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Erosion of water-based fracturing fluid containing particles in a sudden contraction of horizontal pipe

Journal of Physics: Conference Series 2017年第1期916卷

作者： Jiarui Cheng Yinping Cao Yihua Dou Zhen Li State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China. Department of Mechanical Engineering Xi'an Shiyou University Xi'an China.

A lab experiment was carried out to study the effects of pipe flow rate, particle concentration and pipe inner diameter ratio on proppant erosion of the reducing wall in hydraulic fracturing. The results show that the erosion rate and erosion distribution are different not only in radial direction but also in circumferential direction of the sample. The upper part of sample always has a minimum erosion rate and erosion area. Besides, the erosion rate of reducing wall is most affected by fluid flow velocity, and the erosion area is most sensitive to the change in the diameter ratio. Meanwhile, the erosion rate of reducing wall in crosslinked fracturing fluid is mainly determined by the fluid flowing state due to the high viscosity of the liquid. In general, the increase in flow velocity and diameter ratio not only cause the expansion of erosion-affected flow region in sudden contraction section, but also lead to more particles impact the wall.

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A two-stage reduction process for the production of high-purity ultrafine Ni particles in a micro-fluidized bed reactor

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Particuology 2015年第2期13卷 27-34页

作者： Jun Li Xinwei Liu Li Zhou Qingshan Zhu Hongzhong Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences

A novel two-stage reduction process for synthesis of ultrafine nickel powder with a high purity and low density in a fluidized bed reactor has been developed in this work. The raw ultraflne NiO particles are first pre-reduced using hydrogen at lower temperatures （340-400 ℃）, followed by further reduction at higher temperatures （500-600℃）. The self-agglomeration of Ni particles formed during low-temperature reduction decreases the sintering activity of the newly formed ultrafine Ni particles, leading to good fluidization quality, even for the subsequent high-temperature reduction process. The agglomerated Ni particles have a high Ni content （above 99wt%）, a low density （0.78g/cm^3） and a uniform particle size （approximately 100 μm）. A concept design for a novel two-stage fluidized bed reactor process used to produce high-purity Ni powder was also proposed. This approach may be extended to the synthesis of other ultrafine/nanosized metals or metal oxides through a fluidization method.

关键词： Ultrafine Ni powder Production Fluidized bed reactor Two-stage reduction

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Design and synthesis of porous non-noble metal oxides for catalytic removal of VOCs

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Science China Chemistry 2015年第9期58卷 1359-1366页

作者： Wenxiang Tang Gang Liu Dongyan Li Haidi Liu Xiaofeng Wu Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences

The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the resultant potential applications for the degradation of volatile organic compounds(VOCs). The structure-activity relationships have been well-studied and used to facilitate design of the structure and composition of highly active catalysts. Recently, non-noble metal oxides with porous structures have been used as catalysts for deep oxidation of VOCs, such as aromatic hydrocarbons, aliphatic compounds, aldehydes, and alcohols, with comparable activities to their noble metal counterparts. This review summarizes the growing literature regarding the use of porous metal oxides for the catalytic removal of VOCs, with emphasis on design of the composition and structure and typical synthetic technologies.

关键词： VOCs catalytic oxidation non-noble metal oxides structure-activity relationships synthetic methods

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Lattice Boltzmann simulation of the deformation and breakup of a droplet impinging on a circular cylinder

Lattice Boltzmann simulation of the deformation and breakup ...

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第二届全球华人水动学学术会议

作者： Fan Yang Yuhang Fu Wanyu Chen Yonghua Yan Xueyan Guo Ren Dai School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering

The deformation and breakup behavior of a 2D droplet impinging on a solid cylinder was presented by using a multicomponent lattice Boltzmann method（LBM） with pseudopotential *** impact of Bond number（Bo）,surface wettability and the size of the cylinder on the behavior of the droplet were taken into *** show that the behaviors of the droplet can be classified into three types:1) staying on the top of the cylinder;2) breaking up into two daughter droplets and merging again;3)breaking up without the merging *** critical-Bond numbers(Bo and Bo) are defined to classify the three *** is found that Bo increases with the increase of contact angle,while Bo does the *** the size of the cylinder was increased,Bo increases respectively;however,Bo doesn't show such relation with the cylinder *** also shows that it is an effective way to control the evolution of the droplet by setting the wettability of the cylinder surface properly.

关键词： Multicomponent lattice Boltzmann method deformation and breakup of droplet wettability critical Bond number

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Thermodynamic Analysis on of Skid-Mounted Coal-bed Methane Liquefaction Device using Cryogenic Turbo-Expander

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IOP Conference Series: Materials Science and engineering 2017年第1期278卷

作者： Shuangtao Chen Lu Niu Qiang Zeng Xiaojiang Li Fang Lou Liang Chen Yu Hou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China Xinjiang Coal Research Institute Urumqi 830091 PR China

Coal-bed methane (CBM) reserves are rich in Sinkiang of China, and liquefaction is a critical step for the CBM exploration and utilization. Different from other CBM gas fields in China, CBM distribution in Sinkiang is widespread but scattered, and the pressure, flow-rate and nitrogen content of CBM feed vary significantly. The skid-mounted liquefaction device is suggested as an efficient and economical way to recover methane. Turbo-expander is one of the most important parts which generates the cooling capacity for the cryogenic liquefaction system. Using turbo-expander, more cooling capacity and higher liquefied fraction can be achieved. In this study, skid-mounted CBM liquefaction processes based on Claude cycle are established. Cryogenic turbo-expander with high expansion ratio is employed to improve the efficiency of CBM liquefaction process. The unit power consumption per liquefaction mole flow-rate for CBM feed gas is used as the object function for process optimization, compressor discharge pressure, flow ratio of feed gas to turbo-expander and nitrogen friction are analyzed, and optimum operation range of the liquefaction processes are obtained.

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Characterization of Soot Based on Variable Laser-induced Spectroscopy

Characterization of Soot Based on Variable Laser-induced Spe...

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Progress in Electromagnetic Research Symposium

作者： Yanfeng Zhang Jun Chen Huinan Yang Mingxu Su Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology

ISBN: (纸本)9781509060948

Laser-induced incandescence (LII) is a non-intrusive method of measuring time-resolved soot particle volume fraction and primary particle sizes. We also can know the component by increasing the laser energy to the regime of laser-induced breakdown spectroscopy (LIBS). More model analysis and experiments should be studied to understand the LII/LIBS.

关键词： Soot laser-induced breakdown spectroscopy LASER ENERGY Pattern analysis Filament lamps primary particulates laser-induced

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Reactive nitrogen chemistry in aerosol water as a source of sulfate during haze events in China

Reactive nitrogen chemistry in aerosol water as a source of ...

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第十三届全国气溶胶会议

作者： Hang Su Yafang Cheng Guangjie Zheng Chao Wei Qing Mu Bo Zheng Zhibin Wang Qiang Zhang Kebin He Gregory Carmichael Ulrich P?schl Institute for Environmental and Climate Research Jinan University Multiphase Chemistry Department Max Planck Institute for Chemistry State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua University College of Engineering University of Iowa Center for Global and Regional Environmental Research University of Iowa

Fine particle pollution associated with winter haze threatens the health of over 400 million people in the North China *** is a major component of fine haze *** sulfate concentrations up to 00 μg m were observed during the January 2013 winter haze event in ***-of-the-art air quality models relying on sulfate production mechanisms that require photochemical oxidants, cannot predict these high levels due to the weak photochemistry activity during haze *** find that the missing source of sulfate and particulate matter can be explained by reactive nitrogen chemistry in aerosol *** aerosol water serves as a reactor where the alkaline aerosol components trap SO, which is oxidized by NO to form sulfate, whereby high reaction rates are sustained by the high neutralizing capacity of the atmosphere in northern *** mechanism is self-amplifying because higher aerosol mass concentration corresponds to higher aerosol water content leading to faster sulfate production and more severe haze pollution.

关键词： Reactive nitrogen chemistry in aerosol water as a source of sulfate during haze events in China

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Influence of differential pressure fluctuation on flow measurement of gas-liquid two-phase flow in orifice plate

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第10期37卷 2136-2141页

作者： Zheng, Xue-Bo Fan, Chen Che, Yu-Quan Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Oil and Gas Technology Institute of Changqing Oilfield Company Xi'an710021 China PetroChina Xinjiang Oilfield Branch Company Karamay834000 China

Differential pressure fluctuation is an inherent physical phenomenon in gas-liquid two-phase flow, which can be used to measure the quality and the whole flowrate. In order to study the influence of differential pressure fluctuation on gas-liquid two-phase flow metering for orifice plate, the differential pressure fluctuating processes under different flow conditions were measured, with the pressure ranging from 0.7 MPa to 1.0 MPa, the gas mass flow rate ranging from 200 kg/h to 400 kg/h, and the quality ranging from 0.4 to 1.0, respectively. The experimental results show that the mean value of the differential pressure and the standard deviation of the differential pressure could reflect changes of the flow parameters of the two-phase flow, whereas the standard deviation of the differential pressure is with poor repeatability. In the experiments, the repeatability of the standard deviation varied in the range of ±0.3%~±18.5%. For the two phase flow with low liquid content (LVF © 2016, Science Press. All right reserved.

关键词： flow measurement

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A measuring method for 3-D movement of particles using single-lens dual-camera system

A measuring method for 3-D movement of particles using singl...

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IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Minhua Jia Wu Zhou Na Jin Xiaoshu Cai 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 Shanghai China

ISBN: (纸本)9781509018185

A 3-D measuring method for particle movement was established by using a single-lens dual-camera system. The light through an object-space telecentric lens was split half-and-half by a beam splitter and then are received by two CCD industrial cameras, respectively. These two image sensors have different distances from the telecentric lens. As for the same imaging particle, two images with different degrees of defocus will be captured. These two images were used to solve the ambiguous problem of 3-D particle positions. Combining with the PTV technology and the single-frame and multiple-exposure imaging method, the system can determine the magnitude and direction of 3-D velocity. The feasibility was then proved by experiments.

关键词： Atmospheric measurements Particle measurements Lenses Cameras Measurement by laser beam Velocity measurement

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Improved Measurement Characteristics of Elemental Compositions Using LaserInduced Breakdown Spectroscopy

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Spectroscopy (Santa Monica) 2016年第1期31卷 22-35页

作者： Wang, Z. Deguchi, Y. Katsumori, S. Ikutomo, A. Yan, J. Liu, J. Tainaka, K. Tanno, K. Watanabe, H. Kurose, R. Graduate School of Advanced Technology and Science State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Tokushima University Xi'anTokushima China Graduate School of Advanced Technology and Science Tokushima University Japan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China Key Laboratory of ThermoFluid Science and Engineering Xi'an Jiaotong University China Central Research Institute of Electric Power Industry Energy Engineering Research Laboratory Kanagawa Japan Department of Mechanical Engineering Kyushu University Fukuoka Japan Department of Mechanical Engineering and Science Kyoto University Kyoto Japan

Rapid detection of coal and fly ash is significant to improve the efficiency of thermal power plants and reduce environmental pollution. Given its fast response, high sensitivity, real-time, and noncontact features, laser-induced breakdown spectroscopy (LIBS) has a great potential for online measurement in these applications. The direct measurement of particles and gases using LIBS has been studied, and the method has been shown to be effective for this application.

关键词： Laser induced breakdown spectroscopy

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