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Synthesis of AgI/Bi2MoO6 nano-heterostructure with enhanced visible-light photocatalytic property

Progress in Natural Science:Materials International 2018年第2期28卷 235-241页

作者： Li Zhang Hongcheng Teng Jiancheng Zhou Yueming Sun Naixu Li Maochang Liu Dengwei Jing School of Chemistry and Chemical Engineering Southeast University Department of Chemical and Pharmaceutical Engineering Southeast University Chengxian College Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research Southeast University International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Suzhou Academy of Xi'an Jiaotong University

A novel nano-heterostructure of Ag I/Bi2MoO6photocatalyst was successfully synthesized via a facile depositionprecipitation method. The samples were systematically characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoemission spectroscopy, UV–Vis absorption spectroscopy, and photoluminescence spectra. While sole Bi2MoO6or Ag I showed poor activity toward photocatalytic rhodamine B degradation, the nano-heterostructure was found with superior performance. The AgI/Bi2MoO6composite with an optimal content of 20 wt% Ag I exhibited the highest photocatalytic degradation rate. Rhodamine B was totally degraded within 75 min visible-light irradiation. Moreover, the hybrid photocatalyst also showed a fairly good stability for several-cycle reuse. This study indicates that the AgI/Bi2MoO6nano-heterostructure can be used as an effective candidate for photocatalytic degradation of organic pollutants.

关键词： Heterostructure Photocatalyst RhB-degradation

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Identification of the Gas/Solid two phase flow regime based on electrostatic sensor and HHT 6

Identification of the Gas/Solid two phase flow regime based ...

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6th World Congress in Industrial Process Tomography

作者： Dong, Jun Hu, Hongli Zhang, Juan Zhao, Qinxing Zhou, Qulan State Key Laboratory of Electrical Insulation for Power Equipment Xi’an Jiao tong University Xi’an710049 China State Key Laboratory of Multiphase Flow for Power Engineering Xi’an Jiao tong University Xi’an710049 China

ISBN: (纸本)9780853163220

In the gas/solid twophase system, particles can accumulate a large number of electrostatic charges because of the collision, friction and separation between particles or between particles and wall. When particles moving through in the electrostatic sensor, the sensor induces fluctuated signal because of the constantly fluctuation of the quasielectrostatic filed around the sensors. Through the detection and processing of the induced fluctuated charge signal, measuring system can obtain twophase flow parameters, such as concentration, flow regime. This paper used electrostatic sensor to measure the moving electric charges carried by solid particles in pipelines of pneumatic transport. And a microcomputer and NI PCI 6024based measuring system has been built on the basis of the method for measuring the electric charges of solid particles. Then the Hilbert–Huang transform (HHT) was used to process the fluctuation signal generated induced by the electrostatic sensor. The result show that marginal Hilbert spectrum of the electrostatic signal can be used to identify the gassolid flow regime. © 2010, International Society for Industrial Process Tomography. All rights reserved.

关键词： Hilbert-Huang transform

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Enhancement of flow-jet combined boiling heat transfer of FC-72 over micro-pin-finned surfaces

Enhancement of flow-jet combined boiling heat transfer of FC...

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作者： Zhang, Yonghai Wei, Jinjia Guo, Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China YanTai WanHua Group YanTai 264000 China

For highly efficient solving of the power dissipation problem of electronic components with high heat flux, experimental study of the flow-jet combined boiling heat transfer on silicon chips was conducted. Micro-pin-fins with dimensions of 30×60 μm2 and 30×120 μm2 (thickness × height) were fabricated on the chip surfaces by the dry etching technique. The experiments were made at three different cross-flow velocities Vc (0.5, 1.0, 1.5 m/s) and different jet velocities V j (0-2 m/s) with two liquid subcooling ΔTsub (25°C and 35°C). A smooth surface was also tested for comparison. The micro-pin-fins showed a considerable heat transfer enhancement due to an increase in effective heat transfer surface area caused by micro-convection around micro-pin-fins. The maximum allowable heat flux qmaxis increased and the wall superheat is decreased greatly. For a given Vc, the heat transfer enhancement is more significant as Vj increases, but the qmax increment decreases as Vc increases. The fin efficiency decreases as Vcor/and Vj increases or the heat flux q increases. The maximum q max can reach 161 W/cm2 at Vc == 1.5 m/s, Vj = 2 m/s, ΔTsub = 35°C for chip PF30-120. © 2012 by Begell House, Inc.

关键词： Heat flux

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Three-dimensional modeling and thermal hydraulic analysis of high temperature gas-cooled reactor core 27

Three-dimensional modeling and thermal hydraulic analysis of...

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27th International Conference on Nuclear engineering: Nuclear power Saves the World!, ICONE 2019

作者： Zhang, Shuangbao Li, Liangxing Xie, Wei Wang, Kailin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road 28# Xi'an city710049 China

ISBN: (纸本)9784888983051

The high temperature gas-cooled reactor (HTR) is an advanced reactor with the characteristics of Generation IV nuclear energy system which has attracted wide attention due to the excellent performances of inherent safety, economy, high efficiency and low carbon environmental protection. Accurate and reliable thermal hydraulic analysis is of great significance for studying the flow and heat transfer in the core of HTR. Based on the coolant flow and heat transfer process in the core of HTR, this study establishes a three-dimensional coupled model by using CFD (Computational Fluid Dynamics) software firstly, and the flow and heat transfer process of helium coolant is simulate in the core. The temperature variation in the reactor is calculated under the conditions of steady-state operation of the HTR core, and the calculation results by the present models were compared with calculated results from the benchmark software of Thermix and the related published results. The results showed that the average temperature of the outlet section is 759.6 ℃, and the maximum relative error with the published data is 1.25%. The steady-state results under the full power conditions based on the three-dimensional model are in good agreement with the calculation data from those of THERMIX. It stated that the three-dimensional model can be employed to simulate the thermal hydraulic analysis for HTR. On this basis, the heat transfer characteristics of core is simulated under 50% full power, and the are result helpful for the operation and design of HTR. © 2018-2019 by JSME

关键词： Porous materials

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Study on ignition delay times of dimethyl ether/propane/O2/Ar mixtures at elevated pressures

Study on ignition delay times of dimethyl ether/propane/O2/A...

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9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Hu, Erjiang Pan, Lun Zhang, Zihang Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an Shaanxi 710049 China

Ignition delay times of dimethyl ether (DME) and propane blends were measured in a shock tube at varied DME blending ratios (0%, 20%, 50%, 80%, 100%), equivalence ratios (0.5, 1.0, 2.0), temperatures (1100-1500 K) and pressures of 20 atm. Mechanism validations were conducted using different chemical kinetic models. A new C5 chemical model with DME sub-model was developed and it can well predict experimental ignition delay times of pure propane, DME and their blends. Experimental and numerical results show that with the decrease of temperature, the ignition delay times increase and the activation energy decreases slightly. With the increase of equivalence ratio, ignition delay times increase for propane and decrease for DME in this study. Ignition delay times decrease with the increase of DME blending ratio and the decrease rates become larger with the increase of equivalence ratio. The peak values of H and OH mole fraction increase with increasing the DME blending ratio, and they promote the ignition of DME/propane blends. Sensitivity analysis shows that the reaction rates of R1 and R353 increase with the increase of DME blending ratio and induces the decrease of the ignition delay time of DME/propane blends.

关键词： Ethers

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Experiment of flow boiling heat transfer on micro-pin-finned chips with jet impingement

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2011年第1期45卷 31-37页

作者： Guo, Dong Wei, Jinjia Zhang, Yonghai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The experiment of flow boiling heat transfer on micro-pin-finned chips in FC-72 with jet impingement was *** experimental conditions consisted of two different liquid subcooling degrees (25,35°C),three different cross flow velocities (Vc=0.5,1,1.5 m/s) and three different jet velocities (Vj=0,1,2 m/s).The dimensions of the silicon chips were 10 mm×10 mm×0.5 mm (length×width×thickness) on which two kinds of micro-pin-fins with the dimensions of 30 μm×120 μm,50 μm×120 μm (thickness×height) were fabricated by the dry etching technique. A smooth surface was also tested for comparison. The correlations for nucleate boiling curves and the maximum allowable heat flux curves were obtained. The results show that the heat transfer performance was improved with increasing liquid subcooling and flow velocity. All micro-pin-finned surfaces displayed a considerable heat transfer enhancement. The addition of jet impingement further enhanced the heat transfer at a high heat flux and increased the CHF. At a certain cross flow velocity, the enhancement was more significant as the jet velocity increased, especially for Vc=0.5 m/s, Vj=2 m/s. For the micro-pin-finned chips, the CHF increased by more than 93% while the subcooling was 35°C compared with Vc=0.5 m/s, Vj=0 m/s. As the cross velocity increased, the intensification degree of jet impingement decreased and the increase of CHF also decreased.

关键词： flow velocity

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Experimental Research on flow Pulse Characteristics of Pressurized-Liquid-Screen Bed

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第10期38卷 2183-2189页

作者： Hu, Zheng-Tao Li, Lian Li, Na Zhou, Qu-Lan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The experimental monitoring system of pressurized-liquid-screen bed was designed and set in this paper. The flow characteristics were studied especially the analysis of differential pressure pulse characteristics and friction factors variation by the way of adjusting gas flow, liquid flow and operation pressure parameters. According to the analysis of comparing experiment data and theory, the variation principle of pressure pulse intensity and friction factors under different gas flow, liquid flow and operation pressure was revealed as well as the optimal operation parameter was analyzed through combining the principle of fume desulfurization gas-liquid interactive reaction. This paper provides the crucial design references to the industrial application of pressurized-liquid-screen gas-liquid reaction system. © 2017, Science Press. All right reserved.

关键词： flow of gases

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A New Structure of Cooling Wall Tube for Supercritical CO_(2)Coal-Fired power Plants

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Journal of Thermal Science 2023年第3期32卷 1239-1250页

作者： WANG Yanjuan GAO Shuo JIANG Qiongqiong LI Yi LIU Qibin XU Jinliang The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power UniversityBeijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

In terms of developing supercritical CO_(2)(sCO_(2))coal-fired power plants,enhancing cooling wall performance is one of significant factors to improve system *** this paper,a new cooling wall tube structure is proposed to match the non-uniform heat flux(NUH)with the thermal resistance by changing the cooling wall tube eccentricity.A three-dimensional multi-physical coupling model of cooling wall is constructed to compare the novel structure to the conventional *** properties of fluid dynamics,thermal stress,coupled heat transfer and cooling wall deformation are *** contrast to the traditional structure,the maximum temperature and circumferential temperature difference(CTD)of the proposed structure can be reduced by 2%and 27.4%,*** essential working parameters related to the performances of the cooling wall tube are *** maximum temperature of the new structure is reduced by 8-13 K and the maximum thermal stress is reduced by about 10%-15%under all the simulated working conditions when the eccentricity changes from 0 to *** proposed structure can effectively reduce the maximum temperature and circumferential temperature gradient under ***,a novel insight is put out for the design and optimization of the cooling wall tube in coal-fired power plants.

关键词： supercritical carbon dioxide cooling wall tube thermal-hydraulic structural coupling supereritical heat transfer

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Regulation on polymerization degree and surface feature in graphitic carbon nitride towards efficient photocatalytic H2 evolution under visible-light irradiation

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Journal of Materials Science & Technology 2022年第3期98卷 160-168页

作者： Cheng Cheng Chung-Li Dong Jinwen Shi Liuhao Mao Yu-Cheng Huang Xing Kang Shichao Zong Shaohua Shen International Research Center for Renewable Energy(IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering(MFPE)Xi'an Jiaotong University(XJTU)28 West Xianning RoadXi’an 710049China Department of Physics Tamkang University151 Yingzhuan RoadTamsui 25137TaiwanChina

A kind of graphitic carbon nitride(TSC-550) with high polymerization degree and improved surface property was prepared by a new precursor of thiosemicarbazide. The sulfur motif and high nitrogen content in thiosemicarbazide promoted the polymerization of thiosemicarbazide to form graphitic carbon nitride framework with high degree of polymerization, which significantly influenced the electronic structure and surface chemical properties. TSC-550 possessed a narrow bandgap of 2.19 eV that facilitated the utilization of visible light, and possessed a less positive charge, acidic surface that resulted in enhanced hydrogen adsorption ability in water solution, which promoted the H;evolution kinetics. In addition, the extended π-conjugated electronic system promoted the separation and migration of photogenerated charge carries in plane of TSC-550 framework, as well as the increasing interlayer C–N interactions in TSC-550 created conductive paths across the layers to tunnel interlayers for rapid electron transportation. As a result, TSC-550 nanosheets showed excellent photocatalytic H;production activity,the AQY achieved 36.4% at 425 nm.

关键词： Degree of polymerization Graphitic carbon nitride Photocatalysis Solar energy Hydrogen

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Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2019年第3期40卷 587-593页

作者： Niu, Xiao-Juan Yuan, Huai-Jie Quan, Chen Bai, Bo-Feng Zhao, Liang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The characteristics of R134a boiling heat transfer in a vertically helically coiled tube are studied. The experimental parameters are as follows: the heat flux is 10∼60 kW•m-2, the mass flux is 195∼400 kg•m-2 •s-1, the pressure is 0.8∼1.1 MPa, and the outlet vapor quality is 0.1∼0.9. The experimental data are compared with the existing correlations of boiling heat transfer coefficient. Based on the analysis of boiling heat transfer mechanism, a new correlation for boiling heat transfer in coiled tube is proposed. The circumferential distribution characteristics of wall temperature and heat transfer coefficient are analyzed. The wall temperatures at inner and top side are relatively higher, and the heat transfer coefficients at the bottom and the outer side are relatively higher. The local heat transfer coefficients are compared with the new correlation proposed in this paper. The results show that the heat transfer coefficients at top and bottom sides can be predicted by the new correlation. However, the new correlation underestimates the heat transfer coefficient at the outer side and overestimates that at the inner side, the deviations are 16.6% and -11.9% respectively. © 2019, Science Press. All right reserved.

关键词： Heat transfer coefficients

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