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The numerical study of vanadium redox flow battery performance with different electrode morphologies and electrolyte inflow patterns EI SCIE
期刊论文 | 2021 , 33 | Journal of Energy Storage
WoS CC Cited Count: 5
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Abstract :

Electrode morphological features and the electrolyte inflow pattern are important factors in determining the performance of vanadium redox flow batteries. In this study, a 2-D numerical model that couples electrolyte flow, ion diffusion, and electrochemical reaction is proposed to quantitatively investigate the mass transport and electrochemical reactions at various electrode structures, including the effects of porosity, fiber size, and fiber array pattern, as well as the electrode compression and the electrolyte inflow pattern. The influence of stochastic seeds on the reconstructed geometry was considered and assemble average value was conducted. The established model with the reconstructed geometry has been validated by experiment. The specific surface area, flow resistance, and VO2+ consumption rate increase with a decreasing in electrode porosity and fiber diameter. The fiber array pattern with a 'outlet dense and inlet sparse' structure shows the optimum performance of rapid VO2+ consumption rate and high electrode utilization. The mass transport is dominated by convection in a wide flow path within the electrode, and the collective effects of convection and diffusion are found in a narrow flow path. The main advantage of the compressed electrode is the enhanced electrode utilization. A turning point at a stoich (the ratio of input reactant moles versus the consumed moles at a certain applied current) about 1000 was identified, below which the consumption rate of the flow-through pattern is higher than that of the flow field pattern and above which the consumption rate of the former pattern is slower than the latter. A faster fuel feed in the electrode with a narrower flow channel contributes to a faster species consumption rate in the last stage of the discharge process. The present study provides practical guidance for the design and optimization of VRFB electrode. © 2020 Elsevier Ltd

Keyword :

Channel flow Electric discharges Electrochemical electrodes Electrolytes Fibers Flow batteries Porosity Stochastic systems Structural optimization Vanadium Vanadium dioxide

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GB/T 7714 Wang, Q , Qu, Z.G , Jiang, Z.Y et al. The numerical study of vanadium redox flow battery performance with different electrode morphologies and electrolyte inflow patterns [J]. | Journal of Energy Storage , 2021 , 33 .
MLA Wang, Q et al. "The numerical study of vanadium redox flow battery performance with different electrode morphologies and electrolyte inflow patterns" . | Journal of Energy Storage 33 (2021) .
APA Wang, Q , Qu, Z.G , Jiang, Z.Y , Yin, Y , Chen, L . The numerical study of vanadium redox flow battery performance with different electrode morphologies and electrolyte inflow patterns . | Journal of Energy Storage , 2021 , 33 .
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Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure EI SCIE Scopus
期刊论文 | 2019 , 57 , 101-107 | Nano Energy | IF: 16.602
WoS CC Cited Count: 10 SCOPUS Cited Count: 17
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Abstract :

Energy consumption continues to rise as society develops worldwide. Meanwhile, a lot of energy is wasted in the form of heat from various devices and systems. Here we report a new power generator, which works based on a difference in H+-ion concentration in a fuel cell structure and produces electricity by harvesting waste heat. The device works via the following three successive processes: H2 is oxidized at anode to H+ ions, the H+ ions then penetrate through a phosphoric acid-treated polybenzimidazole (PBI-PA) membrane and finally the H+ ions get reduced to H2 at cathode with electrons coming through external circuit from the anode. This system generates electricity at a current density of 21 mA cm−2 and a power density of 1.03 mW cm−2 at 170 °C. The cell's thermoelectric conversion efficiency at 170 °C is 13.72%, which is higher than typical values reported for many common thermoelectric materials in low temperature regimes. This innovative approach may allow for efficient generation of electricity from waste heat. © 2018 Elsevier Ltd

Keyword :

Electrical energy Innovative approaches Ion concentrations Low-temperature regime Renewable energies Thermal conversion Thermoelectric conversion efficiency Thermo-Electric materials

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GB/T 7714 Liu, Yan , Chen, Yuanzhen , Ming, Jun et al. Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure [J]. | Nano Energy , 2019 , 57 : 101-107 .
MLA Liu, Yan et al. "Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure" . | Nano Energy 57 (2019) : 101-107 .
APA Liu, Yan , Chen, Yuanzhen , Ming, Jun , Chen, Li , Shu, Chengyong , Qu, Ting et al. Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure . | Nano Energy , 2019 , 57 , 101-107 .
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Influences of the perforation on effective transport properties of gas diffusion layers EI SCIE Scopus
期刊论文 | 2018 , 126 , 243-255 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 4.346
WoS CC Cited Count: 35 SCOPUS Cited Count: 49
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Abstract :

In this paper, the through-plane and in-plane effective transport properties, including permeability, diffusivity and thermal conductivity, of the perforated gas diffusion layer (GDL) are predicted using multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) based on stochastic reconstructed microstructures. When predicting effective thermal conductivities of GDL, the effect of anisotropic conductive property of fibers is considered. The effective transport properties of dry perforated GDL are fitted as a function of perforation diameter and porosity. It is found that the permeability and effective diffusivity of GDL increase with perforation diameter and porosity while the effective thermal conductivity decreases. The two-phase LBM is adopted to simulate water distributions in perforated GDLs, and dependences of effective transport properties on saturation are then obtained. The results show that: the existence of the perforation significantly affects the water transport in hydrophobic perforated GDLs if its diameter is larger than the average pore size of GDL. The effective permeability and diffusivity of GDL decrease while effective thermal conductivity increases with saturation. The effective transport properties of perforated GDLs change less significantly with saturation than those of non-perforated GDL if the water droplet intruding into the perforation is displaced, while change more rapidly with saturation if the water droplet remains inside the perforation. (C) 2018 Published by Elsevier Ltd.

Keyword :

Effective transport property Gas diffusion layer Lattice Boltzmann method Multiple-relaxation-time Perforation Saturation

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GB/T 7714 Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li et al. Influences of the perforation on effective transport properties of gas diffusion layers [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 : 243-255 .
MLA Fang, Wen-Zhen et al. "Influences of the perforation on effective transport properties of gas diffusion layers" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 126 (2018) : 243-255 .
APA Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . Influences of the perforation on effective transport properties of gas diffusion layers . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 , 243-255 .
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Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping EI SCIE Scopus
期刊论文 | 2018 , 116 , 208-218 | ADVANCES IN WATER RESOURCES | IF: 3.673
WoS CC Cited Count: 30 SCOPUS Cited Count: 59
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Abstract :

Solubility trapping is crucial for permanent CO 2 sequestration in deep saline aquifers. For the first time, a pore-scale numerical method is developed to investigate coupled scCO(2)-water two-phase flow, multicomponent (CO2(aq), H+, HCO3, CO32- and OH ) mass transport, heterogeneous interfacial dissolution reaction, and homogeneous dissociation reactions. Pore-scale details of evolutions of multiphase distributions and concentration fields are presented and discussed. Time evolutions of several variables including averaged CO2(aq) concentration, scCO(2) saturation, and pH value are analyzed. Specific interfacial length, an important variable which cannot be determined but is required by continuum models, is investigated in detail. Mass transport coefficient or efficient dissolution rate is also evaluated. The pore-scale results show strong non-equilibrium characteristics during solubility trapping due to non-uniform distributions of multiphase as well as slow mass transport process. Complicated coupling mechanisms between multiphase flow, mass transport and chemical reactions are also revealed. Finally, effects of wettability are also studied. The pore-scale studies provide deep understanding of non-linear non-equilibrium multiple physicochemical processes during CO2 solubility trapping processes, and also allow to quantitatively predict some important empirical relationships, such as saturation-interfacial surface area, for continuum models.

Keyword :

CO2 sequestration Lattice Boltzmann method Multiphase flow Porous media Reactive transport Solubility trapping

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GB/T 7714 Chen, Li , Wang, Mengyi , Kang, Qinjun et al. Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping [J]. | ADVANCES IN WATER RESOURCES , 2018 , 116 : 208-218 .
MLA Chen, Li et al. "Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping" . | ADVANCES IN WATER RESOURCES 116 (2018) : 208-218 .
APA Chen, Li , Wang, Mengyi , Kang, Qinjun , Tao, Wenquan . Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping . | ADVANCES IN WATER RESOURCES , 2018 , 116 , 208-218 .
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A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids EI SCIE Scopus
期刊论文 | 2018 , 138 , 122-132 | APPLIED THERMAL ENGINEERING | IF: 4.026
WoS CC Cited Count: 28 SCOPUS Cited Count: 40
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Abstract :

In the present paper, a patching type multi-block lattice Boltzmann method is adopted to predict the thermal contact resistance (TCR) at the interface of two solids. The rough surfaces of contact materials are reconstructed based on the fractal theory and the contact pressure is obtained based on the plastic deformation model. The accuracy of the patching type multi-block lattice Boltzmann method is validated by some benchmarks. After validations, effects of the contact pressure, roughness, thermal conductivity of contact material, thermal conductivity of interstitial medium, temperature and radiation on TCR are investigated. The results show that: the TCR decreases when the contact pressure increases, but increases with the root-mean-square roughness; the TCR of two contact aluminums decreases faster than that of stainless steels when contact pressure increases; a higher thermal conductivity of contact materials leads to a smaller TCR; when the thermal conductivity of interstitial medium is close to zero or the gap is in vacuum, the TCR is much larger than that filled with air, especially at low contact pressure; at the high temperature, the contribution of the radiation to the TCR becomes appreciable if the thermal conductivity of the interstitial medium is low. Especially when the gap is in vacuum, the contribution of radiation on the TCR cannot be neglected.

Keyword :

Fractal Lattice Boltzmann method Multi-block Thermal contact resistance

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GB/T 7714 Fang, Wen-Zhen , Gou, Jian-Jun , Chen, Li et al. A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids [J]. | APPLIED THERMAL ENGINEERING , 2018 , 138 : 122-132 .
MLA Fang, Wen-Zhen et al. "A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids" . | APPLIED THERMAL ENGINEERING 138 (2018) : 122-132 .
APA Fang, Wen-Zhen , Gou, Jian-Jun , Chen, Li , Tao, Wen-Quan . A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids . | APPLIED THERMAL ENGINEERING , 2018 , 138 , 122-132 .
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EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL CPCI-S SCIE
会议论文 | 2018 , 49 (11) , 1003-1022 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT) | IF: 0.398
WoS CC Cited Count: 4
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Abstract :

Nucleate boiling heat transfer (NBHT) from enhanced structures is an effective way to dissipate a high heat flux. In the present study, the behavior of cavities with nucleation on roughened surfaces is studied numerically during the entire ebullition cycle based on the phase-change lattice Boltzmann method. The adopted model is firstly validated by the Laplace law and the two-phase coexistence curve and then is applied to investigate the effects of the cavity structure on NBHT. The bubble departure diameter, departure frequency, and the total boiling heat flux of the ebullition cycle are also studied. It is shown that the cavity widths and the cavity grooves exhibit a significant influence on the NBHT features. A cavity with a circular groove in the present research shows the best performance for NBHT in terms of the averaged heat flux and bubble release frequency. When a specific cavity is combined with other different cavities on roughened surfaces, its nucleation process on different roughened surfaces may differ greatly.

Keyword :

bubble dynamics cavity groove lattice Boltzmann method nucleate boiling

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GB/T 7714 Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun et al. EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL [C] . 2018 : 1003-1022 .
MLA Mu, Yu-Tong et al. "EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL" . (2018) : 1003-1022 .
APA Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL . (2018) : 1003-1022 .
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Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells EI Scopus SCIE
期刊论文 | 2018 , 400 , 114-125 | Journal of Power Sources | IF: 7.467
WoS CC Cited Count: 44 SCOPUS Cited Count: 76
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Abstract :

Reducing Platinum amount in proton exchange membrane fuel cell (PEMFC) is one of the main tasks to achieve low cost PEMFC. Recently, significant performance loss has been found under low Pt loading due to local mass transport limitations. In this study, pore-scale simulations are conducted to study oxygen transport within four-constituent microscopic structures of catalyst layer including a carbon particle, ionomer, Pt particles, and primary pores inside the carbon particle. Multiphase physicochemical processes are considered, including oxygen dissolution at the pore/ionomer interface, oxygen diffusion within the ionomer film and inside the primary pores, and reactions at the Pt interface. Local transport resistance is calculated based on the pore-scale concentration field predicted. The simulation results are compared with existing experimental results and 1D models. Simulation results show that dissolution resistance at the secondary pore/ionomer interface is about 10–50 times higher than that inside the ionomoer. Local transport resistance increases as Pt loading decreases, especially under Pt loading of 0.1 mg cm−2. Besides, local transport resistance can be reduced by depositing more Pt outside the carbon particle, alleviating agglomeration and/or decreasing the ionomer thickness. The simulation results indicate that local transport characteristics should be considered when developing 1D agglomeration model of catalyst layer. © 2018 Elsevier B.V.

Keyword :

Catalyst layers Lattice Boltzmann method Local transport Mass transport limitation Microscopic structures Nano-scale simulations Physicochemical process Pore-scale simulation

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GB/T 7714 Chen, Li , Zhang, Ruiyuan , He, Pu et al. Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells [J]. | Journal of Power Sources , 2018 , 400 : 114-125 .
MLA Chen, Li et al. "Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells" . | Journal of Power Sources 400 (2018) : 114-125 .
APA Chen, Li , Zhang, Ruiyuan , He, Pu , Kang, Qinjun , He, Ya-Ling , Tao, Wen-Quan . Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells . | Journal of Power Sources , 2018 , 400 , 114-125 .
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Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media EI SCIE Scopus
期刊论文 | 2018 , 349 , 428-437 | CHEMICAL ENGINEERING JOURNAL | IF: 8.355
WoS CC Cited Count: 45 SCOPUS Cited Count: 73
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Abstract :

For applications of reactive transport in porous media, optimal porous structures should possess both high surface area for reactive sites loading and low mass transport resistance. Hierarchical porous media with a combination of pores at different scales are designed for this purpose. Using the lattice Boltzmann method, pore-scale numerical studies are conducted to investigate diffusion-reaction processes in 2D hierarchical porous media generated by self-developed reconstruction scheme. Complex interactions between porous structures and reactive transport are revealed under different conditions. Simulation results show that adding macropores can greatly enhance the mass transport, but at the same time reduce the reactive surface, leading to complex change trend of the total reaction rate. Effects of gradient distribution of macropores within the porous medium are also investigated. It is found that a front-loose, back-tight (FLBT) hierarchical structure is desirable for enhancing mass transport, increasing total reaction rate, and improving catalyst utilization. On the whole, from the viewpoint of reducing cost and improving material performance, hierarchical porous structures, especially gradient structures with the size of macropores gradually decreasing along the transport direction, are desirable for catalyst application.

Keyword :

Catalyst utilization Gradient distribution Hierarchical porous media Lattice Boltzmann method Pore-scale

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GB/T 7714 Chen, Li , Zhang, Ruiyuan , Min, Ting et al. Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media [J]. | CHEMICAL ENGINEERING JOURNAL , 2018 , 349 : 428-437 .
MLA Chen, Li et al. "Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media" . | CHEMICAL ENGINEERING JOURNAL 349 (2018) : 428-437 .
APA Chen, Li , Zhang, Ruiyuan , Min, Ting , Kang, Qinjun , Tao, Wenquan . Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media . | CHEMICAL ENGINEERING JOURNAL , 2018 , 349 , 428-437 .
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Beyond-Cassie Mode of Wetting and Local Contact Angles of Droplets on Checkboard-Patterned Surfaces EI SCIE PubMed Scopus
期刊论文 | 2017 , 33 (24) , 6192-6200 | LANGMUIR | IF: 3.789
WoS CC Cited Count: 29 SCOPUS Cited Count: 32
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Abstract :

Droplet wetting and distortion on flat surfaces with heterogeneous wettability are studied using the 3D Shan Chen pseudopotential multiphase lattice Boltzmann model (LBM). The contact angles are compared with the Cassie mode, which predicts an apparent contact angle for flat surfaces with different wetting properties, where the droplet size is large compared to the size of the heterogeneity. In this study, the surface studied consists in a regular checkboard pattern with two different Young's contact angles (hydrophilic and hydrophobic) and equal surface fraction. The droplet size and patch size of the checkboard are varied beyond the limit where Cassie's equation is valid. A critical ratio of patch size to droplet radius is found below which the apparent contact angle follows the Cassie mode. Above the critical value, the droplet shape changes from a spherical cap to a more distorted form, and no single contact angle can be determined. The local contact angles are found to vary along the contact line between minimum and maximum values. The droplet is found to wet preferentially the hydrophilic region, and the wetted area fraction of the hydrophilic region increases quasi-linearly with the ratio between patch and droplet sizes. We propose a new equation beyond the critical ratio, defining an equivalent contact angle, where the wetted area fractions are used as weighting coefficients for the maximum and minimum local contact angles. This equivalent contact angle is found to equal Cassie's contact angle.

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GB/T 7714 Carmeliet, Jan , Chen, Li , Kang, Qinjun et al. Beyond-Cassie Mode of Wetting and Local Contact Angles of Droplets on Checkboard-Patterned Surfaces [J]. | LANGMUIR , 2017 , 33 (24) : 6192-6200 .
MLA Carmeliet, Jan et al. "Beyond-Cassie Mode of Wetting and Local Contact Angles of Droplets on Checkboard-Patterned Surfaces" . | LANGMUIR 33 . 24 (2017) : 6192-6200 .
APA Carmeliet, Jan , Chen, Li , Kang, Qinjun , Derome, Dominique . Beyond-Cassie Mode of Wetting and Local Contact Angles of Droplets on Checkboard-Patterned Surfaces . | LANGMUIR , 2017 , 33 (24) , 6192-6200 .
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Numerical predictions of thermal conductivities for the silica aerogel and its composites EI SCIE Scopus
期刊论文 | 2017 , 115 , 1277-1286 | APPLIED THERMAL ENGINEERING | IF: 3.771
WoS CC Cited Count: 38 SCOPUS Cited Count: 53
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Abstract :

In the present paper, two kinds of microstructures are reconstructed for silica aerogels by diffusion limited cluster-cluster aggregation (DLCA) method and open-cell structure generation method. The discrete ordinate method is adopted to solve radiative transfer equation, and the lattice Boltzmann method (LBM) is adopted to solve the conduction-radiation equation to predict the effective thermal Conductivity considering the combined contribution of conduction and radiation. The partial bounce back scheme for thermal IBM is extended to consider the thermal contact resistance between two contact components with different thermal conductivity in aerogels. To validate the accuracy of the present model, some corresponding experimental measurements based on Hot Disk method are conducted. The results show that: the open-cell structure is more suitable for the real aerogel microstructure than DLCA structure; the effective thermal conductivity of the pure aerogel increases rapidly with temperature and is greatly suppressed if additives are doped; the Rosseland equation will over-predict the effective thermal conductivity of pure aerogels, especially at high temperature, but it can be applied for aerogel composites if the optical thickness assumption is satisfied; the thermal contact resistance in aerogels has a significant influence on their effective thermal conductivity, and a larger thermal contact resistance leads to a smaller effective thermal conductivity. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Discrete ordinate method Effective thermal conductivity Lattice Boltzmann method Silica aerogel Thermal contact resistance

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GB/T 7714 Fang, Wen-Zhen , Zhang, Hu , Chen, Li et al. Numerical predictions of thermal conductivities for the silica aerogel and its composites [J]. | APPLIED THERMAL ENGINEERING , 2017 , 115 : 1277-1286 .
MLA Fang, Wen-Zhen et al. "Numerical predictions of thermal conductivities for the silica aerogel and its composites" . | APPLIED THERMAL ENGINEERING 115 (2017) : 1277-1286 .
APA Fang, Wen-Zhen , Zhang, Hu , Chen, Li , Tao, Wen-Quan . Numerical predictions of thermal conductivities for the silica aerogel and its composites . | APPLIED THERMAL ENGINEERING , 2017 , 115 , 1277-1286 .
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