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Evaporation and drying characteristics of the sessile ferrofluid droplet under a horizontal magnetic field

Fundamental Research 2022年第2期2卷 222-229页

作者： Zhaonan Liu Jiandong Zhou Yang Li Xin Zhuo Xiujuan Shi Dengwei Jing State Key Laboratory of Multiphase Flow in Power Engineering and International Research Center for Renewable Energy X^an Jiaotong UniversityXi'an 710049China

In this study,the evaporation characteristics and drying patterns of various sessile ferrofluid droplets on certain substrate under horizontal magnetic fields of controlled intensities are *** effects of droplet concentration and magnetic field intensity on the duration of each evaporation stage and drying patterns of droplets have been systematically *** turned out that a plateau appears at the initial stage of evaporation in the absence of magnetic field and it was found that the plateau value is positively correlated with the concentration of ferrofluid *** the external magnetic field,the evaporation time of droplets decreases,the stage of contact line retreat extends,the stage of late pinning mode shortens,and the deposition area of ferrofluid droplet decreases compared to that of without magnetics *** deposition area increases gradually and becomes more uniform with the increase of magnetic *** decrease of friction force which is due to the decrease of the number of nanoparticles at the contact line under external magnetic field is the main reason for the observed *** found that the coffee ring and the uniform deposition inside the droplet will be destroyed when the magnetic field intensity is higher than a critical *** work has a significant reference value for the evaporation of sessile magnetic fluid droplets under the applied magnetic field,especially when the drying pattern needs to be precisely controlled,such as in spray or biomedicine.

关键词： Ferrofluid Droplet Drying pattern Evaporation characteristics Magnetic field

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Toward practical photoelectrochemical water splitting and CO_(2) reduction using earth-abundant materials

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Journal of Energy Chemistry 2021年第10期30卷 469-488,I0013页

作者： Yubin Chen Ya Liu Feng Wang Xiangjiu Guan Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Photoelectrochemical(PEC)fuel generation from water splitting and CO_(2)reduction(CO_(2)R)utilizing solar energy holds immense potential to solve the current energy and environmental *** the past decades,numerous studies have been devoted to this fast-growing research field,and it is essential to develop efficient photoelectrodes with earth-abundant materials for the practical application of PEC systems.A thorough review of earth-abundant materials and associated devices for PEC fuel generation is beneficial to uncover the inherent obstacles and pave the way for future ***,we summarize the recent progress of earth-abundant light-absorbers and cocatalysts in the PEC *** unbiased configurations and scaling-up strategies of PEC devices using earth-abundant materials are examined.A comparison between PEC water splitting and CO_(2)R is carried out to promote better understanding of the design principles for practical materials and ***,the prospects on advanced materials,underlying mechanisms,and reaction systems of PEC water splitting and CO_(2)R are proposed.

关键词： Solar energy Photoelectrochemical technology Water splitting CO_(2)reduction Earth-abundant materials

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Synergy of porous structure and cation doping in Ta3N5 photoanode towards improved photoelectrochemical water oxidation

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Journal of Energy Chemistry 2021年第1期30卷 343-350,I0011页

作者： Yubin Chen Hongyu Xia Xiaoyang Feng Ya Liu Wenyu Zheng Lijing Ma Rui Li International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Herein,a cross-linked porous Ta3N5 film was prepared via a simple solution combustion route followed by a high-temperature nitridation process for photoelectrochemical(PEC) water ***,the metal cations(Mg2+ and Zr4+) were incorporated into the porous Ta3N5 to enhance the PEC *** porous Mg/Zr co-doped Ta3N5 photoanode yielded a photocurrent density of 1.40 mA cm^(-2) at 1.23 V vs RHE,which is 5.6 times higher than that of the dense Ta3N5 *** enhanced performance should be ascribed to the synergistic effect of porous structure and cation doping,which can enlarge the electrochemical active surface area and accelerate the charge transfer by introducing ON substitution ***,Co(OH)2 cocatalyst was loaded on the Mg/Zr-Ta3N5 photoanode to negatively shift the onset potential to 0.45 V vs RHE and further improve the photocurrent density to 3.5 mA cm^(-2)at 1.23 V ***,with a maximum half-cell solar to hydrogen efficiency of 0.45%.The present study provides a new strategy to design efficient Ta3N5 photoelectrodes via the simultaneous control of the morphology and composition.

关键词： Photoelectrochemical water oxidation Ta3N5 Porous structure Doping Solution combustion

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Surface display of CadR protein on Rhodopseudomonas palustris CGA009 for enhanced heavy metal bioremediation

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Journal of Hazardous Materials 2025年 494卷 138592页

作者： Wang, Minmin Gao, Zixuan Jiang, Qiushi Mu, Xuefang Jiang, Youmin Li, Yanjing Zhang, Sihu Cao, Wen Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road Xi'an710049 China

Heavy metal pollution poses significant ecological and public health risks, and surface display engineering shows promise for bioremediation in this area. Although anoxygenic photosynthetic purple nonsulfur bacteria (PNSB) have been effectively applied to degrade pollutants due to their metabolic versatility, the use of surface display technology in PNSB remains very limited. In this study, we constructed a surface display system using Rhodopseudomonas palustris CGA009 as the host. The metal-binding protein CadR was fused with outer membrane protein A (OmpA) and expressed in CGA009. SDS-PAGE and immunofluorescence analysis identified the successful expression of the fusion protein on the cell surface. In addition, we used flow cytometry to explore the enhancement effects of linker peptides and different promoters on surface display efficiency under different light intensities. The surface display system enhanced the heavy metal resistance of the host bacteria, and the maximum removal rate of Cd2 + reached 95.6 %. By means of Langmuir isotherm analysis, the maximum biosorption capacity of the system for Cd2+ is 101.11 mg/g. The system demonstrates feasibility for application in complex real-world environmental samples. The presence of various metal ions does not interfere with the system's specific adsorption of Cd²⁺. It can stably maintain an adsorption efficiency of over 80 % under conditions of pH 6–8, temperatures of 20–35°C, and light intensity of 1000–6000 lux. Additionally, the system achieves a removal efficiency of 94.3 % in Cd wastewater. In summary, this study provides a reference for the development of photosynthetic bacterial surface display systems and provides an advanced bioremediation strategy for heavy metal contaminated wastewater. © 2025 Elsevier B.V.

关键词： Bioremediation

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Numerical and experimental research of the characteristics of concentration solar cells

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Frontiers in Energy 2021年第2期15卷 279-291页

作者： Zilong WANG Hua ZHANG Binlin DOU Weidong WU Guanhua ZHANG Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

The development of automatic tracking solar concentrator photovoltaic systems is currently attracting growing *** concentration photovoltaic systems(HCPVs)combining triple-junction InGaP/lnGaAs/Ge solar cells with a concentrator provide high conversion *** mathematical model for triple-junction solar cells,having a higher efficiency and superior temperature characteristics,was established based on the one-diode equivalent circuit cell model.A paraboloidal concentrator with a secondary optic system and a concentration ratio in the range of 100X–150X along with a sun tracking system was developed in this *** GaInP/GalnAs/Ge triple-junction solar cell,produced by AZUR SPACE Solar power,was also used in this *** solar cells produced by Shanghai Solar Youth Energy(SY)and Shenzhen Yinshengsheng Technology ***.(YXS)were used as comparison samples in a further comparative study at different concentration ratios(200X–1000X).A detailed analysis on the factors that influence the electrical output characteristics of the InGaP/lnGaAs/Ge solar cell was conducted with a dish-style concentrating photovoltaic *** results show that the short-circuit current(Isc)and the open-circuit voltage(Voc)of multi-junction solar cells increases with the increasing concentration ratio,while the cell efficiency(ηc)of the solar cells increases first and then decreases with increasing concentration *** increasing solar cell temperature,Isc increases,while Voc andηc decrease.A comparison of the experimental and simulation results indicate that the maximum root mean square error is less than 10%,which provides a certain theoretical basis for the study of the characteristics of triple-junction solar cell that can be applied in the analysis and discussion regarding the influence of the relevant parameters on the performance of high concentration photovoltaic systems.

关键词： concentration three-junction solar cell mathematical model electrical properties solar energy

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Application-oriented hydrolysis reaction system of solid-state hydrogen storage materials for high energy density target:A review

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Journal of Energy Chemistry 2022年第11期31卷 218-238,I0007页

作者： Jing Yao Zhen Wu Huan Wang Fusheng Yang Jianwei Ren Zaoxiao Zhang School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of Mechanical Engineering Science University of JohannesburgJohannesburg 2092South Africa State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Hydrogen storage and delivery technology is still a bottleneck in the hydrogen industry *** all kinds of hydrogen storage methods,light-weight solid-state hydrogen storage(LSHS)materials could become promising due to its intrinsic high hydrogen *** reaction of LSHS materials occurs at moderate conditions,indicating the potential for portable *** present,most of review work focuses on the improvement of material performance,especially the catalysts *** part is important,but the others,such as operation modes,are also vital to to make full use of material potential in the practical *** operation modes of hydrolysis reaction have an impact on hydrogen capacity to various *** example,hydrolysis in solution would decrease the hydrogen capacity of hydrogen generator to a low value due to the excessive water participating in the ***,application-oriented operation modes could become a key problem for hydrolysis reaction of LSHS *** this paper,the operation modes of hydrolysis reaction and their practical applications are mainly *** implements of each operation mode are discussed and compared in detail to determine the suitable one for practical applications with the requirement of high energy *** current challenges and future directions are also discussed.

关键词： Solid-state hydrogen storage High energy density Hydrogen generator Hydrolysis reaction Portable applications

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DYNAMIC CHARACTERISTICS AND CONTROL STRATEGY OPTIMIZATION OF A 1000 MW LIGNITE-FIRED power UNIT INTEGRATED WITH PRIMARY AIR HEATER

DYNAMIC CHARACTERISTICS AND CONTROL STRATEGY OPTIMIZATION OF...

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ASME 2024 power Conference, power 2024

作者： Li, Mengjie Li, Maoliang Yin, Chaoqiang Liu, Ming Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Chengdu China Dongfang Electric group Dongfang Boiler Co. LTD Sichuan Zigong China

ISBN: (纸本)9780791888186

Lignite is a kind of low rank coals with abundant reserves, and it is cost-effective for power plants. However, the moisture content is about 30% to 60% for the lignite, and the water carried by the raw lignite is dried in the pulverization system, which will consume much energy. Therefore, high temperature should be maintained for the primary air of the lignite-fired power plants, especially when the power plant operates under low power ratio or with low temperature feed air. In this study, a 1000 MW lignite-fired power system integrated with a primary air heater is proposed and analyzed. In the primary air heater, the low temperature reheated steam is extracted from the boiler to heat the primary air after the air preheater. The integration of primary air heater makes the lignite-fired power system be more complex, which will influence the operational flexibility of the power plant. Therefore, dynamic models of steam turbines and the boiler with waste heat recovery system were developed in this study. The transient characteristics of the unit under load cycling conditions and primary frequency modulation processes were analyzed. Then, control strategy of the primary air heater of turbine and boiler were enhanced based on the simulation results. The results show that the temperature of primary air can be increased by 51-69 °C by the additional air preheater, and the primary frequency modulation capacity can be improved by 8 MW at 50% power load ratio during primary frequency modulation process. Copyright © 2024 by ASME.

关键词： Steam turbines

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Recent advances in nonmetallic atom-doped metal nanocrystals:Synthesis and catalytic applications

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Chinese Chemical Letters 2021年第9期32卷 2679-2692页

作者： Ruiyun Guo Ke Zhang Shangdong Ji Yangzi Zheng Mingshang Jin Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Metal nanocrystals have been recognized as the main catalytic materials in many fields,but insufficient activity and stability,as well as high prices,have limited their large-scale potential *** one of the extremely promising alternatives toward metal in boosting their catalytic performance,nonmetallic atoms-doped metal nanocrystals have recently received extensive attention because of their high efficiency,chemical and structural durability,abundant reserve,and low *** this review,we highlight the most recent progress in this field and provide insights into their catalytic *** metalnonmetal nanocrystals prepared by doping metal nanocrystals with nonmetallic atoms are introduced and classified based on the types of nonmetallic atoms,including metal hydrides,borides,carbides,nitrides,oxides,phosphides,and ***,their applications in catalysis,especially in electrocatalysis and organic catalysis,have been summarized and ***,the conclusions and perspectives are given for the catalysis-driven rational design of metal-nonmetal nanocrystals in this minireview.

关键词： Nonmetallic atom-doping Metal-nonmetal nanocrystals Organic catalysis Electrocatalysis Catalyst design

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Molecular Dynamics Simulation Investigation of the Solubility Parameter of Supercritical Carbon Dioxide-Cosolvent

Molecular Dynamics Simulation Investigation of the Solubilit...

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International Multidisciplinary Conference on Computer and Energy Science (SpliTech)

作者： Junying Wang Hui Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (数字)9789532901351

ISBN: (纸本)9798350390797

In this work, solubility parameters of the supercritical carbon dioxide (SC-CO2) system and the SC-CO2 adding cosolvent systems were calculated using molecular dynamics simulation. How temperature and pressure changes affected the solubility parameter were studied by molecular dynamics simulation. In addition, the mechanism of interaction between cosolvent and SC-CO2 was investigated. It was discovered that the SC-CO2 solubility parameter rose with rising pressure at constant temperature and fell with rising temperature at constant pressure. Additionally, it is obvious that increasing the solubility parameter of the SC-CO2 system as a whole can be achieved by adding a specific quantity of cosolvent. The solubility parameter of the SC-CO2-cosolvent system increased with increasing cosolvent content. The addition of cosolvent to improve the solubility parameter works by increasing the combined system's polar strength. The hydrogen bonding interaction energy has the greatest impact on the increase of solubility parameter.

关键词： Ethanol Hydrogen Carbon dioxide Bonding Carbon

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Dynamic simulation of a space gas-cooled reactor power system with a closed Brayton cycle

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Frontiers in Energy 2021年第4期15卷 916-929页

作者： Chenglong WANG Ran ZHANG Kailun GUO Dalin ZHANG Wenxi TIAN Suizheng QIU Guanghui SU Department of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power EngineeringShaanxi Key Laboratory of Advanced Nuclear Energy and TechnologyXi’an Jiaotong UniversityXi’an 710049China

Space nuclear reactor power(SNRP)using a gas-cooled reactor(GCR)and a closed Brayton cycle(CBC)is the ideal choice for future high-power space *** investigate the safety characteristics and develop the control strategies for gas-cooled SNRP,transient models for GCR,energy conversion unit,pipes,heat exchangers,pump and heat pipe radiator are established and a system analysis code is developed in this ***,analyses of several operation conditions are performed using this *** full-power steady-state operation,the core hot spot of 1293 K occurs near the upper part of the *** 0.4$reactivity is introduced into the core,the maximum temperature that the fuel can reach is 2059 K,which is 914 K lower than the fuel melting *** system finally has the ability to achieve a new steady-state with a higher reactor *** the GCR is shut down in an emergency,the residual heat of the reactor can be removed through the conduction of the core and radiation heat *** results indicate that the designed GCR is inherently safe owing to its negative reactivity feedback and passive decay heat *** paper may provide valuable references for safety design and analysis of the gas-cooled SNRP coupled with CBC.

关键词： gas-cooled space nuclear reactor power closed Brayton cycle system startup and shutdown positive reactivity insertion accident

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