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Experimental and numerical investigation on flow characteristics of large cross-sectional ionic wind pump with multiple needles-to-mesh electrode EI Scopus
期刊论文 | 2019 , 141 (3) | Journal of Fluids Engineering, Transactions of the ASME
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Abstract :

Ionic wind pumps have attracted considerable interest because of their low energy consumption, compact structures, flexible designs, and lack of moving parts. However, large cross-sectional ionic wind pumps have yet to be numerically analyzed and experimentally optimized. Accordingly, this study develops a large cross-sectional ionic wind pump with multiple needles-to-mesh electrode, as well as analyzes its flow characteristics using a proposed full three-dimensional simulation method validated with experimental data. To obtain a considerably high outlet average velocity, experimental studies and numerical methods are employed to optimize the pump's configuration parameters, including needle electrode configuration, needle diameter, grid size, and gap between electrodes. The breakdown voltage and highest velocity corresponding to the breakdown voltage increase with an increase in the needle tip-to-mesh gap. After parametric optimization, a maximum velocity of 2.55 m/s and a flow rate of 2868 L/min are achieved. Copyright © 2019 by ASME.

Keyword :

Configuration parameters Flow charac-teristics Full three-dimensional Ionic wind Low energy consumption Numerical investigations Parametric optimization Volumetric flow rate

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GB/T 7714 Zhang, J.F. , Wang, S. , Zeng, M.J. et al. Experimental and numerical investigation on flow characteristics of large cross-sectional ionic wind pump with multiple needles-to-mesh electrode [J]. | Journal of Fluids Engineering, Transactions of the ASME , 2019 , 141 (3) .
MLA Zhang, J.F. et al. "Experimental and numerical investigation on flow characteristics of large cross-sectional ionic wind pump with multiple needles-to-mesh electrode" . | Journal of Fluids Engineering, Transactions of the ASME 141 . 3 (2019) .
APA Zhang, J.F. , Wang, S. , Zeng, M.J. , Qu, Z.G. . Experimental and numerical investigation on flow characteristics of large cross-sectional ionic wind pump with multiple needles-to-mesh electrode . | Journal of Fluids Engineering, Transactions of the ASME , 2019 , 141 (3) .
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Effect of various strategies of soc-dependent operating current on performance of a vanadium redox flow battery EI SCIE Scopus
期刊论文 | 2018 , 259 , 772-782 | ELECTROCHIMICA ACTA
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Abstract :

A two-dimensional quasi-steady-state model is applied to investigate charge/discharge behavior and performance of a VRFB. Emphasis is focused on exploring the influences of various strategies of socdependent operating current density on battery performance. For constant-current operation, with the increase of current density, although the system mean power density is significantly boosted, the system capacity and net discharge energy in a cycle are obviously decreased. It is quite difficult to give consideration to both the system capacity and system power simultaneously such that overall battery performance can be improved. Applying the strategy of soc-dependent operating current (i.e., low current at the end of charge/discharge process while high current for the rest time), the system capacity, power density and net discharge energy in a cycle can be simultaneously boosted while comparable efficiencies can be achieved. Optimally, at the mean operating current density of about 70 mA cm(-2), the system capacity is maximally improved by 9.3% and the net discharge energy is maximally increased by 7.9% as compared with that under constant-current operation. As the same time, the energy-based system efficiency can be maintained over 78%, which is comparable with that for constant-current operation. (c) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Mathematical modeling Vanadium redox flow battery Soc-dependent operating current Overall performance

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GB/T 7714 Yang, W. W. , Yan, F. Y. , Qu, Z. G. et al. Effect of various strategies of soc-dependent operating current on performance of a vanadium redox flow battery [J]. | ELECTROCHIMICA ACTA , 2018 , 259 : 772-782 .
MLA Yang, W. W. et al. "Effect of various strategies of soc-dependent operating current on performance of a vanadium redox flow battery" . | ELECTROCHIMICA ACTA 259 (2018) : 772-782 .
APA Yang, W. W. , Yan, F. Y. , Qu, Z. G. , He, Y. L. . Effect of various strategies of soc-dependent operating current on performance of a vanadium redox flow battery . | ELECTROCHIMICA ACTA , 2018 , 259 , 772-782 .
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Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode EI SCIE Scopus
期刊论文 | 2018 , 213 , 293-305 | APPLIED ENERGY
WoS CC Cited Count: 6
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Abstract :

Optimal electrode compression can efficiently reduce electrode contact resistance and enhance species mass transfer so that the performance of vanadium redox flow battery (VRFB) is consequently improved. New designs of VRFB with a serpentine flow field on the current collector and compressed thin electrodes are investigated to increase its power density. In this study, the intrusion ratio, porosity, strain stress, area specific resistance, hydrodynamic characteristics, and charge/discharge performance of VRFBs are comprehensively characterized under different compression ratios (CRs) which can be adjusted by changing the assembly force. Then, VRFBs using carbon felts with different CRs are tested by experiments, and the influence of electrode compression on VRFB cell performance is quantitatively evaluated. The in-homogeneous compression of carbon felt electrode in a VRFB with a flow field leads to a non-uniform porosity distribution of the electrodes under the channel, intrusion, and rib regions. The intrusion ratio, local average porosity, and permeability at different CRs are obtained. The Kozney Carman constant of carbon fiber felt is modified by measuring the flow pressure drop through the electrode. The charge/discharge curves are acquired and the corresponding energy efficiencies are calculated under different CRs. It is shown that the charge/discharge time increases with the CR, and the energy efficiency can be improved to a maximum of 19.4% when the CR varies from 0.3% to 41.8%.

Keyword :

Vanadium redox flow battery Compression ratios Cell performance In-homogeneous compression

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GB/T 7714 Wang, Q. , Qu, Z. G. , Jiang, Z. Y. et al. Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode [J]. | APPLIED ENERGY , 2018 , 213 : 293-305 .
MLA Wang, Q. et al. "Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode" . | APPLIED ENERGY 213 (2018) : 293-305 .
APA Wang, Q. , Qu, Z. G. , Jiang, Z. Y. , Yang, W. W. . Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode . | APPLIED ENERGY , 2018 , 213 , 293-305 .
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Approach for predicting effective thermal conductivity of aerogel materials through a modified lattice Boltzmann method EI SCIE Scopus
期刊论文 | 2018 , 132 , 730-739 | APPLIED THERMAL ENGINEERING
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Abstract :

A modified lattice Boltzmann method (LBM) is established to predict effective thermal conductivity of aerogel materials for insulation performance. A stochastic generation method based on mesoscopic solid-phase growth principle is adopted to reconstruct and mimic aerogel porous structure. The modified LBM scheme introduces an additional coefficient to regulate significant differences in inherent thermal conductivity between solid and gas phases, and a converged solution is guaranteed. The modified model is validated with experimental data, and it offers improved prediction accuracy than conventional theoretical models. Investigations are performed to determine the effects of density, ambient pressure, and characteristic temperature on effective thermal conductivity. When temperature is lower than 500 K, an optimal density of 110 kg/m(3) minimizes effective thermal conductivity. When temperature is higher than 500 K, the effective thermal conductivity decreases monotonously with increasing density. At fixed temperature, the variation in effective thermal conductivity can be divided into three typical stages based on pressure. Separate contributions of gas-phase conduction, solid-phase conduction, and radiative heat transfer are discussed and analyzed. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Lattice Boltzmann method Aerogel materials Stochastic generation method Effective thermal conductivity

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GB/T 7714 Qu, Z. G. , Fu, Y. D. , Liu, Y. et al. Approach for predicting effective thermal conductivity of aerogel materials through a modified lattice Boltzmann method [J]. | APPLIED THERMAL ENGINEERING , 2018 , 132 : 730-739 .
MLA Qu, Z. G. et al. "Approach for predicting effective thermal conductivity of aerogel materials through a modified lattice Boltzmann method" . | APPLIED THERMAL ENGINEERING 132 (2018) : 730-739 .
APA Qu, Z. G. , Fu, Y. D. , Liu, Y. , Zhou, L. . Approach for predicting effective thermal conductivity of aerogel materials through a modified lattice Boltzmann method . | APPLIED THERMAL ENGINEERING , 2018 , 132 , 730-739 .
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Lattice Boltzmann simulation of ion and electron transport during the discharge process in a randomly reconstructed porous electrode of a lithium-ion battery EI SCIE Scopus
期刊论文 | 2018 , 123 , 500-513 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Rechargeable lithium-ion batteries (LIBs) have improved significantly over the past 20 years; however, the micro-scale working mechanism of these batteries, especially the influence of electrode microstructures on battery performance, still requires further study. The relationship between the electrode microstructure and battery performance is studied in detail by developing a two-dimensional (2D) lattice Boltzmann model to reveal the ion and electron transport within an LIB porous electrode. The present model is established by using randomly reconstructed electrode geometry and the coupling of the electrochemical reaction and ion and electron transport under complex boundary conditions. The influences of the micro-scale morphological features of the battery electrode on the local lithium concentration distribution, electric potential and macroscopic discharge performance are revealed. The randomness of the particle distribution and particle shape result in a heterogeneous distribution of the lithium concentration and electrode potential. In electrode particles, lithium exchanges are enhanced for small particles and improved at the edges and corners for large irregular particles. Regions with low lithium concentration produce a high electric potential. A large particle size and low porosity in an anode improve battery performance. Likewise, a small particle size and high porosity in a cathode also improve battery performance. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Electrode microstructure Lithium-ion battery Lattice Boltzmann method Discharge process

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GB/T 7714 Jiang, Z. Y. , Qu, Z. G. , Zhou, L. . Lattice Boltzmann simulation of ion and electron transport during the discharge process in a randomly reconstructed porous electrode of a lithium-ion battery [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 123 : 500-513 .
MLA Jiang, Z. Y. et al. "Lattice Boltzmann simulation of ion and electron transport during the discharge process in a randomly reconstructed porous electrode of a lithium-ion battery" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 123 (2018) : 500-513 .
APA Jiang, Z. Y. , Qu, Z. G. , Zhou, L. . Lattice Boltzmann simulation of ion and electron transport during the discharge process in a randomly reconstructed porous electrode of a lithium-ion battery . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 123 , 500-513 .
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Numerical study on the operating characteristics of cryogenic loop heat pipes based on a one-dimensional heat leak model EI SCIE Scopus
期刊论文 | 2018 , 172 , 485-496 | ENERGY CONVERSION AND MANAGEMENT
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Abstract :

The cryogenic loop heat pipe is an effective and reliable heat transfer system in the space technology. A global model of cryogenic loop heat pipe is developed by full consideration of the subcooled effect and the mass flow rate variation of the working fluid along the evaporator core. The heat leak is calculated on the basis of onedimensional temperature distributions in the evaporator core. The calculation of the proposed model improves the prediction accuracy relative to traditional zero-dimensional models. The effects of filling pressure, parasitic heat load, auxiliary heat load, and use of bayonet on the CLHP performance are investigated. A normal "U shape" of the evaporating temperature curve appears at a low filling pressure (1.45 MPa). At moderate and high filling pressures (1.465 MPa and 1.5 MPa, respectively), two new evaporating temperature curves with "flat bottom U-shape" and "L-shape", which shows the unique operating characteristics of cryogenic loop heat pipes, are found, The two new profiles are attributed to the coupling of mass and energy between gas reservoir and primary compensation chamber. The determinant factor for the minimum working heat load is the void fraction of the primary compensation chamber. By contrast, the maximum working heat load is determined by the void fraction at a low filling pressure (below 1.4 MPa) and the maximum capillary pressure at a high filling pressure (above 1.4 MPa). The use of a bayonet can decrease the maximum vapor quality in the evaporator core and effectively avoid burnout.

Keyword :

Cryogenic loop heat pipe Heat leak Bayonet Operating characteristics

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GB/T 7714 Qu, Z. G. , Chen, G. , Zhou, L. et al. Numerical study on the operating characteristics of cryogenic loop heat pipes based on a one-dimensional heat leak model [J]. | ENERGY CONVERSION AND MANAGEMENT , 2018 , 172 : 485-496 .
MLA Qu, Z. G. et al. "Numerical study on the operating characteristics of cryogenic loop heat pipes based on a one-dimensional heat leak model" . | ENERGY CONVERSION AND MANAGEMENT 172 (2018) : 485-496 .
APA Qu, Z. G. , Chen, G. , Zhou, L. , Miao, J. Y. . Numerical study on the operating characteristics of cryogenic loop heat pipes based on a one-dimensional heat leak model . | ENERGY CONVERSION AND MANAGEMENT , 2018 , 172 , 485-496 .
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Numerical study on vanadium redox flow battery performance with non-uniformly compressed electrode and serpentine flow field EI SCIE Scopus
期刊论文 | 2018 , 220 , 106-116 | APPLIED ENERGY
WoS CC Cited Count: 2
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Abstract :

Electrode compression is an effective approach to enhance the performance of vanadium redox flow battery (VRFB). Electrode compression can decrease the contact resistance between the electrode and the current collector. Porous electrode compression and deformation are not uniform because of the rib-channel patterns and part of the fibers pressed into the channel. The effects of the non-uniform deformation of a compressed electrode on the performance of a VRFB with flow field are not fully analyzed. In this study, a non-uniform model is proposed to consider the electrode shape deformation and non-uniformity of physical properties inside a compressed electrode. Morphological features of a deformed electrode including the intrusion ratio and local porosities under compression are investigated. Non-uniformly compressed electrodes with different local porosity and permeability are obtained. The predicted cell performance is initially validated using experiment data. The performance of VRFB with non-uniformly compressed electrode and serpentine flow field are investigated under different compression ratios (CRs). The non-uniform model can reasonably predict the charge/discharge and flow behavior. The velocity profile, local current density, and overpotential fluctuation along the rib and channel regions are obtained. The bulk velocity associated with species transport is improved because of the decreased cross-section areas of the flow channel inside the compressed electrode. An appropriate compression can improve the VRFB performance because of the enhanced species transport and increased reaction area when the intrusion part is considered. An optimized electrode CR of 55.7% is found to exhibit the maximum concentration uniformity as well as the minimum current density and overpotential. The present model can guide the VRFB design when the compressed electrode is considered.

Keyword :

Vanadium redox flow battery Geometry deformation Non-uniform model Non-uniformly compressed electrode Intrusion ratio

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GB/T 7714 Wang, Q. , Qu, Z. G. , Jiang, Z. Y. et al. Numerical study on vanadium redox flow battery performance with non-uniformly compressed electrode and serpentine flow field [J]. | APPLIED ENERGY , 2018 , 220 : 106-116 .
MLA Wang, Q. et al. "Numerical study on vanadium redox flow battery performance with non-uniformly compressed electrode and serpentine flow field" . | APPLIED ENERGY 220 (2018) : 106-116 .
APA Wang, Q. , Qu, Z. G. , Jiang, Z. Y. , Yang, W. W. . Numerical study on vanadium redox flow battery performance with non-uniformly compressed electrode and serpentine flow field . | APPLIED ENERGY , 2018 , 220 , 106-116 .
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Coupled GCMC and LBM simulation method for visualizations of CO2/CH4 gas separation through Cu-BTC membranes EI SCIE Scopus
期刊论文 | 2018 , 550 , 448-461 | JOURNAL OF MEMBRANE SCIENCE
WoS CC Cited Count: 1
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Abstract :

A fully dynamic model for mixture gas separation is built in Cu-BTC membranes. A multi-scale method that couples the lattice Boltzmann method with grand canonical Monte Carlo (GCMC) is proposed to investigate the mass transfer process of CO2/CH4 mixture gases in Cu-BTC membranes. The convection and diffusion in the interparticle flow field and the intraparticle diffusion and adsorption in the particle interior are simultaneously considered. The membrane morphology is reconstructed by a sphere-based simulated annealing method. The effects of membrane porosity and particle size on the mass transfer and selectivity of CO2/CH4 mixture gases are predicted. Results show that the selectivity of CO2/CH4 is mainly determined by interparticle and intraparticle mass transfer resistances. Meanwhile, the time of saturation adsorption for CO2 and CH4 both decrease with an increase in porosity but decreases for CO2 and increases for CH4 with an increase in particle size. The selectivity of CO2/CH4 in Cu-BTC membranes decreases with an increase in porosity and particle size. Therefore, membranes with small porosity and particle size should be utilized. Compared with the traditional binary GCMC and ISAT methods based on saturation adsorption, the proposed coupled method is closer to the physical essence of the process because it considers dynamic competitive adsorption. The present method can be helpful in the design of efficient metal-organic framework (MOF) membranes.

Keyword :

MOF membranes GCMC Adsorption Lattice Membrane selectivity Boltzmann method

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GB/T 7714 Wang, H. , Qu, Z. G. , Zhou, L. . Coupled GCMC and LBM simulation method for visualizations of CO2/CH4 gas separation through Cu-BTC membranes [J]. | JOURNAL OF MEMBRANE SCIENCE , 2018 , 550 : 448-461 .
MLA Wang, H. et al. "Coupled GCMC and LBM simulation method for visualizations of CO2/CH4 gas separation through Cu-BTC membranes" . | JOURNAL OF MEMBRANE SCIENCE 550 (2018) : 448-461 .
APA Wang, H. , Qu, Z. G. , Zhou, L. . Coupled GCMC and LBM simulation method for visualizations of CO2/CH4 gas separation through Cu-BTC membranes . | JOURNAL OF MEMBRANE SCIENCE , 2018 , 550 , 448-461 .
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Methane Combustion with Cobalt-Substituted Barium-Lanthanum Hexaaluminate Catalysts Supported on Porous Monolithic Honeycombs EI SCIE Scopus
期刊论文 | 2018 , 144 (3) | JOURNAL OF ENERGY ENGINEERING
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Methane combustion with porous honeycomb hexaaluminate catalysts is studied under high temperatures. Cobalt-substituted barium-lanthanum hexaaluminates (Ba1-mLamCoAl11O19 +/-delta) are prepared by co-precipitation procedures and directly deposited onto 300-cpsi porous monolithic honeycomb supports. Catalyst characterizations are performed by scanning electron microscope, X-ray diffraction, and Brunauer-Emmett-Teller method. Effects of La substitution ratio, catalyst content and length, and air preheating temperature on catalytic combustion performances are evaluated. Increasing La substitution ratio can significantly enhance catalyst activity, thermal stability, specific surface area, and combustion performance. The monolithic honeycomb catalyst with largest specific surface area and optimal combustion performance has an optimal catalyst content of 6.0% by weight. The long honeycomb catalyst can improve flame stability limits and reduce pollutant emissions. Increasing air preheating temperature can reduce HC and CO emissions, whereas NOx formation can be improved as the air preheating temperature higher than 250 degrees C. (C) 2018 American Society of Civil Engineers.

Keyword :

Hexaaluminate catalyst Porous honeycomb Combustion performance Methane

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GB/T 7714 Feng, X. B. , Qu, Z. G. . Methane Combustion with Cobalt-Substituted Barium-Lanthanum Hexaaluminate Catalysts Supported on Porous Monolithic Honeycombs [J]. | JOURNAL OF ENERGY ENGINEERING , 2018 , 144 (3) .
MLA Feng, X. B. et al. "Methane Combustion with Cobalt-Substituted Barium-Lanthanum Hexaaluminate Catalysts Supported on Porous Monolithic Honeycombs" . | JOURNAL OF ENERGY ENGINEERING 144 . 3 (2018) .
APA Feng, X. B. , Qu, Z. G. . Methane Combustion with Cobalt-Substituted Barium-Lanthanum Hexaaluminate Catalysts Supported on Porous Monolithic Honeycombs . | JOURNAL OF ENERGY ENGINEERING , 2018 , 144 (3) .
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Parametric Study and Optimization of Flow Characteristics of Wire-Nonparallel Plate-Type Electrostatic Air Accelerators EI SCIE PubMed Scopus
期刊论文 | 2018 , 140 (10) | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
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Wire and nonparallel plate electrode-type electrostatic air accelerators have attracted significant interest. The physical process involved in using accelerators is complicated. Moreover, mechanisms are unclear, especially for accelerators with double-and multiwire electrodes. In this study, the two-dimensional (2D) model of a wire-nonparallel plate-type accelerator validated by experiments is established with a finite element method. Onset voltage, average current, and outlet average velocity are analyzed with respect to different parameters. Onset voltage is derived by the proposed quadratic regression extrapolation method. Moreover, current is affected by interference and discharge effects, while velocity is also influenced by the suction effect. For the single-wire electrode, high wind speed can be obtained by either increasing channel slope or placing the wire near the entry section. For the double-wire electrode, velocity can be further increased when one of the wires is placed near the inlet and the distance between the two wires is widened. Comparatively, the velocity of the three-wire electrode is higher with larger gaps between wires and stronger discharge effect. The highest velocity is obtained by the four-wire electrode. Comparisons indicate that higher velocity can be obtained with weaker interference effect, stronger suction effect, and intensified discharge effect. Optimum parameter combinations are considered by the Taguchi method. Consequently, velocity can be enhanced by more than 39% after optimization compared with the reference design.

Keyword :

corona discharge accelerators numerical analysis optimization

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GB/T 7714 Zhang, J. F. , Wang, S. , Li, H. Y. et al. Parametric Study and Optimization of Flow Characteristics of Wire-Nonparallel Plate-Type Electrostatic Air Accelerators [J]. | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2018 , 140 (10) .
MLA Zhang, J. F. et al. "Parametric Study and Optimization of Flow Characteristics of Wire-Nonparallel Plate-Type Electrostatic Air Accelerators" . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME 140 . 10 (2018) .
APA Zhang, J. F. , Wang, S. , Li, H. Y. , Qu, Z. G. . Parametric Study and Optimization of Flow Characteristics of Wire-Nonparallel Plate-Type Electrostatic Air Accelerators . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2018 , 140 (10) .
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