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Dicyanovinyl-unit-induced absorption enhancement of iridium(III) complexes in long-wavelength range and potential application in dye-sensitized solar cells

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Science China Chemistry 2015年第4期58卷 658-665页

作者： Dongdong Wang Hua Dong Xiaoyu Zhang Yong Wu Shaohua Shen Bo Jiao Zhaoxin Wu Min Gao Geng Wang Department of Applied Chemistry School of Science Xi’an Jiaotong University Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic and information Engineering Xi’An Jiaotong University Key Laboratory for Advanced Materials Institute of Fine Chemicals and Department of Chemistry East China University of Science and Technology International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

Iridium complexes with dicyanovinyl-grafted phenylpyridine/l-phenylisoquinoline as ligands are synthesized and their photo- physical, electrochemical, and sensitization properties in DSSCs are investigated. The iridium complexes present significantly enhanced absorption from 400 to 525 nm. The 1-phenylisoquinoline-based iridium complex show bathochromic-shift emission in DMSO solution compared with their phenylpyridine-based counterpart, while their absorption response and photoluminescence peak in solid show little difference despite extension of the conjugated system. Using DSSCs, the conversion efficiency of 0.62% and open-circuit current of 1.4 mA/cm2 is achieved. The poor performance is attributed to the excited-state properties of iridium complexes according to the TD-DFT calculation.

关键词： dicyanovinyl group iridium complexes absorption response dye-sensitized solar cell

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Investigation on flow boiling heat transfer characteristics of water in vertically-upward spirally-ribbed tubes under subcritical pressures

Investigation on flow boiling heat transfer characteristics ...

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International Conference on Power engineering, ICOPE 2015

作者： Zhang, Weiqiang Li, Huixiong Zhang, Qing Zhang, Qian Kong, Xiangfei Wu, Jinkai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road 28 Xi'an710049 China

Series of experiments have been performed at different pressures from 12 to 19 MPa, mass velocities from 400 to 1000 kg·m-2· s-1, inner wall heat fluxes from 300 to 500 kW· m-2 and bulk fluid enthalpy from 800 to 3100 kJ·kg1, to study flow boiling heat transfer characteristics of water in seven vertically-upward spirally-ribbed tubes with different rib structures. Based on the experimental results, effects of pressure, mass velocity and heat flux on flow boiling heat transfer coefficient (HTC) were discussed. It was found that, saturated flow boiling HTC was nearly invariable with an increase in mass velocity, but it increased distinctly with the increase in heat flux. As the pressure increased, the flow boiling HTC increased. Some existing correlations for predicting flow boiling HTC of water in the spirally-ribbed tubes were evaluated with the test data collected from open literatures and obtained in this experiment. On the basis of experimental results of flow boiling heat transfer from open literature and internal report, a new universal correlation for the flow boiling HTC of subcritical pressure water was developed for spirally-ribbed tubes with different rib structures, by introducing suitable dimensionless quantities of the spirally-ribbed tube structures to the existing empirical correlations. It was shown that the values calculated by the new correction are in good agreement with the experimental data for the two new-type spirally-ribbed tubes, indicating that the newly proposed universal correlation could provide good support for the application of the vertically-upward spirally-ribbed tubes. © 2015 The Japan Society of Mechanical Engineers.

关键词： Heat flux

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Development of cladding oxidation analysis code [COAC] and application for early stage severe accident simulation of AP1000

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Progress in Nuclear Energy 2015年 85卷 352-365页

作者： Mao, keyou Wang, Jun Li, Longze Zhang, Yapei Tian, Wenxi Su, Guanghui Qiu, Suizheng Corradini, Michael L. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China College of Engineering University of Wisconsin-Madison Madison 53706 United States

Abstract Clad oxidation is an important phenomenon which can affect core degradation under severe accident conditions. The oxidation process always coincides with cladding material embrittlement. The energy released from the oxidation of cladding material can accelerate the accident process, and the hydrogen released from oxidation may threaten the integrity of vessel. As a consequence, the high temperature clad solid-phase oxidation model research and its code development play an important role in reactor safety analysis. To push the research on this region, a clad solid-phase oxidation analysis code (COAC) is developed by Xi'an Jiaotong University. To verify the quality of COAC, CORA-13 is used as a benchmark. The results show that COAC does produce expected values. COAC is then applied to AP1000 severe accident calculations. In this case, the station blackout accident (SBO) is modeled. The response of fuel rods under varying natural circulation conditions while coolant pump idle time is calculated. The calculations show that the oxidation of cladding can delay fracturing, and protect its integrity. Meanwhile, the performances of other oxidation models are explored in this paper. © 2015 Elsevier Ltd.

关键词： AP1000 Clad solid-phase oxidation models COAC Hydrogen generation rate

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Dynamic analysis on methanation reactor using a double-input–multi-output linearized model

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Chinese Journal of Chemical engineering 2015年第2期23卷 389-397页

作者：李星星李佳庚杨伯伦张勇 Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Northwest Research Institute of Chemical Industry

A double-input–multi-output linearized system is developed using the state-space method for dynamic analysis of methanation process of coke oven *** stability of reactor alone and reactor with feed-effluent heat exchanger is compared through the dominant poles of the system transfer *** single or double disturbance of temperature and CO concentration at the reactor inlet,typical dynamic behavior in the reactor,including fast concentration response,slow temperature response and inverse response,is revealed for further understanding of the counteraction and synergy effects caused by simultaneous variation of concentration and *** results show that the stability of the reactor loop is more sensitive than that of reactor alone due to the positive heat ***,with the decrease of heat exchange efficiency,the reactor system may display limit cycle behavior for a pair of complex conjugate poles across the imaginary axis.

关键词： Coke oven gas methanation Synthetic natural gas Double-input–multi-output linearized system Dynamic analysis Limit cycle behavior

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Comparison of hydrogen generation rate between cora-13 test and MELCOR simulation: Clad solid-phase oxidation models using self-developed code MYCOAC

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Nuclear Technology 2015年第1期192卷 25-34页

作者： Wang, Jun Corradini, Michael L. Haskin, Troy Zhang, Yapei Lu, Qing Tian, Wenxi Su, Guanghui Qiu, Suizheng Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China University of Wisconsin-Madison College of Engineering MadisonWI53706 United States Nuclear Power Institute of China Chengdu610041 China

To better understand the MELCOR oxidation and degradation models, past work compared the MELCOR model to a CORA experiment (CORA Test 13). These MELCOR analyses specifically focused on fuel bundle heatup and clad oxidation when compared to CORA test data. The comparison allowed the authors to investigate differences between hydrogen generation data and simulation results. Several potential reasons were considered for hydrogen generation rate differences, including MELCOR input power, heat transfer modeling, the clad solid-phase oxidation model, and the gaseous steam diffusion model. This work focuses on the possible uncertainty in the clad oxidation models used in MELCOR. First, the MELCOR nodalization approach for the CORA test was reviewed. Then, the temperature history and spatial variation were examined. One main focus was to consider other clad solid-phase oxidation models to compare the MELCOR models. This was accomplished by developing a separate model, MYCOAC, using MELCOR temperature predictions as input. Finally, the mass transfer resistance of steam diffusion to the clad surface was examined and found to be a small effect. While the Baker-Just solid-phase oxidation model showed better agreement with CORA data at low temperatures, the conclusion in this paper is that the oxidation models are not the major source of uncertainty in hydrogen generation rate differences. Future work will focus on heat transfer modeling of the CORA test.

关键词： Diffusion

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Hollow MO_x-RuO_2(M=Co,Cu,Fe,Ni,CuNi)nanostructures as highly efficient electrodes for supercapacitors

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Science China Materials 2016年第5期59卷 323-336页

作者：谭强强王鹏飞刘卉徐宇兴陈运法杨军 State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Center for Mesoscience Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

engineering the internal structure and chemical composition of nanomaterials in a cost-effective way has been challenging, especially for enhancing their performance for a given application. Herein, we report a general strategy to fabricate hollow nanostructures of ruthenium-based binary or ternary oxides via a galvanic replacement process together with a subsequent thermal treatment. In particular,the as-prepared NiO-RuO_2 hollow nanostructures loaded on carbon nanotubes(hNiO-RuO_2/CNT) with RuO_2 mass ratio at 19.6% for a supercapacitor adopting the KOH electrolyte exhibit high specific capacitances of 740 F g^(-1) at a constant current density of 1 A g^(-1) with good cycle stability. The specific capacitance for hNiO-RuO_2/CNT electrodes maintains638.4 F g^(-1) at a current density of 5 A g^(-1). This simple approach may shed some light on the way for making a wide range of metal oxides with tunable nanostructures and compositions for a variety of applications.

关键词： ruthenium-based oxides hollow nanostructures galvanic replacement reaction supercapacitor specific capacitance

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Free surface vortex in a rotating barrel with rods of different heights

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International Journal of Fluid Machinery and Systems 2016年第4期9卷 325-331页

作者： Zhang, Xiaoyue Zhang, Min Chen, Wanyu Yang, Fan Guo, Xueyan School of Energy and Power Engineering University of Shanghai for Science and Technology No. 516 Jungong Road Shanghai200093 China Department of Mechanical and Electrical Engineering Henan Mechanical and Electrical Engineering College No. 699 Pingyuan Road Xinxiang453003 China Key Laboratory of Flow Control and Simulation University of Shanghai for Science and Technology No. 516 Jungong Road Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering No. 516 Jungong Road Shanghai200093 China

A bathtub vortex above the outlet of a rotating barrel is simulated. By analyzing the Ekman layer theory, it can be found that the main flow circulation is inversely proportional to the thickness of Ekman layer. The thicker the Ekman boundary layer, the weaker the rotational strength and the shorter of the length of gas core is. According to this law, models of barriers with rods of different heights are established. The reduction of air-core length in this air entrainment vortex and weakening the strength of rotation field were achieved. © 2016 Turbomachinery Society of Japan. All rights reserved.

关键词： Vortex flow

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Experimental study on pressure oscillation caused by unstable steam jet in subcooled water flow

Experimental study on pressure oscillation caused by unstabl...

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International Conference on Power engineering, ICOPE 2015

作者： Yang, Xiao-Ping Chen, Yi Zong, Xiao Liu, Ji-Ping Chong, Dao-Tong Yan, Jun-Jie MOE Key Laboratory of Thermal Fluid Science and Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The dominant frequency of pressure oscillation caused by unstable steam jet in subcooled water flow in a narrow channel was experimentally investigated. In this study, a visualized test section with rectangular channel, steam nozzle and water nozzle was designed. A high speed camera was employed to record flow patterns. In order to investigate the characteristics of pressure oscillation in the channel, several high frequency dynamic pressure transducers were arranged on the wall of the channel. The main inlet parameters, including steam mass flux, water mass flux and inlet water temperature were tested in the range of 150-400kg/(m2s), 6-18×103kg/(m2s) and 15-40°C. Two different unstable flow patterns were observed as bubble flow and oscillation jet. The dominant frequency of pressure oscillation under various test conditions was obtained by fast Fourier transform (FFT) method. The results indicated that the dominant frequency was dependent on the variation of condensation length of the steam jet. The longer the condensation length, the lower the dominant frequency. The influence of steam mass flux, water mass flux and inlet water temperature on dominant frequency was discussed. The dominant frequency would decrease with the increase of steam mass flux and inlet water temperature, but increase with the water mass flux. © 2015 The Japan Society of Mechanical Engineers.

关键词： Condensation

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Inside Cover: A Simple and Mild Approach for the Synthesis ofp-Xylene from Bio-Based 2,5-Dimethyfuran by Using Metal Triflates (ChemSusChem 11/2017)

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ChemSusChem 2017年第11期10卷 2319-2319页

作者： Lingli Ni Dr. Jiayu Xin Huixian Dong Prof. Xingmei Lu Dr. Xiaomin Liu Prof. Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 PR China Sino Danish College University of Chinese Academy of Sciences Beijing 100049 PR China

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Influence of Geometrical Structure on Inertial Focusing of Particle in the Microchannel

Influence of Geometrical Structure on Inertial Focusing of P...

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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： Liang-Liang Fan Hong Zhao Qing Yan Jing Guo Liang Zhao Jiang Zhe Fuli School of Food Equipment Engineering and Science (FEES) Xi ''an Jiaotong UniversityXi ''an P.R.China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi ''an P.R.China Department of Mechanical Engineering University of Akron Akron OH USA

Particles subjected to the inertial lift force will be focused in several equilibrium positions in *** to now, most research on inertial focusing of particles have been focused on the microchannel with a constant cros...

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