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< Page ,Total 36 >
Experimental study on water collection performance of wire-to-plate electrostatic fog collector at various fog generation rates and fog flow velocities EI Scopus SCIE
期刊论文 | 2023 , 305 | Separation and Purification Technology
SCOPUS Cited Count: 1
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Abstract :

Electrostatic fog collectors can assist in alleviating water scarcity by recovering water from fog in natural or industrial environments. Therefore, a wire-to-plate electrostatic fog collector is proposed in this study. To achieve this, an electrostatic fog collector experimental test system is established. The effects of voltage, fog generation rate, and fog flow velocity on the current and collection performance of the electrostatic fog collector are investigated experimentally, and its performance coefficients are evaluated. The water collection rate is primarily determined by the rate of fog generation, the size distribution and evaporation of fog droplets, and the collection capacity of the electrostatic fog collector. The fog droplets limit the charge transfer within the electrostatic fog collector. The evaporation of the droplets tends to reduce the rate of water collection. The voltage and fog flow velocity affect the collection capacity. The higher collection capacity can be obtained by increasing the operating voltage, associated with an increased electric force on fog droplets, or by lowering the fog velocity for a longer residence time. The proposed electrostatic fog collector can meet the energy requirements for industrial applications. The experimental results demonstrated that the electrostatic fog collector achieves a maximum collection efficiency of 60 % when the voltage is 24 kV, and the fog flow velocity is 1.06 m/s. Furthermore, an advantage over reverse osmosis desalination is obtained under a more favorable operating range. At a voltage of 20 kV, a superior performance coefficient of 388.8 kg/kWh is obtained. The results suggested that the designed electrostatic fog collector can effectively recover water from the fog. © 2022 Elsevier B.V.

Keyword :

Corona discharge; Electrostatic; Fog collection; Ionic wind; Velocity; Water

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GB/T 7714 Zeng, M.J. , Qu, Z.G. , Zhang, J.F. . Experimental study on water collection performance of wire-to-plate electrostatic fog collector at various fog generation rates and fog flow velocities [J]. | Separation and Purification Technology , 2023 , 305 .
MLA Zeng, M.J. 等. "Experimental study on water collection performance of wire-to-plate electrostatic fog collector at various fog generation rates and fog flow velocities" . | Separation and Purification Technology 305 (2023) .
APA Zeng, M.J. , Qu, Z.G. , Zhang, J.F. . Experimental study on water collection performance of wire-to-plate electrostatic fog collector at various fog generation rates and fog flow velocities . | Separation and Purification Technology , 2023 , 305 .
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Negative corona discharge and flow characteristics of a two-stage needle-to-ring configuration ionic wind pump for temperature and relative humidity EI Scopus SCIE
期刊论文 | 2023 , 201 | International Journal of Heat and Mass Transfer
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Abstract :

Ionic wind pumps have the advantages of a compact structure, no moving parts, and low power consumption. The effects of temperature and humidity on the current–voltage and flow characteristics of ionic wind pumps are still unclear. This study experimentally investigates the effects of temperature and humidity on the breakdown voltage, discharge current, and velocity of a two-stage needle-to-ring type ionic wind pump with a negative corona discharge. It is found that the coupling effects of temperature, humidity, and water vapor condensation determine the current–voltage and flow characteristics of ionic wind pumps. The temperature and vapor condensation effects can enhance the discharge current and outlet velocity and weaken the breakdown voltage. However, the humidity effect can weaken the discharge current and outlet velocity, and improve the breakdown voltage. Moreover, there exists a competition between humidity and vapor condensation effects on breakdown voltage, current, and velocity. The increase in temperature intensifies the humidity effect and weakens the condensation effect; thus, the temperature changes the contribution of humidity and condensation effects in the competition. A working spectrum of ionic wind is provided in the temperature and humidity coupling environment, including a vapor condensation-controlled zone, a sensitive humidity zone for breakdown voltage and velocity, and an insensitive humidity zone for breakdown voltage and velocity. The spectrum can provide theoretical guidance for designing ionic wind pumps at different temperatures and humidity. © 2022 Elsevier Ltd

Keyword :

Corona discharge; Current–voltage; Humidity; Ionic wind; Temperature; Velocity

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GB/T 7714 Zeng, M.J. , Qu, Z.G. , Zhang, J.F. . Negative corona discharge and flow characteristics of a two-stage needle-to-ring configuration ionic wind pump for temperature and relative humidity [J]. | International Journal of Heat and Mass Transfer , 2023 , 201 .
MLA Zeng, M.J. 等. "Negative corona discharge and flow characteristics of a two-stage needle-to-ring configuration ionic wind pump for temperature and relative humidity" . | International Journal of Heat and Mass Transfer 201 (2023) .
APA Zeng, M.J. , Qu, Z.G. , Zhang, J.F. . Negative corona discharge and flow characteristics of a two-stage needle-to-ring configuration ionic wind pump for temperature and relative humidity . | International Journal of Heat and Mass Transfer , 2023 , 201 .
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Structure Design for Ultrahigh Power Density Proton Exchange Membrane Fuel Cell SCIE Scopus
期刊论文 | 2023 | SMALL METHODS
SCOPUS Cited Count: 32
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Abstract :

Next-generation ultrahigh power density proton exchange membrane fuel cells rely not only on high-performance membrane electrode assembly (MEA) but also on an optimal cell structure. To this end, this work comprehensively investigates the cell performance under various structures, and it is revealed that there is unexploited performance improvement in structure design because its positive effect enhancing gas supply is often inhibited by worse proton/electron conduction. Utilizing fine channel/rib or the porous flow field is feasible to eliminate the gas diffusion layer (GDL) and hence increase the power density significantly due to the decrease of cell thickness and gas/electron transfer resistances. The cell structure combining fine channel/rib, GDL elimination and double-cell structure is believed to increase the power density from 4.4 to 6.52 kW L-1 with the existing MEA, showing nearly equal importance with the new MEA development in achieving the target of 9.0 kW L-1.

Keyword :

double-cell structures integrated BP-GDL structures porous flow fields power density proton exchange membrane fuel cells

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GB/T 7714 Zhang, Guobin , Wu, Lizhen , Tongsh, Chasen et al. Structure Design for Ultrahigh Power Density Proton Exchange Membrane Fuel Cell [J]. | SMALL METHODS , 2023 .
MLA Zhang, Guobin et al. "Structure Design for Ultrahigh Power Density Proton Exchange Membrane Fuel Cell" . | SMALL METHODS (2023) .
APA Zhang, Guobin , Wu, Lizhen , Tongsh, Chasen , Qu, Zhiguo , Wu, Siyuan , Xie, Biao et al. Structure Design for Ultrahigh Power Density Proton Exchange Membrane Fuel Cell . | SMALL METHODS , 2023 .
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Review of Shale Gas Transport Prediction: Basic Theory, Numerical Simulation, Application of AI Methods, and Perspectives SCIE Scopus
期刊论文 | 2023 | ENERGY & FUELS
SCOPUS Cited Count: 10
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Abstract :

The gas transport mechanism in shale reservoirs is extremely complex and is a typical multiscale and multiphysics coupled transport process, considering the complex shale rock structure, wide distribution of micropores and nanopores in shale gas reservoirs, diverse gas occurrence forms, and large pore size spans. An accurate understanding of the shale gas transport process and mechanism is important for effective exploration of shale gas reservoirs. In this work, a review of the recent progress in the prediction of shale gas transport in porous media is presented. The basic theory of gas transport in nanopores is discussed. The gas transport in organic and inorganic matter and the gas adsorption effect are covered. Then, gas transport simulations with conventional multiscale numerical methods, including molecular dynamics and lattice Boltzmann simulations, are reviewed, and the multiscale modeling methods are discussed. Furthermore, the application of artificial intelligence (AI) methods in shale gas transport research is discussed. The focus is on the characterization of the shale porous geometry, including porosity, tortuosity, pore size distribution, and reconstruction of the shale porous medium. The application of AI-based methods such as neural networks and machine learning for the prediction of porous flow properties is discussed. This study intends to provide a comprehensive review of shale gas transport characteristics and to enable the accessibility of AI tools in the research of shale gas.

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GB/T 7714 Jiang, Zhiyuan , Wang, Wenkai , Zhu, Huangyi et al. Review of Shale Gas Transport Prediction: Basic Theory, Numerical Simulation, Application of AI Methods, and Perspectives [J]. | ENERGY & FUELS , 2023 .
MLA Jiang, Zhiyuan et al. "Review of Shale Gas Transport Prediction: Basic Theory, Numerical Simulation, Application of AI Methods, and Perspectives" . | ENERGY & FUELS (2023) .
APA Jiang, Zhiyuan , Wang, Wenkai , Zhu, Huangyi , Yin, Ying , Qu, Zhiguo . Review of Shale Gas Transport Prediction: Basic Theory, Numerical Simulation, Application of AI Methods, and Perspectives . | ENERGY & FUELS , 2023 .
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Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels SCIE
期刊论文 | 2022 , 14 (33) , 37608-37619 | ACS APPLIED MATERIALS & INTERFACES
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Abstract :

migration in selective nanochannels, dominated by interfacial effects, temperature, and concentration. Current efforts emphasize membrane modification for superior reliability and durability, whereas the origin and implication of interfacial effects are unclear. This work performs ab initio molecular dynamics simulations for hydrated ion-graphene oxide interfaces by regulating the temperature and concentration. The interfacial effects associated with their induced anisotropic ion diffusion and ion selectivity are revealed. The scientific essence of the interfacial effects is an electron transfer triggered by hydrated ion-functional group interactions. The interfacial effects are clarified to include dynamic solvation structures, interfacial H-bonds, and chemical reactions. Ions possess incomplete hydration shells, and their arrangements vary from ordered to disordered to overlapped. Interfacial H-bonds restrict hydrated ions by constraining water molecules, whereas continuous reactions provide lateral pathways to generate anisotropy. Cation selectivity is further clarified by negative surface charges from hydroxyl deprotonation. Besides, temperature rise induces disordered hydrated ions as well as frequent and violent reactions, enhancing ion diffusion, selectivity, and anisotropy; excessive concentrations produce overlapped hydrated ions, more H-bonds, and inferior reactions, weakening ion diffusion, selectivity, and anisotropy. Finally, the bottom-up concept for osmotic energy conversion is summarized, and elevated temperature combined with low concentration is found to boost ion diffusion and ion selectivity synergistically. This work provides an in-depth understanding of interfacial phenomena and ion behaviors in nanochannels.

Keyword :

anisotropic ion diffusion interfacial effect ion selectivity nanochannel osmotic energy conversion

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GB/T 7714 Wang, Qiang , Qu, Zhiguo , Zhang, Xu et al. Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (33) : 37608-37619 .
MLA Wang, Qiang et al. "Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels" . | ACS APPLIED MATERIALS & INTERFACES 14 . 33 (2022) : 37608-37619 .
APA Wang, Qiang , Qu, Zhiguo , Zhang, Xu , Chen, Liang . Electronic-Level Insight into Interfacial Effects and Their Induced Anisotropic Ion Diffusion and Ion Selectivity in Nanochannels . | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (33) , 37608-37619 .
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Collective Enhancements on Thermal-Electrical and Mechanical Properties of Graphite-Based Composite Bipolar Plates through the Coupled Manipulations of Molding and Impregnation Pressures SCIE Scopus
期刊论文 | 2022 , 12 (2) | MEMBRANES
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Abstract :

The performance and durability of proton exchange fuel cells (PEMFCs) are greatly affected by the bipolar plate (BP). In this paper, the thermal and electrical conductivities and mechanical property of graphite filled with resin composite BPs were collectively enhanced through the effectively coupled manipulations of molding pressure and impregnation pressure. The microstructures show that the resin tends to distribute at the top region of the rib under high impregnation pressure. The thermal and electrical conductivities of the pure expanded graphite BP is well reserved in the composite BPs under high molding pressure, which can facilitate the heat transfer and electron conduction in the PEMFCs. The relative density and compressive strength of composite BPs were greatly enhanced by the impregnation of resin compared to the expanded graphite under high molding pressure without the impregnation of resin (HU-BP). The maximum thermal conductivity, compressive strength, and minimum interfacial contact resistance (ICR) are collectively achieved in the HL-BP. The enhanced thermal-electrical and mechanical properties could be mainly attributed to the well-reserved continuous networks of graphite in the composite BPs. The findings in this paper are expected to synergetically improve the thermal, electrical, and mechanical properties of composite BPs through coupled manipulations of the molding and impregnation pressures, which in turn enhances the power density and durability of PEMFCs.

Keyword :

bipolar plates graphite-based composite impregnation pressure interfacial contact resistance mechanical property molding pressure thermal conductivity

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GB/T 7714 Wang, Xueliang , Qu, Zhiguo , Yang, Haitao et al. Collective Enhancements on Thermal-Electrical and Mechanical Properties of Graphite-Based Composite Bipolar Plates through the Coupled Manipulations of Molding and Impregnation Pressures [J]. | MEMBRANES , 2022 , 12 (2) .
MLA Wang, Xueliang et al. "Collective Enhancements on Thermal-Electrical and Mechanical Properties of Graphite-Based Composite Bipolar Plates through the Coupled Manipulations of Molding and Impregnation Pressures" . | MEMBRANES 12 . 2 (2022) .
APA Wang, Xueliang , Qu, Zhiguo , Yang, Haitao , Zhang, Guobin , Zhang, Yichong , Liu, Chaofan . Collective Enhancements on Thermal-Electrical and Mechanical Properties of Graphite-Based Composite Bipolar Plates through the Coupled Manipulations of Molding and Impregnation Pressures . | MEMBRANES , 2022 , 12 (2) .
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A prediction model for nanoparticle diffusion behavior in fibrous materials considering steric and hydrodynamic resistances SCIE Scopus
期刊论文 | 2022 , 24 (39) , 24394-24403 | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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Precise prediction of the hindered diffusion behavior of electroneutral particles in fibrous media plays a critical role in the development of drugs, polymer membranes, and porous electrodes. However, the random microstructure and unknown coupling relationship of multiple resistance mechanisms lead to the lack of a universal prediction model. In this work, a dual-resistance model is proposed by reconstructed pore-scale simulations, which presents the coexistence of steric and hydrodynamic resistances in the multiplication form. The simulation results show that the relationship between steric resistance and structural parameters (porosity, fiber radius, and particle radius) is exponential, while that for hydrodynamic resistance is polynomial. The dominant diffusion resistance is found to change from hydrodynamic to steric resistance with a decrease in porosity. The fluorescent polystyrene microsphere diffusivity in a series of SiO2 fibrous media is determined by single-particle tracking experiments, quantitatively confirming the dual-resistance model. The present model can be used for rapid diffusivity prediction and fibrous membrane and drug design.

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GB/T 7714 Tian, Di , Qu, Zhiguo , Lai, Tao et al. A prediction model for nanoparticle diffusion behavior in fibrous materials considering steric and hydrodynamic resistances [J]. | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2022 , 24 (39) : 24394-24403 .
MLA Tian, Di et al. "A prediction model for nanoparticle diffusion behavior in fibrous materials considering steric and hydrodynamic resistances" . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS 24 . 39 (2022) : 24394-24403 .
APA Tian, Di , Qu, Zhiguo , Lai, Tao , Zhu, Guodong . A prediction model for nanoparticle diffusion behavior in fibrous materials considering steric and hydrodynamic resistances . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2022 , 24 (39) , 24394-24403 .
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Thermal-enhanced nanofluidic osmotic energy conversion with the interfacial photothermal method EI SCIE Scopus
期刊论文 | 2022 , 326 | APPLIED ENERGY
SCOPUS Cited Count: 1
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Abstract :

Nanofluidic osmotic energy conversion is widely considered a promising technology that converts sustainable salinity-gradient energy. Current studies on temperature regulation require extra electrical consumption to raise the solution temperature, causing the deterioration of the net power generation. In this study, a thermal-enhanced nanofluidic osmotic energy conversion with photothermal conversion structure (PCS-TOEC) integrated device is proposed to utilize sustainable solar energy as the heat source. This device is a reformation by adding photothermal conversion structure (PCS) into a salinity gradient utilization component. PCS is composed of a high solar-absorption cupric oxide film and a high thermal-conductive silicon carbide porous foam, and it can efficiently convert solar energy into solution heat. In addition, PCS can promote bulk heating at a high rate. The experiment shows that the solution temperature is raised from 25 degrees C to 68 degrees C after 240 min under one sun illumination, and the output power density achieves 8.6 W/m(2) with 0.5 M/0.01 M NaCl solution, exhibiting a 188 % increase compared to that at room temperature. The increased bulk solution temperature under the photothermal effect can improve the ion diffusion coefficient and electrolyte convection, as well as reduce the electrolyte viscosity, resulting in the enhancement of the associated ion flux. The underlying mechanism of thermally enhanced osmotic power is primarily attributed to the elevated ion flux at increased bulk solution temperatures. Finally, the environmental adaptability of this device is verified over a wide range of concentration gradients (from 10-fold to 100-fold) and pH (from 4 to 10) conditions. In this work, a sustainable solution that enhances osmotic power generation is provided, and a novel method that achieves hybrid renewable energy cooperative utilization is developed.

Keyword :

Nanochannel Osmotic energy conversion Photothermal conversion Porous media

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GB/T 7714 Zhang, X. F. , Zhang, X. , Qu, Z. G. et al. Thermal-enhanced nanofluidic osmotic energy conversion with the interfacial photothermal method [J]. | APPLIED ENERGY , 2022 , 326 .
MLA Zhang, X. F. et al. "Thermal-enhanced nanofluidic osmotic energy conversion with the interfacial photothermal method" . | APPLIED ENERGY 326 (2022) .
APA Zhang, X. F. , Zhang, X. , Qu, Z. G. , Pu, J. Q. , Wang, Q. . Thermal-enhanced nanofluidic osmotic energy conversion with the interfacial photothermal method . | APPLIED ENERGY , 2022 , 326 .
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Passive Ultra-Conductive Thermal Metamaterials EI SCIE Scopus
期刊论文 | 2022 , 34 (17) | ADVANCED MATERIALS
SCOPUS Cited Count: 10
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Ultra-conductive heat transport showcases significant potentials in popular thermal managements with convection, phase change, and heat source. However, it is captivated impossible for passive thermal manipulation, usually bounded by intrinsic thermal conductivities of natural materials, to outperform these active recipes in need of extra energy payload. Here, a robust recipe to create passive ultra-conductive thermal metamaterials consisting of nothing but bulk natural materials is reported. Thanks to the local thermal resistance regulation by vertical thermal transport channel, the proof-of-concept thermal metamaterials experimentally demonstrate extreme effective conductivity (1915 W m(-1) K-1) solely with naturally occurring materials. The purely conductive modulation without any external energy is comparable to active counterparts, and further reveals its robustness and unexpected convenience. The findings construct a high-efficient paradigm of passive thermal management with ultra-conductive heat transport, and further hint potentials in other Laplace fields, e.g., DC and magnetostatics.

Keyword :

interfacial effect pure conduction thermal metamaterials ultra-conductivity

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GB/T 7714 Guo, Jun , Xu, Guoqiang , Tian, Di et al. Passive Ultra-Conductive Thermal Metamaterials [J]. | ADVANCED MATERIALS , 2022 , 34 (17) .
MLA Guo, Jun et al. "Passive Ultra-Conductive Thermal Metamaterials" . | ADVANCED MATERIALS 34 . 17 (2022) .
APA Guo, Jun , Xu, Guoqiang , Tian, Di , Qu, Zhiguo , Qiu, Cheng-Wei . Passive Ultra-Conductive Thermal Metamaterials . | ADVANCED MATERIALS , 2022 , 34 (17) .
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Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges SCIE Scopus
期刊论文 | 2022 | CHEMICAL REVIEWS
SCOPUS Cited Count: 20
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Porous flow fields distribute fuel and oxygen for the electrochemical reactions of proton exchange membrane (PEM) fuel cells through their pore network instead of conventional flow channels. This type of flow fields has showed great promises in enhancing reactant supply, heat removal, and electrical conduction, reducing the concentration performance loss and improving operational stability for fuel cells. This review presents the research and development progress of porous flow fields with insights for next-generation PEM fuel cells of high power density (e.g., similar to 9.0 kW L-1). Materials, fabrication methods, fundamentals, and fuel cell performance associated with porous flow fields are discussed in depth. Major challenges are described and explained, along with several future directions, including separated gas/liquid flow configurations, integrated porous structure, full morphology modeling, data-driven methods, and artificial intelligence-assisted design/ optimization.

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GB/T 7714 Zhang, Guobin , Qu, Zhiguo , Tao, Wen-Quan et al. Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges [J]. | CHEMICAL REVIEWS , 2022 .
MLA Zhang, Guobin et al. "Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges" . | CHEMICAL REVIEWS (2022) .
APA Zhang, Guobin , Qu, Zhiguo , Tao, Wen-Quan , Wang, Xueliang , Wu, Lizhen , Wu, Siyuan et al. Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges . | CHEMICAL REVIEWS , 2022 .
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