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< Page ,Total 23 >
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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Experimental study of the selective catalytic reduction after-treatment for the exhaust emission of a diesel engine Scopus SCIE
期刊论文 | 2019 , 147 , 198-204 | Applied Thermal Engineering
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Abstract :

© 2018 Elsevier Ltd In this experimental study, the after-treatment characteristics of urea-based selective catalytic reduction (urea-SCR) in a diesel engine was investigated at a low engine exhaust temperature (250 °C). This represented the idle state of diesel vehicles during road congestion. Detailed experimental work was performed on a heavy-duty diesel engine test bench under the World Harmonized Transient Cycle. The influence of the ammonia/nitrogen ratio was first investigated using vanadium-based SCR (V-SCR) catalyst. When the ammonia/nitrogen ratio was 1.0, the influences of space velocity on the after-treatment characteristics of two different configurations of V-SCR catalysts were investigated in terms of NOX emission, NH3 slip and NOX conversion efficiency. Small SV resulted in reduction of the NH3 slip and the coated-type catalyst indicated more NH3 slip than the extruded-type catalyst at equal catalyst dimensions. It was concluded that the extruded-type V-SCR catalyst showed better operating characteristics than did the coated-type V-SCR catalyst.

Keyword :

Ammonia/nitrogen ratio Catalyst Diesel engine Selective catalytic reduction Space velocity

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GB/T 7714 Xu, H. T. , Luo, Z. Q. , Wang, N. et al. Experimental study of the selective catalytic reduction after-treatment for the exhaust emission of a diesel engine [J]. | Applied Thermal Engineering , 2019 , 147 : 198-204 .
MLA Xu, H. T. et al. "Experimental study of the selective catalytic reduction after-treatment for the exhaust emission of a diesel engine" . | Applied Thermal Engineering 147 (2019) : 198-204 .
APA Xu, H. T. , Luo, Z. Q. , Wang, N. , Qu, Z. G. , Chen, J. , An, L. . Experimental study of the selective catalytic reduction after-treatment for the exhaust emission of a diesel engine . | Applied Thermal Engineering , 2019 , 147 , 198-204 .
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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 | 2019 , 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 , 2019 , 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 (2019) .
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 , 2019 , 145 (1) .
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Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix EI Scopus CSCD SCIE
期刊论文 | 2019 , 28 (1) , 1-16 | Journal of Thermal Science
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Abstract :

Shale gas is becoming an increasingly promising alternative energy resource because of its high efficiency and environment-friendly characteristic. The amount of adsorbed gas on the shale matrix surfaces and dissolved gas in the shale matrix bulk is the dominant factor in the long-term productivity of shale reservoir. Although experimental measurements have been extensively carried out to investigate the gas adsorption and diffusion properties in the shale matrix, they cannot provide the detailed information on the microscopic transport mechanism of shale gas during the gas production process. Molecular simulation can accurately visualize the gas adsorption/desorption and diffusion processes in the shale matrix. In the present study, the recent research advances of molecular simulation on gas adsorption/desorption and diffusion in the shale matrix are reviewed. Firstly, the density functional theory (DFT) for shale gas molecule desorption/adsorption on the surface of the matrix crystal is illustrated. Then, the grand canonical Monte Carlo (GCMC) method predicting the amount of shale gas desorption/adsorption in the shale matrix crystal is introduced. Finally, molecular dynamics simulation (MD) for gas diffusion in the shale matrix is elucidated. Further developments of the molecular simulation method in shale gas production are also discussed. © 2018, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature.

Keyword :

Adsorption/desorption Alternative energy resources Diffusion properties Environment friendly Gas production process Grand canonical Monte carlo Molecular dynamics simulations Molecular simulations

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GB/T 7714 Wand, Hui , Qu, Zhiguo , Yin, Ying et al. Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix [J]. | Journal of Thermal Science , 2019 , 28 (1) : 1-16 .
MLA Wand, Hui et al. "Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix" . | Journal of Thermal Science 28 . 1 (2019) : 1-16 .
APA Wand, Hui , Qu, Zhiguo , Yin, Ying , Bai, Junqiang , Yu, Bo . Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix . | Journal of Thermal Science , 2019 , 28 (1) , 1-16 .
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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 SCIE
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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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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Energy Conversion Study Based On Nanoparticle Plasmonic Solar Cell EI CSCD PKU
期刊论文 | 2018 , 39 (1) , 179-184 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

Based on nanoparticle plasmonic solar cell, the photoelectronic performance of solar cell matrix and photothermal performance of nanoparticles after light absorption were comprehensively analysed. The energy conversion for photothermal or photoelectronic process can be regulated and controlled by varying particles' size materials and shape. The results show that silver particles give stronger enhancement on photoelectronic performance while gold particles behaves better on photothermal performance. For spherical silver particles, both the photoelectronic and photothermal performance could be enhanced with the increase of diameter. For spherical gold particles, photothermal performance would be enhanced but photoelectronic performance weakened. For both cylindrical silver and gold particles, photoelectronic performance could be weakened with the increase of diameter, while photothermal performance enhanced. © 2018, Science Press. All right reserved.

Keyword :

Cell matrix Gold particles Photo-thermal Photoelectronic Plasmonic enhancements Plasmonic solar cells Silver particles

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GB/T 7714 Zhang, Jia-Jia , Qu, Zhi-Guo , Liu, Yong . Energy Conversion Study Based On Nanoparticle Plasmonic Solar Cell [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (1) : 179-184 .
MLA Zhang, Jia-Jia et al. "Energy Conversion Study Based On Nanoparticle Plasmonic Solar Cell" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 1 (2018) : 179-184 .
APA Zhang, Jia-Jia , Qu, Zhi-Guo , Liu, Yong . Energy Conversion Study Based On Nanoparticle Plasmonic Solar Cell . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (1) , 179-184 .
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Erratum to: Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix (Journal of Thermal Science, (2018), 10.1007/s11630-018-1053-9) EI Scopus CSCD
期刊论文 | 2018 | Journal of Thermal Science
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Abstract :

In the originally published article version the family name of first author WANG Hui was misspellt “WAND”. The original article has been corrected. © 2018, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature.

Keyword :

Adsorption/desorption Molecular simulations Thermal science

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GB/T 7714 Wang, Hui , Qu, Zhiguo , Yin, Ying et al. Erratum to: Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix (Journal of Thermal Science, (2018), 10.1007/s11630-018-1053-9) [J]. | Journal of Thermal Science , 2018 .
MLA Wang, Hui et al. "Erratum to: Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix (Journal of Thermal Science, (2018), 10.1007/s11630-018-1053-9)" . | Journal of Thermal Science (2018) .
APA Wang, Hui , Qu, Zhiguo , Yin, Ying , Bai, Junqiang , Yu, Bo . Erratum to: Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix (Journal of Thermal Science, (2018), 10.1007/s11630-018-1053-9) . | Journal of Thermal Science , 2018 .
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Sound absorption characteristics of air background-based gradient phononic crystals EI
会议论文 | 2018 , 6 , 3445-3452 | 25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018
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Abstract :

Our group has designed three-dimensional (3D) continuously graded phononic crystals (PCs) and experimentally studied the sound absorption characteristics of the continuously graded PCs. However, no attention has been paid on air background-based gradient phononic crystals (GPCs), for which the inclusions and the matrixes are photosensitive resin and air respectively. In this paper, the acoustic characteristics of air background-based GPCs are investigated and discussed. The uniform phononic crystals (UPCs) are designed for reference. The experimental results show that, compared with UPCs, the GPCs have better sound absorption performance when the frequency is from 2750 Hz to 5500 Hz. And there is good agreement between the experimental results and semi-analytical results of sound absorption coefficients of the two kinds of PCs. The relationship between sound absorption coefficient and specific acoustic impedance is discussed as well. The specific acoustic resistances and specific acoustic reactances of the GPC-0.6-30 mm are more close to the 300-900 Pa•s/m and 0 Pa•s/m respectively, which result in better sound absorption performance. The GPCs are expected to have potential application in the noise control. Copyright © (2018) by International Institute of Acoustics & Vibration. All rights reserved.

Keyword :

Acoustic characteristic Graded phononic crystal Phononic Crystal Photosensitive resins Sound absorption Sound absorption characteristic Sound absorption coefficients Threedimensional (3-d)

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GB/T 7714 Zhang, X.H. , Qu, Z.G. . Sound absorption characteristics of air background-based gradient phononic crystals [C] . 2018 : 3445-3452 .
MLA Zhang, X.H. et al. "Sound absorption characteristics of air background-based gradient phononic crystals" . (2018) : 3445-3452 .
APA Zhang, X.H. , Qu, Z.G. . Sound absorption characteristics of air background-based gradient phononic crystals . (2018) : 3445-3452 .
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The importance of controlling the upstream body wake in tandem cylinders system for noise reduction EI SCIE Scopus
期刊论文 | 2018 , 232 (3) , 517-531 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
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This work numerically investigates the importance of controlling the wake of upstream body in the tandem cylinders aiming at aerodynamics noise reduction. The two-dimensional unsteady Reynolds-averaged Navier-Stokes approach with the k- turbulence model and Ffowcs Williams-Hawkings method are employed to simulate the flow field and the aerodynamics noise, respectively. The flow in the porous media is calculated by a volume-averaged model. Analogy to the mass-spring-damper system, one preliminary model is proposed to reveal the key role of stabilizing the upstream body wake. The simulations of different porous materials coating designs are implemented to corroborate the model and provide more details of flow modification by porous materials coating. Results indicate that the porous materials coating designed on the upstream cylinder can decrease the wake impingement on the downstream cylinder via suppressing the vortex shedding. Subsequently, not only the tonal noise but also the broadband noise level of tandem system can be reduced. It is also clarified that the effects of downstream cylinder absorption and downstream cylinder wake control by porous materials coating is not comparable with the upstream cylinder wake control. The present study gives a new idea to flow control and noise reduction of the multibody systems considering efficiency and economy.

Keyword :

Wake interaction flow control tandem cylinders noise reduction porous materials coating

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GB/T 7714 Liu, Hanru , Wang, Yangang , Wei, Jinjia et al. The importance of controlling the upstream body wake in tandem cylinders system for noise reduction [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2018 , 232 (3) : 517-531 .
MLA Liu, Hanru et al. "The importance of controlling the upstream body wake in tandem cylinders system for noise reduction" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING 232 . 3 (2018) : 517-531 .
APA Liu, Hanru , Wang, Yangang , Wei, Jinjia , Qu, Zhiguo . The importance of controlling the upstream body wake in tandem cylinders system for noise reduction . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2018 , 232 (3) , 517-531 .
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