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The Development of Candling Module Code in Module In-vessel Degraded Analysis Code MIDAC and the Relevant Calculation for CPR1000 During Large-Break LOCA

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Journal of Nuclear engineering and Radiation Science 2016年第2期2卷 021002页

作者： Wang, Jun Fan, Yuqiao Zhang, Yapei Ni, Xinghe Tian, Wenxi Corradini, Michael L. Su, Guanghui Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi’an Jiaotong University Xi’an 710049 China College of Engineering University of Wisconsin-Madison Madison WI 53706

The occurrence of Fukushima has increased the focus on the development of severe accident codes and their applications. As a part of Chinese “National Major Projects,” a module in-vessel degraded analysis code (MIDAC) is currently being developed at Xi’an Jiaotong University. The developing situation of a candling module and relevant calculation for CPR1000 for large break loss of coolant analysis (LOCA) are presented in this paper. The candling module focuses on the melting, moving, and relocation of the melting core materials and necessary thermal hydraulic information. MIDAC’s LOCA accident calculation results of Chinese pressure reactor 1000 (CPR1000) cover the melting mass distribution, peak temperature, and hydrogen generation. The results have been compared with MAAP. Through comparison, the candling module of MIDAC proved to be able to predict the moving trend of the molten material mass relocation in the reactor pressure vessel.

关键词： Melting MIDAC CPR1000 Vessels MAAP severe accident flow (Dynamics) Accidents LOCA Temperature Hydrogen

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Molecular dynamics simulation of the adsorption of sodium dodecyl benzene sulfonate at the decane-water interface

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第5期37卷 1011-1015页

作者： Wen, Bo-Yao Sun, Cheng-Zhen Che, Yu-Quan Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Frist Gas Production Factory PetroChina Xinjiang Oilfield Branch Company Karamay834000 China

Molecular dynamics method was employed to explore the micro-characteristic of decane-water interface with the adsorption of sodium dodecyl benzene sulfonate (SDBS). We analyzed the effect of interfacial molecular arrangement on the micro-structure and properties of oil-water interface from concentration distribution and molecular conformation insights. The results show that the thickness of decane-water interface is 0.378 nm. Both decane molecules and the dipole moment of water molecules tend to be parallel to the interface. The aggregation of surfactants at the interface increases the thickness of oil-water interface, therefore weakening the oil-water interaction and disrupting the directional alignment of water and decane molecules. Meanwhile, we found that there are some cavities at the decane-water interface, combining with the strong electrostatic interaction between hydrophilic groups and water molecules, can aggravate the diffusion of water molecules at the interface, thus enhancing the deformation ability of the interface. © 2016, Science Press. All right reserved.

关键词： Molecular dynamics

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

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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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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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Corrigendum to “Huge wave and drop entrainment mechanism in gas–liquid churn flow” [Chem. Eng. Sci. 108 (2013) 638–646]

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Chemical engineering Science 2017年 158卷 624-624页

作者： Ke Wang Bofeng Bai Weimin Ma State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China Royal Institute of Technology (KTH) Stockholm 10691 Sweden

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Movement of Oil-Water-Solid Three-Phase Contact Line under Velocity Gradients

Movement of Oil-Water-Solid Three-Phase Contact Line under V...

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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： Wenxiu ZHENG Chengzhen SUN Bofeng BAI State Key Laboratory of Multiphase Flow in Power Engineering Xi ''an Jiaotong University No.28 Xianning West Road Xi''an Shaanxi China

The movement of three-phase contact line which formed in the oil-water-solid three-phase area is of great importance in a number of applications, such as oil recovery, groundwater remediation, decontamination and deinking The process of oil droplets/film migration and detachment, which are controlled by the moving contact line, has shown its great significance in oil *** are various factors which can drive the contact line to move, such as pressure and electrical driving ***, which will generate a velocity gradient for the flow near the *** this paper, we dedicate to investigate the moving rule of contact line under a velocity gradient from molecular dynamics (MD) insights.

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Mechanism study and theoretical simulation on heat split phenomenon in dual-cooled annular fuel element

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Annals of Nuclear Energy 2016年 94卷 44-54页

作者： Yangbin Deng Yingwei Wu Yuanming Li Dalin Zhang Wenxi Tian G.H. Su Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an City 710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China

In this study, the mechanisms that cause heat split, a specific phenomenon in dual-cooled annular fuel elements, were investigated. On the basis of thermal resistance analysis, the developing process of heat split phenomenon was summarized. It was found that thermal expansion, fuel densification, swelling, creep, relocation and fission gas release are the original parameters driving the development of heat split. Due to these factors, thermal resistances for heat flux to internal and external channels change with the operating time, which results in heat split. Furthermore, the theoretical simulation on heat split was performed by FROBA-ANNULAR, which is a coupled thermal–mechanical analysis code for dual-cooled annular fuel elements. key parameters at different burnup stages, including gap size, gap conductance, temperature profile, coolant flux and heat flux were obtained. The calculation result shows that the fraction of heat flux to the internal cooling channel experiences complicated variation at the range of 32.9–39.7%. In addition, it was found that heat split does not match with the coolant split, especially at the lower burnup stage. Asymmetric heat transfer occurred because of the imbalance between heat split and coolant split, resulting in a substantial asymmetric temperature profile. Furthermore, heat split exerts an influence on DBNRs of inner and outer channels, although the computational values were still within the allowable limits.

关键词： Dual-cooled annular fuel Heat split FROBA-ANNULAR code MDNBR

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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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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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Numerical Study of Evaporation and Motion Characteristics of Liquid Nitrogen Droplet in High-Speed Gas flow

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

作者： Y. Ruan L. Chen X. Liu S. Chen Y. Hou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China Xi'an Jiaotong University Suzhou Academy Suzhou 215123 PR China

In the cryogenic wind tunnel, cooling the circulating gas to cryogenic temperature by spraying liquid nitrogen (LN2) is an efficient way to increase the Reynolds number. The evaporation and motion of LN2 droplets in the high-speed gas flow is the critical process that determines the cooling rate, cooling capacity and the safe operation of the down-stream compressor. In this study, a numerical model of droplet motion and evaporation in high-speed gas flow is developed and verified against experimental data. The droplet evaporation rate, diameter and velocity are obtained during the evaporation process under different gas temperatures and flow velocities. The results show that the gas temperature has dominant influence on the droplet evaporation rate. High flow speed can increase droplet evaporation effectively at the beginning process. Evaporation of droplets with different diameters follows a similar trend. The absolute evaporation rate increases with the increase of droplet diameter while the relative evaporation amount is highest for the smallest droplet due to its high area-volume ratio. This numerical study provides insight for understanding the evaporation of LN2 droplets in high-speed gas flow and useful guidelines for the design of LN2 spray cooling.

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