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Multi-source driven capillary plane radiation air conditioning system

AIP Conference Proceedings 2017年第1期1864卷

作者： Juanjuan Hu Mofeng Qu Huasheng Wang Shiyao Ni State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

A new absorption refrigeration system, which is driven by solar energy, biomass energy and geothermal energy simultaneously, was designed with capillaries as its radiation surface. Likewise, variations of water temperature in the capillaries with the change in both time and its flow rate were experimentally researched as well as how COP of the system varies with the surrounding temperature. The following conclusions have been obtained: Common refrigeration demand can be met by the system after its operation in 1 hour; with the increase in water flow rate in the capillaries, its temperature, which drops down after an increase, gets its peak value at the flow rate of 4.5-5.5 L/min; COP of the system decreases with the rise of surrounding temperature, thus it’s better to keep it from direct sunlight. With the utilization of natural energy and the structure of capillaries, the system’s advantages in simple structure, low cost, environment-friendly working process and nice performance lead to promising application prospects, especially in residence refrigeration in countryside.

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An experimental study of two-phase pressure drop of liquid nitrogen in circular horizontal channels 1

An experimental study of two-phase pressure drop of liquid n...

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1st International Conference IIR of Cryogenics and Refrigeration Technology, ICCRT 2016

作者： Chen, Xingya Zhang, Qiaoyu Xue, Rong Lai, Tianwei Hou, Yu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an China School of Energy and Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an China

ISBN: (纸本)9782362150173

Two-phase cryogenic flow are involved in many cooling systems. In order to study the mechanism of cryogenic two phase flow. Two-phase pressure drop of liquid nitrogen (LN2) in a circular horizontal channels was experimentally studied. A wide range of flow conditions: inlet pressure from 0.15 MPa to 0.30 MPa and mass flux from 120 kg/m2s to 320 kg/m2s, and tube diameters of 4 mm were performed in the experiment. The frictional pressure drop of two-phase LN2 in circular horizontal channel is estimated using two models, the homogeneous model and the separated flow model. In addition, the measured pressure drops are compared with those calculated from correlation models available for mini-scales. As a result, the homogeneous model with the Cicchitti et al. predict better than the other correlations mentioned in this study. © 2016, International Institute of Refrigeration. All rights reserved.

关键词： Two phase flow

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Three-dimensional positioning method for moving particles based on defocused imaging using single-lens dual-camera system

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Chinese Optics Letters 2016年第3期14卷 42-46页

作者：周骛金娜贾敏华杨荟楠蔡小舒 Institute of Particle and Two-Phase Flow Measurement/Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University

A method to three-dimensional position moving particles with one lens and two cameras is proposed. Two par- ticle images with different degrees of defocusing are adopted to solve the ambiguous problem of particle positions. A single-lens dual-camera system is developed to simultaneously capture these two images for the moving par- ticles. The measurement principles and theoretical analysis are introduced first, and then simulated investiga- tions and experimental research are discussed. The measurement errors in the simulations and experiments are less than 1% and 4%, respectively, in 20 times the depth of field of the system, which validates the feasibility of this method.

关键词： Optics Physics

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Simulation on the flue gas pre-dried lignite-fired power plants firing high moisture lignite 29

Simulation on the flue gas pre-dried lignite-fired power pla...

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29th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems, ECOS 2016

作者： Han, Xiaoqu Karellas, Sotirios Mu, Qiwei Liu, Ming Liu, Jiping Yan, Junjie Rakopoulos, Dimitrios Kakaras, Emmanuel State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens 9 Heroon Polytechniou Street Zografou15780 Greece

ISBN: (纸本)9789616980159

The integration of flue gas fan mill dryer with an open pulverizing system significantly improves the plant thermal efficiency of the Flue Gas Pre-dried Lignite-fired power Systems (FPLPS). The aim of this article is to simulate the flue gas drying process applied for high moisture lignite and to find an optimal operation mode for various lignite compositions. A previously validated GSE simulation model of the FPLPS is used in the present work. Two types of lignite from China and Greece have been investigated as the feeding coal. The plant thermal efficiency of a 600 MW supercritical unit increases by 1.46 % at design case when the moisture content of lignite is being reduced from 39.50 % to 12 %. The improvement value reduces from 1.46 % to 1.19 % in water-cooled units and 1.39 % to 1.13 % in air-cooled units when the moisture content of Chinese raw lignite decreases from 39.50 % to 29.95 %. When Greek lignite is supplied, with moisture content varying from 53.20 % to 60 %, and lower heating value from 5.44 MJ·kg-1 to 6.31 MJ·kg-1, the plant thermal efficiency drops by a maximum value of 0.53 %, without considering the limited drying capacity of the pulverizing system. Moreover, two operational modes are compared in order to address the issues of fuel type variation, including the adjustment of the drying degree to maintain the boiler load, as well as the reduction of the boiler steam output. Case studies are presented to highlight the importance of the match between lignite pre-drying system and the boiler thermal system. Both the energy-saving potential and the flexibility to fuel type variations are concluded as the benefits of lignite flue gas pre-drying. © 2016 University of Ljubljana.

关键词： Flue gases

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Study on the Enhancement Effect of Dielectric Barrier Discharge on the Premixed Methane/Oxygen/Helium Flame Velocity

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Plasma Science and Technology 2015年第12期17卷 1019-1026页

作者：穆海宝喻琳李平汤成龙王金华张冠军 State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong University State key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Recently,plasma-assisted combustion has become a potentially applicable technology in many combustion *** this paper,a dielectric barrier discharge（DBD） plasma generator is designed to explore the effect of plasma on the CH4 oxidation process,and several properties of combustion are ***,in the presence or absence of plasma discharge,physical appearance of the flame is examined and ***,the flame propagation velocity is calculated by the flame front extracted from the imaging data with the Bunsen burner ***,the main molecular components and their intensity variation in the flame and the plasma zones are identified with an emission spectrograph to analyze the effect of active species on the combustion *** also discuss the possible kinetic regime of plasma-assisted *** results imply that plasma discharge applied to the premixed CH_4/O_2/He mixture significantly raises the flame speed with equivalence ratios ranging from 0.85 to 1.10,with the flame speed improved by 17%to 35%.It can be seen that plasma can improve methane oxidation efficiency in the premixed fuel/oxidizer,especially at a low equivalence ratio.

关键词： combustion flame Oxygen equivalence appearance Velocity scenarios burning camera hydrocarbon

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Corrigendum to ‘Numerical simulation on sonic steam jet condensation in subcooled water through a double-hole nozzle’ [Int. J. Heat Mass Transfer 115 (2017) 143–147]

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International Journal of Heat and Mass Transfer 2017年 115卷 1360-1360页

作者： Lutao Wang Daotong Chong Lun Zhou Weixiong Chen Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China

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A ‐Oriented Hittorf's Phosphorus Nanorods/Polymeric Carbon Nitride Heterostructure for Boosting Wide‐Spectrum‐Responsive Photocatalytic Hydrogen Evolution from Pure Water

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Angewandte Chemie 2019年第2期132卷

作者： Yukun Zhu Chunxiao Lv Zhuocheng Yin Jun Ren Xianfeng Yang Chung‐Li Dong Hongwei Liu Rongsheng Cai Yu‐Cheng Huang Wolfgang Theis Shaohua Shen Dongjiang Yang State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles Institute of Marine Biobased Materials School of Environmental Science and Engineering Qingdao University Qingdao 266071 P. R. China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China School of Chemical and Environmental Engineering North University of China Taiyuan 030051 P. R. China Analytical and Testing Centre South China University of Technology Guangzhou 510640 P. R. China Research Center for X-ray Science & Department of Physics Tamkang University Tamsui 25137 Taiwan The Australian Centre for Microscopy & Microanalysis The University of Sydney Sydney New South Wales 2006 Australia Nanoscale Physics Research Laboratory School of Physics and Astronomy University of Birmingham Birmingham B15 2TT UK

Red phosphorus is a promising photocatalyst with wide visible‐light absorption up to 700 nm, but the fast charge recombination limits its photocatalytic hydrogen evolution reaction (HER) activity. Now, [001]‐oriented Hittorf's phosphorus (HP) nanorods were successfully grown on polymeric carbon nitride (PCN) by a chemical vapor deposition strategy. Compared with the bare PCN and HP, the optimized PCN@HP hybrid exhibited a significantly enhanced photocatalytic activity, with HER rates reaching 33.2 and 17.5 μmol h −1 from pure water under simulated solar light and visible light irradiation, respectively. It was theoretically and experimentally indicated that the strong electronic coupling between PCN and [001]‐oriented HP nanorods gave rise to the enhanced visible light absorption and the greatly accelerated photoinduced electron–hole separation and transfer, which benefited the photocatalytic HER performance.

关键词： Heterostrukturen Nanostäbe Hittorfscher Phosphor Kohlenstoffnitrid Wasserspaltung

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Influence of wettability on motion of compound droplets on solid surface in microchannel flow

Influence of wettability on motion of compound droplets on s...

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2016年大连国际微纳流体和微流控芯片大会(2016 International Conference of Microfluidics, Nanofluidics and Lab-On-A-Chip

作者： Xinglong Shang Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi ''an Jiaotong Universit Xi''an 710049China

To understand droplet motion on solid surfaces is very important for many applications such as enhanced oil recovery (Freitas et al.2011), droplet spreading, manipulation and fabrication of droplets in microfluidic devices (Worner et al.2012).Solid surface wettability affects significantly the movement of the contact line and hence dominants the motion of droplets on solid surfaces, especially when the flow is confined to microscale.

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Experimental research on absorption characteristics of CO2, SO2 and NOx in compound solution of MDEA and DMSO

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第1期37卷 116-119页

作者： Li, Lian Hu, Bin Li, Na Zhou, Qu-Lan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China North China Power Engineering CO. LTD of China Power Engineering Consulting Group Beijing100120 China

Compound solution of N-methyl-diethanolamine and dimethyl sulfoxide were selected to remove CO2, SO2 and NOx simultaneously in an experimental systems of micro bubbling bed. With suitable absorbent formula, the influence of gas flow rate, reaction temperature and solution pH value were discussed on the removal rate of CO2, SO2 and NOx 200 mL compound solution acted the best with a temperature of 40℃ and a gas flow rate of 1 L/min. The solution pH value dropped in the reaction and higher initial value of pH brought stronger absorption ability. © 2016, Science Press. All right reserved.

关键词： flow of gases

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Origin of Granular Capillarity Revealed by Particle-Based Simulations

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Physical Review Letters 2017年第21期118卷 218001-218001页

作者： Fengxian Fan Eric J. R. Parteli Thorsten Pöschel Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Jun Gong Road 516 200093 Shanghai China Institute for Multiscale Simulation Friedrich-Alexander-Universität Erlangen-Nürnberg Nägelsbachstraße 49b 91052 Erlangen Germany Department of Geosciences University of Cologne Pohligstraße 3 50969 Cologne Germany

When a thin tube is dipped into water, the water will ascend to a certain height, against the action of gravity. While this effect, termed capillarity, is well known, recent experiments have shown that agitated granular matter reveals a similar behavior. Namely, when a vertical tube is inserted into a container filled with granular material and is then set into vertical vibration, the particles rise up along the tube. In the present Letter, we investigate the effect of granular capillarity by means of numerical simulations and show that the effect is caused by convection of the granular material in the container. Moreover, we identify two regimes of behavior for the capillary height Hc∞ depending on the tube-to-particle-diameter ratio, D/d. For large D/d, a scaling of Hc∞ with the inverse of the tube diameter, which is reminiscent of liquids, is observed. However, when D/d decreases down to values smaller than a few particle sizes, a uniquely granular behavior is observed where Hc∞ increases linearly with the tube diameter.

关键词： Classical mechanics Complex systems Wetting Dry granular materials

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