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Pattern and Dynamics of Methane/Water Two-Phase flow in Deep-Shale Illite Nanoslits

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SSRN 2024年

作者： Wang, Rui Yang, Xu Li, Gao Zheng, Wenxiu Zou, Zhenhai Sun, Chengzhen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum University Sichuan Chengdu610500 China Air and Missile Defense College Air Force Engineering University Shaanxi Xi’an710051 China Wuhan Second Ship Design and Research Institute Wuhan430202 China

Developing deep shale gas is crucial for the sustainable development of unconventional energy sources. Deep shale has a high illite content, and understanding the structure and flow behaviors of methane and water coexisting in deep shale illite nanoslits is essential for methane transport and production in deep shale reservoirs. Here, molecular dynamics simulations were performed to investigate the methane and water flow characteristics in slit-shaped illite nanopores. The effects of water saturation, acceleration, and pore size on two-phase flow are elucidated. The results show that water molecules preferentially adsorb on the surface of the illite channel. As the water saturation increases, the water phase gradually forms a water film, water bridge, and water lock, ultimately creating methane nanobubbles surrounded by the water phase. The existence of the water phase compresses the methane flow space. With increasing water saturation, the peak methane density near the channel wall gradually disappears, and the density distribution curves show parabolic shapes. The methane flow flux decreases with the increase of water saturation, mainly when the water saturation increases from 0% to 40%. In illite slits with pore sizes ranging from 2 to 4 nm, the flow rates of water and methane increase with increased pore size. These results are expected to provide insights into developing deep shale gas reservoirs, such as optimizing hydraulic fracturing design and reliably predicting production performance. © 2024, The Authors. All rights reserved.

关键词： Methane

Investigations on affinity law under gas–liquid conditions in multistage radial and mixed-flow multiphase pumps

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International Journal of Fluid Engineering

International Journal of Fluid engineering 2024年第1期1卷 56-70页

作者： Liang Chang Chenyu Yang Xiaobin Su Xiaoyu Dai Qiang Xu Liejin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Affinity laws have been widely used in pump design and simulation under high-temperature and corrosive *** applying such laws,it is possible to shorten development cycles and reduce test ***,current applications of affinity laws are still limited to liquid *** this paper,expressions for affinity laws and their applicability are investigated for multistage radial and mixed-flow multiphase pumps under gas–liquid conditions.A high-pressure(30 MPa)gas–liquid experimental platform is constructed,and three-stage and 25-stage radial pumps and a 15-stage mixed-flow pump are investigated,with specific speeds of 107 and *** gas compressibility taken into account,the gas–liquid two-phase flow rate,head,and power,and the corresponding dimensionless hydraulic coefficients,are defined for multiphase *** deterioration of gas–liquid pressurization performance is found to be divided into three processes with different dynamic mechanisms,corresponding to three flow *** inlet gas volume fraction of pump is used to judge dynamic *** the same inlet gas volume fractionsλ_(1)=λ_(2),when the gas–liquid flows in two pumps have the same flow pattern,dynamic similarity will be *** affinity law that is established shows good applicability to the three-stage radial multiphase pump,with goodness of fit R^(2)larger than 0.9 for the two-phaseΨ_(m)–Φ_(m)andΠ_(m)–Φ_(m)performance ***,experimental results indicate that the affinity law also has good applicability to multiphase pumps with different stage numbers and blade structures under gas–liquid conditions.

关键词： flow law radial

Investigations on affinity law under gas-liquid conditions in multistage radial and mixed-flow multiphase pumps

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国际流体工程（英文）

国际流体工程（英文） 2024年第1期1卷 52-66页

作者： Liang Chang Chenyu Yang Xiaobin Su Xiaoyu Dai Qiang Xu Liejin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Affinity laws have been widely used in pump design and simulation under high-temperature and corrosive *** applying such laws,it is possible to shorten development cycles and reduce test ***,current applications of affinity laws are still limited to liquid *** this paper,expressions for affinity laws and their applicability are investigated for multistage radial and mixed-flow multiphase pumps under gas-liquid conditions.A high-pressure(30 MPa)gas-liquid experimental platform is constructed,and three-stage and 25-stage radial pumps and a 15-stage mixed-flow pump are investigated,with specific speeds of 107 and *** gas compressibility taken into account,the gas-liquid two-phase flow rate,head,and power,and the corresponding dimensionless hydraulic coefficients,are defined for multiphase *** deterioration of gas-liquid pressurization performance is found to be divided into three processes with different dynamic mechanisms,corresponding to three flow *** inlet gas volume fraction of pump is used to judge dynamic *** the same inlet gas volume fractions λ1=λ2,when the gas-liquid flows in two pumps have the same flow pattern,dynamic similarity will be *** affinity law that is established shows good applicability to the three-stage radial multiphase pump,with goodness of fit R2 larger than 0.9 for the two-phaseΨm-Φm andΠm-Φm performance ***,experimental results indicate that the affinity law also has good applicability to multiphase pumps with different stage numbers and blade structures under gas-liquid conditions.

关键词： conditions radial affinity gas-liquid investigations mixed-flow multiphase multistage pumps under

Study of the intensified heat transfer of longitudinally ridged internal-finned tubes

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Reneng Dongli Gongcheng/Journal of engineering for Thermal Energy and power 2006年第3期21卷 283-286页

作者： Wu, Feng Lin, Mei Tian, Lin Wang, Qiu-Wang State Key Laboratory of Power Engineering Multiphase Flows Xi'an Jiaotong University Xi'an 710049 China

Through experiments and numerical simulation methods a study has been conducted of the characteristics of convection heat exchange of ridged internal-finned tubes and a comparison of the above characteristics with the flow and heat transfer characteristics of straight internal-finned tubes is performed. The experimental results indicate that the heat exchange characteristics of ridged internal-finned tubes are better than those of straight internal-finned tubes in terms of intensified heat transfer performance, but at the same time there is a corresponding increase in flow resistance. Through the adoption of a turbulent flow model capable of realizing k-ε equation, the flow and heat transfer process of ridged internal-finned tubes have been simulated. The calculation results are in good agreement with the experimental ones. The calculation results indicate that the periodical ridges inside the finned tubes have changed the distribution of the inner-flow fields and temperature ones. Relative to the straight internal-finned tubes, a secondary vortex flow has emerged, which is conducive to an intensified heat exchange and plays a definite destructive role to the flow boundary layer. Meanwhile, by increasing the turbulent kinetic energy of the flow field, the temperature gradient in the neighborhood of the heat exchange wall surfaces has been enhanced, contributing to an intensification of heat transfer.

关键词： Forced convection Heat transfer characteristics Intensified heat transfer Ridged internal-finned tube Secondary vortex flow

Novel Design of In-Situ Hydrogen Sorption/Storage Integrated Enhanced Hydrogen Production in Supercritical Co2 Gasification, Air Gasification, and Steam Gasification from Biomass

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SSRN 2023年

作者： Yang, Tiebing Tie Dou, Binlin Zhang, Hua Wu, Kai Ning, Luo Chen, Haisheng Xu, Yujie Li, Wei Wu, Chunfei School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China Department of Energy Engineering Zhejiang University Hangzhou310027 China School of Chemistry and Chemical Engineering Queen's University Belfast BelfastBT7 1NN United Kingdom

Novel process on in-situ hydrogen sorption/storage during water gas shift (WGS) was proposed and the enhanced hydrogen production in supercritical CO2 gasification (CG), air gasification (AG), and steam gasification (SG) from biomass was integrated. The effects of temperature, pressure, steam-to-carbon (S/C) ratio, and adsorbent content for in-situ hydrogen sorption/storage on the enhanced hydrogen production were determined. The energy and exergy analysises under different thermodynamic conditions were calculated and compared. The results show that as the temperature increases, the hydrogen conversion and yield from water gas shift (WGS) reaction with in-situ hydrogen sorption/storage based on Mg-based sorbent were greatly increased, in which SG has the highest hydrogen yield and AG has the highest hydrogen conversion. The steam-to-carbon (S/C) ratio has a positive effect on the hydrogen production for all the processes, and also presents an effect on in-situ hydrogen sorption/storage during WGS. The methanation reaction was greatly inhibited by AG. The energy requirement order was SG> CG >AG, and the system energy can be supplied by in-situ hydrogen sorption/storage. © 2023, The Authors. All rights reserved.

关键词： Biomass

Investigations of Sodium Droplet Spreading and Evaporation on Surfaces with Different Wettability Based on Lattice Boltzmann Simulations

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SSRN 2024年

作者： Tang, Songsheng Guo, Kailun Tian, Zhixing Wang, Mingjun Wang, Chenglong He, Xiaoqiang Su, Guanghui Qiu, Suizheng Tian, Wenxi School of Nuclear Science and Technology State Key Lab. of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China Key Lab. of Nuclear Reactor System Design Technology China Nuclear Power Research and Design Institute Chengdu610213 China

The spreading and evaporation of sodium droplets is one of the fundamental phenomena in high-temperature heat pipes. The LBM sodium two-phase flow and phase transition model, which can simulate a huge liquid-vapor density ratio, is first established and validated. Then, the spreading and evaporation processes of sodium droplets on solid walls with different wettability are numerically simulated and analyzed. The main conclusions obtained are as follows: (1) The dimensionless spreading diameter and time of the droplet spreading process conforms to Tanner's power law, and the power exponent has exponential relationship with the equilibrium wetting angle;(2) The maximum dimensionless spreading diameter is negatively and linearly correlated with the equilibrium wetting angle;(3) Evaporation of sodium droplets under constant heat flow conditions shows a mixed pattern. The droplets will be detached from the droplet wall at the late stage of evaporation, and the larger the equilibrium wetting angle the sooner the droplets detach. © 2024, The Authors. All rights reserved.

关键词： Evaporation

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Editorial

International Journal of Hydrogen Energy 2013年第29期38卷 12878-12878页

作者： Liejin Guo International Center for Renewable Energy Center & State Key Laboratory of Multiphase Flow in Power Engineering China

For many centuries, each generation gave to their offspring the same World that they received from their parents. The water in the rivers, seas, and oceans was clear; the forests were free to grow; and nature was empty of garbage. But everything has changed in just the last 250 years: year by year, while standards-of living increased, the Earth became a worse place for living, with less natural resources and more pollution.

关键词：

Experimental Study on Leakage of High-Energy Fluids Through Narrow Elliptical Slits

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SSRN 2024年

作者： Bi, Qincheng Zhang, Tao Zhao, Jinle Wang, Teng Yang, Zhendong Gui, Miao State Key Lab Multiphase Flow Power Engn Xi'an Jiaotong University Shaanxi Xian710049 China Department of Power Engineering North China Electric Power University Baoding071003 China State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi'an University of Technology Shaanxi Xian710048 China School of Nuclear Science and Technology Xi'an Jiaotong University Shaanxi Xian710049 China

This study is focused on the leakage flow rate of high-energy fluid passing through narrow elliptical slits with large aspect ratios, which is an issue in the application of the leak-before-break concept. Experiments were conducted using a high-temperature and high-pressure experimental platform at Xi’an Jiaotong University, where the temperature reached up to 320 ℃ and the pressure reached up to 10 MPa. These temperatures and pressures encompass a wide range of operating conditions (single-phase cold water, liquid-vapor (two-phase) mixture, and superheated steam). A series of narrow elliptical slits with different aspect ratios (528-2083) and hydraulic diameters (226-412 um) were used in the experiments. The experimental results were compared with previous model. Based on the experimental data and the the effects of the aspect ratio, the mathematical model was corrected, and the results obtained from the modified model conform well with the experimental results. © 2024, The Authors. All rights reserved.

关键词： Aspect ratio

PREFACE: SPECIAL ISSUE FOR THE 2ND INTERNATIONAL SYMPOSIUM ON THERMAL-FLUID DYNAMICS (ISTFD2021)

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Heat Transfer Research 2022年第8期53卷 V-VI页

作者： Cheng, Lixin Bai, Bofeng Guo, Zhixiong School of Energy and Power Engineering Beijing University of Technology Beijing100124 China Department of Engineering and Mathematics Sheffield Hallam University SheffieldS1 1WB United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Department of Mechanical and Aerospace Engineering Rutgers The State University of New Jersey PiscatawayNJ08854 United States