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Measurement of falling film thickness around a horizontal tube using laser-induced fluorescence technique

Journal of Physics: Conference Series 2009年第1期147卷

作者： Xiaofei Wang Maogang He Hualiang Fan Ying Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 People's Republic of China

An optical method for the non-intrusive measurement of falling film thickness on the perimeter of the horizontal tube is described. This non-intrusive measurement method is based on the visualization of the falling film flowing around the horizontal tube and uses the laser induced fluorescence and image processing techniques. The falling film thickness around a Turbo-CII horizontal tube and a plain horizontal tube was measured when water flushed the tube vertically with a stable velocity. The results for the Turbo-CII tube are compared with those for the plain tube, and show that the film thickness around the Turbo-CII tube varies with the same trend as that around the plain tube, and the minimal values of the film thickness tend to locate at different angular position of 95°-120° under different conditions. The film thickness around the enhanced tube changes within a smaller range with time than that around the plain tube. The corresponding effects on flow uniformity have also been discussed.

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Numerical study on the influence of plugging rate on the performance of adjustable steam ejector

International Journal of Fluid Engineering

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International Journal of Fluid engineering 2024年第2期1卷 50-60页

作者： Jianxiang Gao Zepeng Yuan Yuyan Hou Weixiong Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

During the operation of thermal power plant systems, severe challenges to the quality and safety of the heat supply arise owing to the effects of peak regulation. Steam ejectors, widely employed in the district heating sector, often exhibit poorer performance under off-design conditions as a result of their fixed structure. This study analyzes the effects of varying plugging rate, primary pressure, and induced pressure on the performance of adjustable steam ejectors. As the plugging rate increases, the mass flow rate of the primary fluid decrease, potentially falling below 32%, and that of the induced fluid initially experiences a minor increase, followed by a rapid decrease. Concurrently, the critical back pressure also decreases with an increase in the plugging rate, potentially falling by up to 65%. By contrast, the entrainment ratio surges with increasing plugging rate, with the maximum increase reaching up to 4.75 times. Under the same primary steam pressure and induced steam pressure, there exists an optimal entrainment ratio. Furthermore, both the critical back pressure and the optimal entrainment ratio increase as the primary steam pressure and induced steam pressure increase.

关键词： performance steam optimal

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Strengthening Chlorobenzene Catalytic Degradation Rate and Selectivity Over Laxsr1-Xmno3±Δ by Anchoring Interfacial Oxygen Vacancy

SSRN

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SSRN 2022年

作者： Li, Lu Tao, Dan Zhao, Qi Fu, Shuangshuang Min, Xin Chen, Changwei Tian, Mingjiao Shi, Jianwen He, Chi State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy School of Electrical Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China College of Geology and Environment Xi’an University of Science and Technology Shaanxi Xi’an710054 China Faculty of Electronic and Information Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology Shaanxi Xi’an710055 China School of Environmental Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai200240 China

Surficial lattice oxygen in perovskite compounds is a common participant during chloroaromatic catalytic destruction. Herein, we proposed a facile oxygen vacancy construction strategy for preparing high active LaxSr1-xMnO3±δ (LSMO) via NaBH4 treatment. Results reveal that LSMO composites are not only reduced by NaBH4 under mild condition, but trigger a significant Sr segregation effect, which plays a key role in oxygen vacancy formation accounting to the electron donation from Sr to Mn acceptor and subsequent lattice oxygen activation. Moreover, the concentration of interfacial active oxygen species can be regulated by taming the La-Sr interaction with different Sr substitution proportions. The anchored oxygen vacancies (OVs) take advantage of electron capture or transfer and induce molecule oxygen into active oxygen species to react with chlorobenzene molecules, resulting in a preferential catalytic oxidation capacity. Amongst, reduced La0.5Sr0.5MnO3±δ catalyst displays superior chlorobenzene destruction efficiency with 90% of which converted as low as 236 °C, which also exhibited a stable performance in long-time operation. However, the OVs would be refilled by water H2O molecules resulting in a weaker water resistance for OVs anchored catalyst. In summary, the annihilation of OVs is the most important factor for catalyst deactivation. The research offers a new avenue to construct interfacial oxygen species in perovskite oxides during the chlorobenzene deep oxidation process. © 2022, The Authors. All rights reserved.

关键词： Catalytic oxidation

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Corrigendum to “Multi-scale coupling analysis of the flow blockage accident in the typical LFR” [Int. J. Therm. Sci., 195, January 2024, 108615]

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International Journal of Thermal Sciences 2024年 204卷

作者： Hanrui Qiu Mingjun Wang Jing Zhang Wenxi Tian G.H. Su State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China

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Research on droplets growth of Marangoni condensation during the time-series process

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Journal of Physics: Conference Series 2017年第1期925卷

作者： Y Li J Wang K Xia N Chen J Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'lan 710049 P.R. China

In this paper, the condensate droplets growth of Marangoni condensation during the time-series process was experimentally studied. The photographs taken in the experiments were handled by image processing method. The droplets coverage ratio was introduced to analyse the growth process. As the time-series process went on, the condensate droplets coverage ratio increased fast at first, and then increased slowly until reaching a stable state. The droplets coverage ratio increased with the increase in the vapor-to-surface temperature difference and decreased with the increase in the ethanol vapor concentration.

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Fluoride-Salt-Cooled High-Temperature Reactor: An Integrated Nuclear-Based Energy Production and Conversion System

SSRN

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SSRN 2023年

作者： Zhang, Dalin Li, Xinyu Jiang, Dianqiang Zhou, Xingguang Lv, Xindi Yun, Shichang Wu, Wenqiang He, Xuanang Li, Haoyang Min, Xin Chen, Kailong Tian, Wenxi Qiu, Suizheng Su, G.H. Zhao, Quanbin Fu, Yao Tang, Chuntao Zhuo, Wenbin Li, Jinggang Zuo, Jiaxu State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Shanghai Nuclear Engineering Research & Design Institute CO. LTD. Shanghai200233 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu610213 China China Nuclear Power Technology Research Institute Guangdong Shenzhen518000 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment People's Republic of China Beijing100082 China

Based on the analysis of energy structure and the development trends of advanced nuclear energy technology, combining the complementary advantages of nuclear energy and other energy sources in China, the Fluoride-salt-cooled High-temperature Reactor(FuSTAR) system has been proposed. FuSTAR system is designed to address production capacity issues in areas with energy shortages or resource concentration and can be combined with high-temperature process heat to achieve high-value-added processes such as hydrogen production. In this paper, the Tri-structural isotropic fuel combined with helical cruciform elements has been studied in detail on the neutron physics and thermal-hydraulic properties, and the flow and heat transfer experiment is carried out for the first time. The multilayer nonlinear programming method has been applied to the design of thermal transport systems. Then the optimal parameters and configuration of the thermoelectric conversion system are obtained by the superstructure optimization method. The inherent safety of FuSTAR is demonstrated through deterministic safety analysis. In addition, the iodine-sulfur cycle technology and the characteristics of tritium production are also analyzed. This study highlights the significant potential of integrating nuclear energy with other energy sources in an optimized energy-production system. © 2023, The Authors. All rights reserved.

关键词： Nonlinear programming

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Radiant performance of opacifiers in opcifier-loaded silica aerogel-based composites

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Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and engineering 2012年第SUPPL.期20卷 181-189页

作者： Sun, Duo Wang, Xiaodong Duan, Yuanyuan Zhao, Junjie State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Department of Thermal Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy North China Electric Power University Beijing 102206 China Key Laboratory for Thermal Science and Power Engineering of MOE Department of Thermal Engineering Tsinghua University Beijing 100084 China

Since the opacifier-loaded silica aerogel composites have strong ability to inhibit radiant heat transfer compared to the pure silica aerogel, they can improve effectively the insulation performance at high temperature conditions and have been used extensively as thermal insulation materials in a variety of industrial applications. This paper developed a theoretical model to predict the radiant performance of opacifiers by using the Mie scattering theory, Beer law and a radiant heat transfer equations. The model was used to calculate the radiant performance of carbon black opacifier with various particle diameters and the radiant performance of three opacifiers, carbon black, SiC and ZrO2. The results showed that the opacifier-loaded silica aerogel composites had much higher extinction coefficient than the pure silica aerogel in a range of 3-7.5 μm wave band or in medium and high temperature ranges, which significantly improved the insulation performance of composites. With a fixed opacifier mass fraction, the optimal particle diameter was 2-3 μm for carbon black opacifier. Among the three opacifiers, carbon black opacifier had better opaque property than that of SiC and ZrO2 opacifiers. Due to poor thermostability for carbon black opacifier at high temperature conditions, the optimal material design for opacifier-loaded silica aerogel composites should be as follows: SiC or ZrO2 are added on high temperature side of aerogel and carbon black is added on low temperature side.

关键词： Thermal conductivity

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Mechanotransduction in Tooth Pain Sensation

Mechanotransduction in Tooth Pain Sensation

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The 5th Shanghai International Conference on Biophysics and Molecular biology 第五届上海国际力生物学学术会议(SICBM2011)

作者： Min Lin ZhengYuan Luo BoFeng Bai Feng Xu TianJian Lu Biomedical Engineering and Biomechanics Center School of AerospaceXi''an Jiaotong UniversityXi''an 710049PR.China State Key Laboratory of Multiphase Flow in Power EngineeringXi''an Jiaotong UniversityXi''an 710049PR China Biomedical Engineering and Biomechanics CenterSchool of AerospaceXi''an Jiaotong UniversityXi''an 710049PR.China HST-Center for Biomedical Engineering Department of MedicineBrigham and Women''s HospitalHarvard Medical SchoolBostonMAUSA

Cold stimuli evoke more rapid transient pain sensations in human teeth than hot ***, the underlying mechanism remains *** has been reported that hot stimuli cause an inward flow (toward the tooth pulp chamber) of the dentinal fluid in dentinal microtubules while cold stimuli cause flow in a reverse *** study attempts to quantify tooth pain sensation by coupling a computational fluid dynamics (CFD) model, which describes the fluid mechanics in dentinal microtubules, with a modified Hodgkin-Huxley (H-H) model, which describes the neural discharge behavior.

关键词： tooth pain sensation dentinal fluid flow fluid dynamics model Hodgkin-Huxley (H-H) model mechanoreceptor neural discharging

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Economic performance analysis and heat exchange calculating in the system of storage ice by spraying water in winter

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Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and engineering 2005年第SUPPL.期13卷 177-183页

作者： Liu, Weimin Bi, Qincheng Guo, Yajun Dong, Mingxiao Zhang, Linhua Gao, Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China School of Environmental and Municipal Eng. Xi'an University of Architecture and Technology Xi'an 710049 China Shandong Institute of Architecture and Engineering Jinan 250014 China

The system of ice-making by spraying water in winter and utilizing the ice in summer is pollution-free and economizes the first investment, operating cost, and reduces the peak of electric power in summer. Through establishing the energy equilibrium equation of sprayed water drop, the relation between the diameter of water droplet and the time of icing at different ambient temperature and coefficient of performance of the system of ice-making by spraying water has been obtained. The errors between the numerical solution and the experimental data lie in a range of 7% to 10%, indicating that the model is reasonable. The method of the ice making is promising in the exercisable region to substitute the mechanical refrigeration system.

关键词： Cold storage

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Hydrodynamic analysis and calculation of metal temperature distribution in spiral water wall of ultra supercritical tower boiler

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AIP Conference Proceedings 2013年第1期1547卷

作者： Chengwu Shen Dong Yang Danhua Yao Yufeng Zhu Xueyuan Xu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China Shanghai Boiler Works Ltd. Shanghai China

In this paper, the spiral water wall system of a 1000MW ultra supercritical tower boiler is simplified as a network system, consisting of circuits, pressure grids and connecting tubes. The establishment of the mathematical model for calculating the mass flux distribution and metal temperature in water wall is based on the mass, momentum and energy conservation equations. The water wall flow distribution and temperature profile of the boiler were computed. The result shows that the differences of outlet temperature and mass flux are small in spiral tube water wall at BMCR, 75%BMCR load and 40%BMCR load. The metal temperatures are all in the allowable ranger.

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