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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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One-dimensional numerical study for loop heat pipe with two-phase heat leak model EI
期刊论文 | 2019 , 137 , 467-481 | International Journal of Thermal Sciences
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Abstract :

Heat leak (HL) has a significant influence on the thermal performance of loop heat pipes. It is difficult to measure the HL properties inside the evaporator through proper experiments. In this study, a one-dimensional numerical study is conducted for the HL simulation. A two-phase HL model is proposed, which takes into account the effects of the bubble generation on HL properties and systemic operations. Compared with the traditional conductive HL equation, the present model can clearly describe the two-phase transport characteristics in an evaporator core. The present model is validated by the experimental data of the loop heat pipe (LHP) at different heat loads and heat sink temperatures. The present model improves the prediction accuracy for radial HL in the variable-conductance mode of LHP. By coupling the one-dimensional two-phase HL model with the global LHP model, the two-phase transport properties in the evaporator core, the vapor temperatures, and the HL characteristics are investigated. Due to the existence of bubble generation, the equivalent thermal conductance between the evaporator and reservoir is increased. The HL amount is also induced to increase, which results in an increased vapor temperature especially in the variable-conductance region. The evaporator core contains the subcooled and saturated zones. The variation trends of the fluid temperature, heat transfer coefficient, equilibrium vapor quality, and void fraction are different in the two zones. The subcooled zone in the evaporator core is suggested to be enlarged in order to weaken the effects of bubbles on the system operation. © 2018 Elsevier Masson SAS

Keyword :

Bubble generation Heat leaks Loop Heat Pipe Simulation Two phase

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GB/T 7714 Zhou, L. , Qu, Z.G. , Chen, G. et al. One-dimensional numerical study for loop heat pipe with two-phase heat leak model [J]. | International Journal of Thermal Sciences , 2019 , 137 : 467-481 .
MLA Zhou, L. et al. "One-dimensional numerical study for loop heat pipe with two-phase heat leak model" . | International Journal of Thermal Sciences 137 (2019) : 467-481 .
APA Zhou, L. , Qu, Z.G. , Chen, G. , Huang, J.Y. , Miao, J.Y. . One-dimensional numerical study for loop heat pipe with two-phase heat leak model . | International Journal of Thermal Sciences , 2019 , 137 , 467-481 .
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Numerical Study on Thermal Characteristics of a Micro-Encapsulated Phase Change Composite Plate EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (5) , 1078-1084 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

A coupling numerical model, basing on the enthalpy formulation, is established to study the heat transfer performances of micro-encapsulated phase change composite plate. The temperature profiles and the movement features of solid-liquid phase interface are obtained. The effects of different Stefan numbers, variable phase change temperature scopes are investigated, and none-phase change material condition is calculated. The results show that micro-encapsulated phase change material (MEPCM) plays a great role in thermal insulation. The movement speed of solid phase interface is higher than that of liquid phase interface and the movement speed of liquid phase interface increases obviously when all of the solid phase melted. Furthermore, with the increase of Stefan Number, the movement speeds of the two interfaces and the plate temperature increase. Additionally, the movement speed of solid phase interface and the acceleration of liquid phase interface in the end of phase change process rise with the phase change temperature scope increase. However, the phase change temperature scope has a limited impact on the completely melting time. © 2018, Science Press. All right reserved.

Keyword :

Composite plates Encapsulated phase change materials Heat transfer performance Numerical calculation Phase change heat transfer Phase change temperature Thermal characteristics Thermal Protection System

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GB/T 7714 Fu, Yun-Di , Qu, Zhi-Guo , Zhang, Jia-Jie . Numerical Study on Thermal Characteristics of a Micro-Encapsulated Phase Change Composite Plate [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (5) : 1078-1084 .
MLA Fu, Yun-Di et al. "Numerical Study on Thermal Characteristics of a Micro-Encapsulated Phase Change Composite Plate" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 5 (2018) : 1078-1084 .
APA Fu, Yun-Di , Qu, Zhi-Guo , Zhang, Jia-Jie . Numerical Study on Thermal Characteristics of a Micro-Encapsulated Phase Change Composite Plate . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (5) , 1078-1084 .
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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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An improved detection limit and working range of lateral flow assays based on a mathematical model SCIE PubMed Scopus
期刊论文 | 2018 , 143 (12) , 2775-2783 | ANALYST
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Lateral flow assays (LFAs) have attracted considerable attention in biomedical diagnostics. However, it's still challenging to achieve a high detection sensitivity and extensive working range, mainly because the underlying mechanism of complex reaction processes in LFAs remains unclear. Many mathematical models have been developed to analyze the complex reaction processes, which are only qualitative with limited guidance for LFA design. Now, a semi-quantitative convection-diffusion-reaction model is developed by considering the kinetics of renaturation of nucleic acids and the model is validated by our experiments. We established a method to convert the LFA design parameters between the simulation and experiment (i.e., inlet reporter particle concentration, initial capture probe concentration, and association rate constant), with which we achieved a semi-quantitative comparison of the detection limit and working range between simulations and experiments. Based on our model, we have improved the detection sensitivity and working range by using high concentrations of the inlet reporter particles and initial capture probe. Besides, we also found that target nucleic acid sequences with a high association rate constant are beneficial to improve the LFA performance. The developed model can predict the detection limit and working range and would be helpful to optimize the design of LFAs.

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GB/T 7714 Liu, Zhi , Qu, Zhiguo , Tang, Ruihua et al. An improved detection limit and working range of lateral flow assays based on a mathematical model [J]. | ANALYST , 2018 , 143 (12) : 2775-2783 .
MLA Liu, Zhi et al. "An improved detection limit and working range of lateral flow assays based on a mathematical model" . | ANALYST 143 . 12 (2018) : 2775-2783 .
APA Liu, Zhi , Qu, Zhiguo , Tang, Ruihua , He, Xiaocong , Yang, Hui , Bai, Dan et al. An improved detection limit and working range of lateral flow assays based on a mathematical model . | ANALYST , 2018 , 143 (12) , 2775-2783 .
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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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Renewable Energy Utilization and Energy Conservation in Thermal and Power Systems for China's Sustainable Energy Future EI SCIE
期刊论文 | 2018 , 145 (1) | Journal of Energy Engineering
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GB/T 7714 Chen, Qun , Min, Yong , Jia, Hongjie et al. Renewable Energy Utilization and Energy Conservation in Thermal and Power Systems for China's Sustainable Energy Future [J]. | Journal of Energy Engineering , 2018 , 145 (1) .
MLA Chen, Qun et al. "Renewable Energy Utilization and Energy Conservation in Thermal and Power Systems for China's Sustainable Energy Future" . | Journal of Energy Engineering 145 . 1 (2018) .
APA Chen, Qun , Min, Yong , Jia, Hongjie , Qu, Zhiguo , Chen, Rong , Chen, Lei . Renewable Energy Utilization and Energy Conservation in Thermal and Power Systems for China's Sustainable Energy Future . | Journal of Energy Engineering , 2018 , 145 (1) .
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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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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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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 SCOPUS Cited Count: 4
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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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