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SSRN 2024年

作者： Wang, Ze Zhu, Lei Zhang, Jiaxin Wang, Jingzhao Cui, Xiangming Chen, Xin Liu, Wenbiao Ma, Hang Wang, Jianan Yan, Wei Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi’an710049 China School of Physics and Electrical Engineering Weinan Normal University Chaoyang Street Weinan714099 China Center of Research & Development Yunnan Yuntianhua Co. LTD 1417 Dianchi Road Kunming650228 China

Safety issues triggered by battery thermal runaway have become the most crucial obstacle to the future development of the high-energy-density energy storage systems. As hydrogen (H2) will be inevitably generated along with heat release caused by the side reactions in the early stages of battery thermal runaway, rapid monitoring of trace H2 is considered as an effective measure enabling the battery safety early warning. Herein, to develop high-performance H2 sensing materials to monitor of low-concentration H2 leakage, ZIF-8 loaded Ag/ZnO electrospun nanofibers (ZAZ NFs) were designed by electrospinning and self-sacrificial template methods. Benefiting from all the enrichment and sieving effects of ZIF-8 shell, the catalytic and sensitization effects of Ag and abundant active sites provided by Ag and ZIF-8 loading, the ZAZ sensor enables ppb-level limit of detection toward H2, fast response (9 s), high selectivity and excellent humidity resistance (36.1 to 100 ppm H2 at 95% RH). Furthermore, this ZAZ sensor also enabled the safety early warning (67.79 s before battery bulge) for practical pouch lithium cells, highlighting its great application potential in future advanced battery safety management system. © 2024, The Authors. All rights reserved.

关键词： Organometallics

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

International Journal of Fluid Engineering

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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

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Zif-L(Co) Derived Cobalt Doped In2o3 Hollow Nanofibers with High Surface Activity for Efficient Formaldehyde Gas Sensing

SSRN

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SSRN 2023年

作者： Zhu, Lei Wang, Jianan Liu, Jianwei Wang, Ze Sun, Shiyi Li, Mingtao Yan, Wei Xi’an Key Laboratory of Solid Waste Resource Regeneration and Recycling State Key Laboratory of Multiphase Flow Engineering Xi’an Jiaotong University Xi’an710049 China School of Physics and Electrical Engineering Weinan Normal University Chaoyang Street Weinan714099 China School of Chemistry and Chemical Engineering Xi’an University of Science & Technology Xi’an710054 China

Gas sensors based on semiconductor metal oxides are identified as a highly promising candidate for toxic gas detection, yet they still suffer from high operating temperature due to low surface activity at low temperature. To address this issue, we present an elaborate design for the homogeneous functionalization of ZIF-L(Co) derived cobalt (Co) catalysts into hollow In2O3 frameworks, aiming to highly activate the redox capacity and catalytic efficacy of the In2O3 sensor to HCHO gas. Benefiting from the Co catalysts doping boosts the catalytic activity and generates abundant oxygen vacancies, the optimized 1 wt% Co-doped In2O3 HNFs sensor exhibits a high response of 40.4 toward 100 ppm HCHO at a moderately low temperature of 180 ℃, which is 4 times higher than that of pristine In2O3 HNFs. Moreover, 1 wt% Co-doped In2O3 HNFs sensor has virtues of high selectivity and excellent long-term stability for HCHO sensing. This study highlights the important influence of Co catalyst on the modulation of surface active sites of metal oxides-based sensors, inspiring the development of cost-effective sensors for indoor hazardous gas monitoring. © 2023, The Authors. All rights reserved.

关键词： Cost effectiveness

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

国际流体工程（英文）

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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

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Editorial

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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.

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Drop deformation and breakup with diffuse interface method

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AIP Conference Proceedings 2010年第1期1207卷

作者： S. L. Chen C. Z. Lin L. J. Guo Y. S. Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Two‐dimensional numerical simulation of the deformation and breakup of an isolated liquid drop suspended in immiscible viscous fluid under shear flow was performed with the diffuse interface method. The governing equations of the model were described by Navier—Stokes—Cahn—Hilliard equations. The surface tension was treated as a modified stress. In the paper, the critical Capillary number was plotted as a function of viscosity ratios with the method of approximation. Besides, From the numerical observations, the breakup of the droplets occurred by three mechanisms, namely, necking, end pinching, and capillary instability. Quantitative results for the deformation and breakup of drop are presented.

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Effects of velocity ratio on turbulent mixing layer at high Reynolds number

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Journal of Physics: Conference Series 2009年第1期147卷

作者： Fude Guo Bin Chen Liejin Guo Ximin Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this paper the effect of velocity ratio on plane mixing layer was experimentally investigated by Particle Image Velocimetry (PIV). The velocity ratio between low and high speed side are 0.25 and 0.50, respectively. The Reynolds number based on the velocity difference of two streams and hydraulic diameter of the channel is 66000. The results indicate that the maximum mean Reynolds stress on the same cross section is decreasing with the velocity ratio increasing. The maximum dimensionless mean vorticity is decreasing according to an exponential law along the stream-wise direction and the decreasing speed of dimensionless mean maximum vorticity is increasing with the velocity ratio increasing. The dimensionless vorticity caused by plate wake is decreasing sharply in a very short distance along the down stream wise direction and the decreasing speed is faster when the velocity ratio is larger.

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PIV measurement of turbulent mixing layer flow with polymer additives

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Journal of Physics: Conference Series 2009年第1期147卷

作者： T Ning F Guo B Chen X Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Turbulent mixing layer flow with polymer additives was experimentally investigated by PIV in present paper. The velocity ratio between high and low speed is 4:1 and the Reynolds number for pure water case based on the velocity differences of two steams and hydraulic diameter of the channel ranges from 14667~73333. flow field and turbulent quantities of turbulent mixing layer with 200ppm polymer additives were measured and compared with pure water mixing layer flow. It is shown that the dynamic development of mixing layer is greatly influenced by polymer addictives. The smaller vortices are eliminated and the coherent structure is much clearer. Similar with pure water case, Reynolds stress and vorticity still concentrate in a coniform area of central part of mixing layer and the width will increase with the Reynolds number increasing. However, compared with pure water case, the coniform width of polymer additives case is larger, which means the polymer additives will lead to the diffusion of coherent structure. The peak value of vorticity in different cross section will decrease with the development of mixing layer. Compared with pure water case, the vorticity is larger at the beginning of the mixing layer but decreases faster in the case with polymer additives.

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Construction of a Transient Multi-Physics Model of Solid Oxide Fuel Cell Fed by Biomass Syngas Considering the Carbon Deposition and Temperature Effect

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SSRN 2022年

作者： Zhu, Pengfei Yao, Jing Wu, Zhen Huang, Si-Min Abu Mansor, Mohd Radzi Yang, Fusheng Zhang, Zaoxiao School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an710049 China Guangdong Provincial Key Laboratory of Distributed Energy Systems Guangdong Provincial Engineering Research Center of Distributed Energy Systems Dongguan University of Technology Dongguan523808 China Department of Mechanical and Manufacturing Engineering University Kebangsaan Malaysia Selangor43600 Malaysia State Key Laboratory of Multiphase Flow for Power Engineering Xi’an Jiaotong University Xi’an710049 China

Carbon deposition is a thorny issue for the SOFC fueled by low carbon hydrocarbons such as biomass syngas. Moreover, long-term large temperature gradients would reduce SOFC durability. Regarding these two issues, a two dimensional transient multi-physical model considering carbon deposition and temperature effect is developed for SOFC in this work. Typically due to the carbon deposition, the SOFC anode porosity decreases from 0.5 to 0.26, and the reaction activity decreases from 1.0 to about 0.45 after running 140 day. Accordingly, the current density decreases by 1.6 % at t =42 d and 6% at t =140 d, which indicates the damage of SOFC durability compared to the durability target (1%/1000h) of commercial SOFC. The maximum temperature difference of the cell is predicted to be about 106 o C. It was found that the carbon deposition and large temperature gradient are closely related to the operating parameters. With the increase of operating voltage from 0.4 V to 0.8 V, the porosity and reaction activity respectively increase by 50% and 55%, and the maximum temperature difference is reduced from 150 o C to 16 o C after running 140 day. The increase of the inlet temperature could improve the overall temperature and decrease the porosity. Besides, the reduction in the ratio of CH 4 to H 2 O helps to suppress carbon deposition, thus to improving the performance. © 2022, The Authors. All rights reserved.

关键词： Solid oxide fuel cells (SOFC)

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Driving with Clean Footprint: Biodiesel Application and Sustainable Development of the Transportation Sector in China

SSRN

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SSRN 2024年

作者： Chen, Chuangbin Deng, Chenchen Zhang, Bo Yang, Song Centre for Southeast Asia Studies Shantou University Guangdong Shantou City515063 China Jinhe Center for Economic Research Xi’an Jiaotong University Xianning West Road Shaanxi Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China

The advancement of global endeavors to mitigate climate change significantly hinges upon developments within China's transportation sector. This study presents a pioneering examination of the pivotal role of biodiesel as a renewable energy source, accentuating its substantial contributions to China's ambitious objectives of attaining carbon neutrality and reaching the peak of carbon dioxide emissions. Employing the Long-range Energy Alternative Planning System, we formulate five distinct scenarios encompassing the prevailing trend, the promotion of B5 (5% biodiesel blend) and B10 (10% biodiesel blend), China's existing policy framework, policies embraced by the European Union, as well as alternative biofuels. Our analysis reveals that all scenarios exhibit varying degrees of CO2 emissions reduction by the year 2040. The third scenario, driven by China's informal environmental participation, tax incentives, and supportive policies, yields noteworthy outcomes, albeit less substantial in comparison to the EU policy scenario. The B5-B10 scenario presents a more significant reduction in CO2 emissions, although it proves to be less effective in addressing other pollutant emissions in contrast to the alternative biofuel scenario. Furthermore, the adoption of B5-B10 fuels also carries significant economic advantages, with projected emissions reductions amounting to 1.17 trillion yuan (approximately 0.17 trillion dollars) by 2030. Overall, our findings underscore the global implications of China’s low-carbon transportation strategy. The mutually advantageous interactions between formal environmental policies, informal public engagement, and lessons derived from the European Union's policies collectively shape the sustainable development of China's transportation sector. © 2024, The Authors. All rights reserved.

关键词： Sustainable development

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