in HCAAs were extracted with ultrasonic *** 6-O-methyl guanosine as internal standard,the target compounds were analyzed qualitatively and quantitatively by using ultrahigh performance liquid chromatography-electrospray ionization-tandem mass spectrometry(UPLC-ESI-MS/MS)with multiple reaction monitoringinformation dependent acquisition-enhanced production ion scanning mode(MRM-IDA-EPI)combined with dynamic background subtraction(DBS)***:The method showed good linearity in the linear range of the six *** limit range of detection was from 0.01 ng/mL to 0.27 ng/*** of the detection repeatability,extraction repeatability and accuracy of the method were *** extraction,the samples remained stable at 15℃ within 24 *** analytes were all found in samples except aristolactam(AL)in sample 2,and the contents varied *** contents of these compounds decreased in fruits,leaves and stems of Aristolochia delavayi ***:This method has the advantages of less sample dosage,simple operation,short analysis cycle,high sensitivity,specificity and *** laid a good foundation for guiding the safety of HCAAs,the indepth study of pharmacological and toxicological effects and the scientific and standardized processing and compatibility of HCAAs.

关键词： aristolactam aristolochic acids chemical profiling herbs containing aristolochic acids ultrahigh performance liquid chromatography-electrospray ionizationtandem mass spectrometry(UPLC-ESI-MS/MS)

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Radio-frequency spectroscopic measurement for pairing gap in an ultracold Fermi gas

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Science China Chemistry 2013年第3期56卷 581-587页

关键词： degenerate Fermi gas Feshbach resonance Bose Einstein condensate superfluid

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开井期间抽汲求产对压恢曲线试井分析的影响

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油气井测试 2005年第5期14卷 25-28页

作者：张雁蒋凯军大庆油田有限责任公司试油试采分公司黑龙江大庆163412

抽汲求产是一个很复杂的间歇生产过程,对应的压力恢复曲线试井解释方法有别于自喷井定产量模型,尤其当抽汲周期产量波动较大时,解释结果往往将产生较大误差。经研究分析发现,如果开井期间根据抽汲周期实测产量变化情况划分多个流动段,... 详细信息

抽汲求产是一个很复杂的间歇生产过程,对应的压力恢复曲线试井解释方法有别于自喷井定产量模型,尤其当抽汲周期产量波动较大时,解释结果往往将产生较大误差。经研究分析发现,如果开井期间根据抽汲周期实测产量变化情况划分多个流动段,即采用自喷井变产量迭加方法对压力恢复曲线进行拟合分析,则可以近似模拟抽汲求产情况,降低解释误差。经两口井资料处理,均获得较好效果,解决了以往采用自喷井单流量模型解释明显不合理的问题,达到了准确评价储层的目的。

关键词：测试抽汲压力恢复曲线试井分析误差压力恢复曲线抽汲试井分析开井间歇生产过程产量模型试井解释方法自喷井拟合分析

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Numerical analysis of the effects of subgrade settlement on top-down cracking in epoxy asphalt pavement

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Science China Technological Sciences 2024年第10期67卷 3308-3320页

作者： jiang XiuJie HUANG Wei LUO Sang WEI Ya KONG WeiYi DU kaijun School of Transportation Southeast University Intelligent Transportation System Research Center Southeast University Department of Civil Engineering Tsinghua University Nanjing Modern Multimodal Transportation Laboratory

Epoxy asphalt pavement cracking caused by subgrade settlement is detrimental to the long-term safe service of roads. A threedimensional finite element model of epoxy asphalt pavement is established to investigate the effects of subgrade settlement on the propagation of top-down cracking(TDC). The contour integral method is utilized to calculate the stress intensity factor(SIF)at the crack tip, and then the extended finite element method(XFEM) is used to analyze the propagation behavior of TDC under combined subgrade settlement and traffic loading. The results of these analyses indicate that increased subgrade settlement,stiffer surface layers, and softer bases will increase the SIF, resulting in a faster crack propagation rate. It is suggested that the use of epoxy asphalt materials in pavement structures can allow more subgrade settlement than conventional asphalt ***, when the base layer modulus is higher than 12500 MPa, the increase in surface modulus can decrease crack propagation length. Sensitivity analysis results demonstrate that subgrade settlement has the most significant impact on TDC propagation. The conclusions of this study are expected to provide a theoretical basis for crack prevention in the design and maintenance of pavement structures.

关键词： epoxy asphalt pavement subgrade settlement XFEM stress intensity factor crack propagation

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深层气井井底流压折算方法及其应用

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油气井测试 2007年第6期16卷 31-34页

作者：张雁蒋凯军大庆油田有限责任公司试油试采分公司黑龙江大庆163412

针对大庆油田深层气井试井压力计记录的压力存在深度误差这一问题,采用积分叠代方法进行了井底流压折算。为验证理论计算结果的准确性,利用深层气井试井过程中记录的井口油压数据,折算出压力计深度处的压力,与压力计实测流压进行对比分... 详细信息

针对大庆油田深层气井试井压力计记录的压力存在深度误差这一问题,采用积分叠代方法进行了井底流压折算。为验证理论计算结果的准确性,利用深层气井试井过程中记录的井口油压数据,折算出压力计深度处的压力,与压力计实测流压进行对比分析,确定了该方法的适用范围,并对理论计算和实测压力对比符合较好的深层气井进行了气层中部流压折算,符合较好,为深层气井储层评价和勘探开发提供了依据。

关键词：流压折算深层气井油压压力对比

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