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Solute Layers and Double‐Diffusive Interfaces during the Solidification of NH4Cl‐H2O in Rectangular Cavities

AIP Conference Proceedings 2010年第1期1207卷 864-870页

作者： Z. X. Wen J. Lu B. F. Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

flow and temperature fields during the solidification of hypereutectic and hypoeutectic NH4Cl‐H2O solution in rectangular cavities were measured by a particle image velocimetry(PIV) and a weak perturbation thermocouple network, respectively. Double‐diffusive convections caused by the coupling effects of temperature and solute gradients were studied by the experiment. During the solidification of hypereutectic solution, the rejected water near the solidification interface will lead to dilute solute layers and double‐diffusive interfaces. As the continued rejection of water, the layer and interface will evolve into instability and a multi‐layer and multi‐interface structure will be formed. To the hypoeutectic solution, the rejection of NH4Cl near the solidification interface will form a dense solute layer. When the thickness of the dense solute layer is large enough, the coupling effects of stabilizing solute gradient and unstable temperature gradient will lead to new solute layers. The solute layers and double‐diffusive interfaces will evolve stably and have no breakup of the double‐diffusive interfaces during the solidification of hypoeutectic solution.

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New revised correlation to predict pressure drop for oil-gas two-phase flow through horizontal pipe

New revised correlation to predict pressure drop for oil-gas...

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International Petroleum Technology Conference 2007, IPTC 2007

作者： Liu, Wenhong Guo, Liejin Zhang, Ximin Lin, Kai Yang, Long Feng, Yaorong Tubular Goods Research Center of CNPC Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

ISBN: (纸本)9781615673360

An experimental investigation on oil-gas two-phase flow through a straight horizontal plexiglas pipe within 40mm inner diameter was conducted. The superficial velocity ranges of oil and air were 0.05-0.612m/s and 0.024-50.64m/s, respectively. The atmospheric temperature condition was maintained throughout the *** frictional pressure drop multiplier of two-phase flow was expressed using the Lockhart-Martinelli parameter correlation in accordance with typical flow pattern, but the modification factor C in the correlations was defined afresh according to flow conditions. New predict correlations for pressure gradient in accordance with typical flow patterns were proposed and the mechanisms of pressure drop production were analyzed for each flow patterns. The proposed models give a good agreement with the experimental data. Copyright 2007, International Petroleum Technology Conference.

关键词： Two phase flow

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MULTIPLE SOLVERS FOR IMPLICIT TEMPERATURE CALCULATION OF HEAT CONDUCTION WITH THE MPS METHOD 15

MULTIPLE SOLVERS FOR IMPLICIT TEMPERATURE CALCULATION OF HEA...

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15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics, WCCM-APCOM 2022

作者： Li, Sijun Zhong, Yubao Cai, Qinghang Xiao, Xinkun Guo, Kailun Chen, Ronghua Tian, Wenxi Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this study, an implicit algorithm and different solvers are applied to the Moving Particle Semi-Implicit (MPS) method for temperature calculation. The original MPS method uses an explicit method for temperature calculation and is limited by time increment due to diffusion number. In this paper, the heat conduction of plates with Dirichlet boundary condition and Neumann boundary condition is studied. The accuracy of explicit and implicit calculation of plate heat transfer cases are compared. In addition, different solvers are compared. Consequently, it is shown that the error of the implicit algorithm is not much different from the original one. And CG is still the better solver, CGS is also a superior solver. The implicit algorithm increases the size of a single time step by a maximum of 50 times (original diffusion number is 0.2), while the calculation time of a single time step does not increase Substantially, so it has a significant effect on the acceleration of calculation. © 2022 WCCM-APCOM 2022 - 15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics. All rights reserved.

关键词： Heat conduction

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Comparison of Dynamical System Scaling and Hierarchical Two-Tiered Scaling applications with Definite Solution Analogy Theory to the passive residual heat removal system of Fluoride-Salt-cooled high-Temperature Advanced Reactor 20

Comparison of Dynamical System Scaling and Hierarchical Two-...

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20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023

作者： Li, Xinyu Zhang, Dalin Zhou, Xingguang Lv, Xindi Jiang, Dianqiang Wu, Zhiyuan Li, Sijun Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9780894487934

The Passive Residual Heat Removal System (PRHRS) of Fluoride-Salt-cooled high-Temperature Advanced Reactor (FuSTAR) has already been designed and scaled by the Hierarchical Two-Tiered Scaling (H2TS).However, considering the difficulties to identify the distortion of the dynamic response, the Dynamical System Scaling(DSS) method was also adopted for comparison in this ***, based on the dimensionless governing equations without any common assumptions of the natural cycle process in PRHRS, the Definite Solution Analogy Theory (DSAT) was put forward in this study to calibrate dimensionless numbers based on differential *** the parameters of geometric and thermohydraulics were re-evaluated by the DSS method and compared with those from the H2TS *** results show that H2TS and DSS are equivalent in experimental design results under the constraint of *** H2TS method is better at accurately quantifying the deviation item by item, while the DSS method can find the most suitable experimental structure more quickly. © 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

关键词： Hierarchical systems

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Modulating conductivity type of cuprous oxide（Cu2O） films on copper foil in aqueous solution by comproportionation

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Journal of Materials Science & Technology 2019年第8期35卷 1570-1577页

作者： Changwei Tang Xiaohui Ning Jian Li Hui-Lin Guo Ying Yang Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of EducationCollege of Chemistry & Materials ScienceNorthwest UniversityXi'an 710127 China National Demonstration Center for Experimental Chemistry Education Northwest UniversityXi'an 710127 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049 China

Cuprous oxide(Cu2O)is an attractive material for photoelectrochemical(PEC)hydrogen production or photovoltaic application,because of its appropriate band gap,low material cost and *** this paper,Cu2O films were obtained by comproportionation in acid cupric sulfate solutions with varying concentrations of potassium *** and electrochemical experiments,such as zero-bias photocurrent responses,voltammograms,and Mott-Schottky measurements,show that the Cu2O films grown in low(≤0.75 mol dm^–3)and high(≥1.00 mol dm^–3)nitrate ion concentrations presented n-type and p-type conductivity,*** circuit potential and polarization behavior were monitored to investigate the mechanism of modulating conductivity *** ions consume protons in the plating solution during comproportionation with different concentrations of nitrate ions creating different pH at the Cu2O/solution *** gradient leads to the transformation of Cu2Ofilms conductivity changing from n-type to p-type with increasing the concentration of nitrate ions in the plating *** method could be used to fabricate homojunction electrode on metal substrate for PEC hydrogen production or photoelectric application.

关键词： Cuprous oxide(Cu2O) Comproportionation Semiconductor films Tuning conductivity Photoelectrochemical cell

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Simulation of a solar tower thermal power plant using TRNSYS

Simulation of a solar tower thermal power plant using TRNSYS

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26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013

作者： Yang, Yan Zhang, Fan Cao, Fei Zhao, Liang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Shanghai Electric Power Generation Group Co. Ltd. Shanghai China

The solar tower thermal power technology is a method to achieve the large-scale utilization of solar energy. A user defined TYPE of the heat receiver for the solar tower thermal power plant (STTPP) is established in the TRNSYS program with Fortran codes. Full-year simulation of the STTPP is investigated based on different input parameters, weather conditions and plant control strategies by taking Beijing as a case study. Through this case, the influences of the receiver diameter, flow form and inlet/outlet temperature on the thermal efficiency, total pump power, power efficiency and 'solar-thermal-electricity' transfer efficiency are studied. Simulation results show that the thermal efficiency of receiver rises with the decrease of pipe diameter. The lower the inlet temperature is;the lower the annual pump power consumption is, and the higher the power efficiency would be. An instantaneous increase of the receiver outlet temperature would reduce the power efficiency. The plant control strategies suggest that the "south-in-north-out" arrangement of the heat receiver working fluid holds the highest power efficiency but lowest annual pump power consumption. The annual power generation increases effectively by introducing the hot and cold molten salt storage tanks. The annual power efficiency increases with the power plant capacity.

关键词： Electric power utilization

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Influence of active and passive equipment for advanced pressurized water reactor on thermal hydraulic and source term behavior in severe accidents

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Energy Storage and Saving 2023年第1期2卷 392-402页

作者： Jishen Li Bin Zhang School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China

Extensive studies have been carried out on the behavior of core degradation and fission products of common pressurized water reactors(PWRs).However,few of them have investigated the relationship between thermal hydraulic and fission product behavior in advanced passive *** to the impact of thermal hydraulic be-haviors in different accident sequences on the release and transportation of fission products,an integrated severe accident analysis(ISAA)code with highly coupled thermal hydraulic and source term calculations is required to simultaneously analyze thermal hydraulic and source term *** advanced passive PWRs,important safety systems that may affect the behavior of the core and fission products should be *** is therefore necessary to simulate the thermal hydraulic and fission product behavior of advanced passive *** this study,the ISAA code is adopted to simulate the occurrence of a hypothetical double ended cold leg LBLOCA of HPR1000 in three scenarios of equipment *** results show that the high-temperature fuel rods and cladding ma-terials exhibit delayed failure at the lower position of the active core,whereas earlier failure at higher position during the *** and passive equipment affects fuel temperature,the oxidation conditions of the fuel,the interaction of fission products and structural materials,and the state of the fuel,thereby affecting the release of fission products in the ***1000 only relies on passive equipment to relieve the core degradation in severe accidents,realize the in-vessel retention of melt,and eliminate the ex-vessel release possibility of fission *** is hoped that the results can provide references for HPR1000 to formulate the severe accident management guidelines(SAMG).

关键词： Nuclear safety LBLOCA Severe accident Source term HPR1000 Active and passive equipment

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Modeling the evolution of aeolian sand transport in a wind tunnel

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AIP Conference Proceedings 2013年第1期1547卷 758-765页

作者： Fengjun Xiao Liejin Guo Debiao Li Yueshe Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

An Eulerian-Lagrangian numerical simulation is performed to study aeolian sand transport in a wind tunnel. The evolutions of three parameters, sand mass flux, decay rate of sand mass flux profile and sand particle mean horizontal velocity with time, are investigated. The results show that: Sand mass flux takes more time to reach the saturated state than the last two parameters. First, we prove the evolution with time in the simulation is similar to the evolution in the length direction in a wind tunnel and then the experimental data from unsaturated wind tunnel can be used in the quantitative comparison with simulated saturated results. Second, detailed comparison is carried out. The tendency of sand mass flux is consistent with the experimental data. Decay rate of sand mass flux profile and sand particle mean horizontal velocity fit the experimental data well especially for cases of small free stream wind velocity, and the deviation is getting larger with the increasing of free stream wind velocity.

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A New Model Coupling Interface Tracking Methods and Two‐Fluid Model for Simulation of Incompressible Gas‐liquid Two‐Phase flow

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AIP Conference Proceedings 2010年第1期1207卷 843-848页

作者： K. Yan Y. B. Zhang D. C. Che Z. H. Lin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

A model coupling two basic models, the model with interface tracking method and two‐fluid model, for simulation of incompressible gas‐liquid two‐phase flow is proposed. A united solution frame shared by the two basic models is built. In the shared solution frame, the Navier—Stokes equations of the two basic models can be dealt with in a uniform form. In the proposed model, there are three phases, which are divided not only by physics but also by the length scale of interface, including the liquid phase, the large‐length‐scale‐interface gas phase and the small‐length‐scale‐interface gas phase. The special treatment named by “void fraction redistribution” is adopted for the special grids which contain all three phases. Based on the united solution frame, MCBA—SIMPLE algorithm is used to solve the equations. Two problems are calculated to show that the proposed model has the merits of the two basic models.

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Corrigendum to “Enhanced oxygen reduction reaction activity of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ cathode via Pr-doping for intermediate-temperature solid oxide fuel cells” [J. Alloys Compd. 1022 (2025), 179947]

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Journal of Alloys and Compounds 2025年 1024卷

作者： Benlin Xiang Weihua Jia Yuqi Wang Fei Li Weibin Xu Xinyi Li Jianbing Huang Quanyi Tang Xin Ding Le Wu Lan Zheng School of Chemical Engineering Northwest University Xi’an Shaanxi 710127 China Xi'an Key Lab of Green Hydrogen Energy Production Storage & Application Integration Technology Xi’an Shaanxi 710127 China Shaanxi Key Laboratory for Carbon Neutral Technology Xi’an Shaanxi 710069 China School of Carbon Neutrality College Northwest University Xi’an Shaanxi 710127 China State Key Laboratory of Multiphase Flow in Power engineering Xi’an Jiaotong University Xi'an Shaanxi 710049 China

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