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Atmospheric humidity and particle charging state on agglomeration of aerosol particles Scopus SCIE
期刊论文 | 2019 , 197 , 141-149 | Atmospheric Environment
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© 2018 Formation of haze is a phenomenon dependent on the relative atmospheric humidity and concentration of aerosol particles. The physical and chemical reactions on particle surfaces would lead to variations in particle sizes. This paper focuses on the physical behaviour of aerosol particles under the influence of atmospheric humidity, which produces liquid bridging forces and electrostatic interactions among particles. By water absorption experiment, a correlation between relative humidity (RH) and water content on particles was obtained. Through theoretical derivation, a relationship between the relative humidity and humidity ratio was established for calculating liquid bridging forces. The findings from experiments on atmospheric particles charging, showed most aerosols were negatively or positively charged and the average charges on these particles was more than one. An extended soft-sphere discrete element method (DEM) was used to simulate the evolution of aerosol particles, encapsulated in water vapour by considering liquid bridging forces, electrostatic interactions and Brownian forces. Results suggest that the agglomeration rate of particles would increase with a rise in the atmospheric humidity due to the increased liquid bridging forces that enhance the agglomeration velocity. The higher humidity would enhance the ionization on particle surfaces, which could affect electrostatic interactions. This paper provides an insight of a mechanism for formation of haze in atmosphere.

Keyword :

Aerosol particles Agglomeration rate Atmospheric humidity Electrostatic interactions Haze formation Liquid bridging forces Particle charging

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GB/T 7714 He, Yuanping , Gu, Zhaolin , Lu, Weizhen et al. Atmospheric humidity and particle charging state on agglomeration of aerosol particles [J]. | Atmospheric Environment , 2019 , 197 : 141-149 .
MLA He, Yuanping et al. "Atmospheric humidity and particle charging state on agglomeration of aerosol particles" . | Atmospheric Environment 197 (2019) : 141-149 .
APA He, Yuanping , Gu, Zhaolin , Lu, Weizhen , Zhang, Liyuan , Okuda, Tomoaki , Fujioka, Kentaro et al. Atmospheric humidity and particle charging state on agglomeration of aerosol particles . | Atmospheric Environment , 2019 , 197 , 141-149 .
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Pore-scale direct numerical simulation of particle transport in porous media SCIE
期刊论文 | 2019 , 199 , 613-627 | CHEMICAL ENGINEERING SCIENCE
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A computational platform for direct numerical simulation of fluid-particle two-phase flow in porous media is presented in this study. In the proposed platform, the Navier-Stokes equations are used to describe the motion of the continuous phase, while the discrete element method (DEM) is employed to evaluate particle-particle and particle-wall interactions, with a fictitious domain method being adopted to evaluate particle-fluid interactions. Particle-wall contact states are detected by the ERIGID scheme. Moreover, a new scheme, namely, base point-increment method is developed to improve the accuracy of particle tracking in porous media. In order to improve computationally efficiency, a time splitting strategy is applied to couple the fluid and DEM solvers, allowing different time steps to be used which are adaptively determined according to the stability conditions of each solver. The proposed platform is applied to particle transport in a porous medium with its pore structure being reconstructed from micro-CT scans from a real rock. By incorporating the effect of pore structure which has a comparable size to the particles, numerical results reveal a number of distinct microscopic flow mechanisms and the corresponding macroscopic characteristics. The time evolution of the inlet to outlet pressure-difference consists of large-scale spikes and small-scale fluctuations. Apart from the influence through direct contacts between particles, the motion of a particle can also be affected by particles without contact through blocking a nearby passage for fluid flow. Particle size has a profound influence on the macroscopic motion behavior of particles. Small particles are easier to move along the main stream and less dispersive in the direction perpendicular to the flow than large particles. (C) 2019 Elsevier Ltd. All rights reserved.

Keyword :

Fictitious domain method Discrete element method Pore scale Fluid-particle flow

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GB/T 7714 Su, Junwei , Chai, Guoliang , Wang, Le et al. Pore-scale direct numerical simulation of particle transport in porous media [J]. | CHEMICAL ENGINEERING SCIENCE , 2019 , 199 : 613-627 .
MLA Su, Junwei et al. "Pore-scale direct numerical simulation of particle transport in porous media" . | CHEMICAL ENGINEERING SCIENCE 199 (2019) : 613-627 .
APA Su, Junwei , Chai, Guoliang , Wang, Le , Cao, Weidong , Gu, Zhaolin , Chen, Chungang et al. Pore-scale direct numerical simulation of particle transport in porous media . | CHEMICAL ENGINEERING SCIENCE , 2019 , 199 , 613-627 .
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A new urban canopy parameterization scheme for wind environment simulations SCIE Scopus
期刊论文 | 2018 , 27 (3) , 402-422 | INDOOR AND BUILT ENVIRONMENT
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This paper concerns urban canopies populated with tall slender buildings. To clarify the controlling factors of urban canopies, we simulated a series of single high-rise buildings under fully developed turbulence at a realistic scale by large-eddy simulation. We then analysed correlations between the drag force and recirculation area, frontal area, surface area, floor area, porosity and inlet velocity. Our results show that the recirculation length and recirculation area were proportional to the width, height and wind speed, but were inversely proportional to the length of a building. New equations for the recirculation length and area are presented. The maximum error of the recirculation length equation was 6.66%, and the maximum error of the recirculation area equation was 7.49%. The drag source characteristic length was found to be proportional to the recirculation area, frontal area and surface area and inversely proportional to the porosity and height, but was not closely related to floor area. A new local scale drag source model was developed and applied to a complex urban canopy of Xi'an. The model was applied to 7x7 buildings and show good agreement with the solid wall simulation results.

Keyword :

High-rise building Recirculation area Urban canopy parameterization Frontal area Wind environment

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GB/T 7714 Duan, Cuie , Lu, Weizhen , Zhang, Yunwei et al. A new urban canopy parameterization scheme for wind environment simulations [J]. | INDOOR AND BUILT ENVIRONMENT , 2018 , 27 (3) : 402-422 .
MLA Duan, Cuie et al. "A new urban canopy parameterization scheme for wind environment simulations" . | INDOOR AND BUILT ENVIRONMENT 27 . 3 (2018) : 402-422 .
APA Duan, Cuie , Lu, Weizhen , Zhang, Yunwei , Gu, Zhaolin . A new urban canopy parameterization scheme for wind environment simulations . | INDOOR AND BUILT ENVIRONMENT , 2018 , 27 (3) , 402-422 .
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膜蒸馏技术在溶液蓄能中的应用 CSCD PKU
期刊论文 | 2018 , (3) , 7-12 | 制冷学报
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本文以太阳能热利用和蓄能技术为研究背景,提出了一种基于膜蒸馏的太阳能溶液蓄能模式.采用疏水性聚偏氟乙烯中空纤维膜为膜蒸馏材料,基于膜蒸馏常温操作、小温差大传热面积的特点,利用膜材料微观上的高比表面积和单位体积的高接触面积为载体,选取50%溴化锂溶液为工质,以减压膜蒸馏的方式进行溶液浓缩和潜能存储,浓缩后的溶液可作为吸收式热力系统的工质.为此,针对50%的溴化锂溶液进行了减压膜蒸馏实验,对不同溶液温度、溶液流量在不同真空度下进行减压膜蒸馏实验,得到了3组实验数据.根据实验结果,对膜蒸馏式溶液蓄能系统进行分析,结果表明:蓄能密度可以达到245 kJ/kg,单位面积的膜组件可以产生0.27~0.40 kW的蓄能量,膜蒸馏式溶液蓄能为太阳能利用、吸收式热力系统和蓄能技术提供了一种新的应用方法和途径.

Keyword :

溶液蓄能 太阳能 膜蒸馏 中空纤维膜

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GB/T 7714 王赞社 , 胡俊涛 , 顾兆林 et al. 膜蒸馏技术在溶液蓄能中的应用 [J]. | 制冷学报 , 2018 , (3) : 7-12 .
MLA 王赞社 et al. "膜蒸馏技术在溶液蓄能中的应用" . | 制冷学报 3 (2018) : 7-12 .
APA 王赞社 , 胡俊涛 , 顾兆林 , 杨利生 . 膜蒸馏技术在溶液蓄能中的应用 . | 制冷学报 , 2018 , (3) , 7-12 .
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Research of evaporative cooling experiment in summer of residential buildings in Xi'an EI
会议论文 | 2018 , 152 , 928-934 | 2018 Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018
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Abstract :

Evaporative cooling is a kind of technology to utilize the decalescence and cooling of evaporation of water. In order to decrease the relative humidity of outdoor fresh air and improve the applied range of evaporative cooling techniques, a novel evaporative cooling experimental system that employs solar energy powered reel dehumidifying system to pretreat the outdoor fresh air is proposed in this research. Experimental tests for this system were performed in a typical residential building in Xi'an. The result shows that the evaporative cooling system can effectively decrease the indoor temperature to 28℃, and maintain the relative humidity to about 70%. The solar energy powered reel dehumidifying system can further improve the operation effect of this system. The research result has directive significance to promote the evaporative cooling system in the future application in residential buildings. Copyright © 2018 Elsevier Ltd. All rights reserved.

Keyword :

Dehumidifying system Directive significance Evaporative cooling Evaporative cooling techniques Experimental system Future applications Indoor temperature Residential building

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GB/T 7714 He, Wen , Xilian, Luo , Yuhui, Shen et al. Research of evaporative cooling experiment in summer of residential buildings in Xi'an [C] . 2018 : 928-934 .
MLA He, Wen et al. "Research of evaporative cooling experiment in summer of residential buildings in Xi'an" . (2018) : 928-934 .
APA He, Wen , Xilian, Luo , Yuhui, Shen , Min, Zhao , Zhaolin, Gu . Research of evaporative cooling experiment in summer of residential buildings in Xi'an . (2018) : 928-934 .
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Local Fixed Pivot Quadrature Method of Moments for Solution of Population Balance Equation SCIE
期刊论文 | 2018 , 6 (11) | PROCESSES
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A local fixed pivot quadrature method of moments (LFPQMOM) is proposed for the solution of the population balance equation (PBE) for the aggregation and breakage process. First, the sectional representation for aggregation and breakage is presented. The continuous summation of the Dirac Delta function is adopted as the discrete form of the continuous particle size distribution in the local section as performed in short time Fourier transformation (STFT) and the moments in local sections are tracked successfully. Numerical simulation of benchmark test cases including aggregation, breakage, and aggregation breakage combined processes demonstrate that the new method could make good predictions for the moments along with particle size distribution without further assumption. The accuracy in the numerical results of the moments is comparable to or higher than the quadrature method of moment (QMOM) in most of the test cases. In theory, any number of moments can be tracked with the new method, but the computational expense can be relatively large due to many scalar equations that may be included.

Keyword :

breakage local fixed pivot quadrature method of moment aggregation population balance equation

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GB/T 7714 Su, Junwei , Le, Wang , Gu, Zhaolin et al. Local Fixed Pivot Quadrature Method of Moments for Solution of Population Balance Equation [J]. | PROCESSES , 2018 , 6 (11) .
MLA Su, Junwei et al. "Local Fixed Pivot Quadrature Method of Moments for Solution of Population Balance Equation" . | PROCESSES 6 . 11 (2018) .
APA Su, Junwei , Le, Wang , Gu, Zhaolin , Chen, Chungang . Local Fixed Pivot Quadrature Method of Moments for Solution of Population Balance Equation . | PROCESSES , 2018 , 6 (11) .
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Experimental study of a shell-and-tube phase change heat exchanger unit with/without circular fins EI
会议论文 | 2018 , 152 , 990-996 | 2018 Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018
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Abstract :

This study presented an experimental investigation on heat transfer performance of a shell-and-tube heat exchanger with and without circular fins. Particular attention has been paid to the effect of injection flow rate of heat transfer fluid (HTF) on the thermal performance of the heat exchanger. A purposely-designed apparatus was built for experimental observation. Results showed that the application of fins had a great effect on improving phase change heat transfer and the full charging time was significantly reduced. Injection flow rate of HTF was found to have little influence upon the performance of the heat exchanger. Copyright © 2018 Elsevier Ltd. All rights reserved.

Keyword :

Circular fins Experimental investigations Heat transfer performance Injection flow rate Phase change heat transfer Shell and tube heat exchangers Shell-and-tube Thermal Performance

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GB/T 7714 Cheng, Haonan , Luo, Tao , Yu, Jiabang et al. Experimental study of a shell-and-tube phase change heat exchanger unit with/without circular fins [C] . 2018 : 990-996 .
MLA Cheng, Haonan et al. "Experimental study of a shell-and-tube phase change heat exchanger unit with/without circular fins" . (2018) : 990-996 .
APA Cheng, Haonan , Luo, Tao , Yu, Jiabang , Yang, Xiaohu , Liu, Yanhua , Gu, Zhaolin et al. Experimental study of a shell-and-tube phase change heat exchanger unit with/without circular fins . (2018) : 990-996 .
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Analysis on hollow fiber membrane-based liquid desiccant dehumidification system EI
会议论文 | 2018 | 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018
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Humidity is one of the most influence factors of human thermal comfort, and the liquid desiccant system is an effective dehumidification mode. However, in traditional liquid desiccant system, the liquid droplet entrainment and air pollution often happens between wet air and the liquid desiccant solution because of the direct contact mode. In this study, a novel water vapor transmission mode based on the hydrophobic microporous fiber membrane is proposed. On the one hand, the path of liquid droplet entrainment is shut down due to the closed cycle of liquid desiccant in membrane absorber; on the other hand, only the water vapor can transfer across the membrane because of the micro construction and porous of membrane material, and the dehumidification effect is the major problem. Therefore, numerical simulation of hollow fiber membrane-based liquid desiccant dehumidification is set up, and different operating conditions in both wet air and liquid desiccant are changed to analyze the dehumidification effect. © ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning. All rights reserved.

Keyword :

Different operating conditions Hollow fiber membranes Human thermal comfort Liquid desiccant Liquid desiccant system Membrane absorbers Membrane material Water vapor transmission

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GB/T 7714 Wang, Zanshe , Yang, Lisheng , Hu, Juntao et al. Analysis on hollow fiber membrane-based liquid desiccant dehumidification system [C] . 2018 .
MLA Wang, Zanshe et al. "Analysis on hollow fiber membrane-based liquid desiccant dehumidification system" . (2018) .
APA Wang, Zanshe , Yang, Lisheng , Hu, Juntao , Li, Ran , Gu, Zhaolin . Analysis on hollow fiber membrane-based liquid desiccant dehumidification system . (2018) .
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Coupling Eulerian-Lagrangian method of air-particle two-phase flow with population balance equations to simulate the evolution of vehicle exhaust plume EI SCIE Scopus
期刊论文 | 2018 , 88 (3) , 117-140 | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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In this paper, we present a new numerical scheme to describe the dynamic evolution of multiphase polydisperse systems in terms of time, space, and properties by coupling the Eulerian-Lagrangian method for air-particle two-phase flow and population balance equations to describe particle property evolution due to microbehaviors (eg, aggregation, breakage, and growth). This coupling scheme was used to comprehensively simulate the two-phase flow structure, particle size spectrum, particle number, and volume concentrations. These were characterized by a high-resolution particle tracking using the Lagrangian approach and the high precision of moments of the particle size spectrum by solving the population balance equation with the quadrature method of moments. The algorithm of the coupling scheme was incorporated into the open source computational fluid dynamics software OpenFOAM to simulate the dynamic evolution of vehicle exhaust plume. The impacts of vehicle velocity, exhaust temperature, and aggregation efficiency on the distribution of auto exhaust particles in space and changes in their properties were analyzed. The results indicate that the particle number concentration, volume concentration, and average diameter of particles in the vehicle exhaust plume could be strongly affected by the plume structure and flow properties.

Keyword :

vehicle exhaust plume population balance equations Eulerian-Lagrangian method quadrature method of moments particle size spectrum multiphase polydisperse systems

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GB/T 7714 He, Yuanping , Gu, Zhaolin , Su, Junwei et al. Coupling Eulerian-Lagrangian method of air-particle two-phase flow with population balance equations to simulate the evolution of vehicle exhaust plume [J]. | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS , 2018 , 88 (3) : 117-140 .
MLA He, Yuanping et al. "Coupling Eulerian-Lagrangian method of air-particle two-phase flow with population balance equations to simulate the evolution of vehicle exhaust plume" . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS 88 . 3 (2018) : 117-140 .
APA He, Yuanping , Gu, Zhaolin , Su, Junwei , Chen, Chungang , Zhang, Mingxu , Zhang, Liyuan et al. Coupling Eulerian-Lagrangian method of air-particle two-phase flow with population balance equations to simulate the evolution of vehicle exhaust plume . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS , 2018 , 88 (3) , 117-140 .
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Lattice Boltzmann method for conjugated heat and mass transfer with general interfacial conditions EI Scopus SCIE
期刊论文 | 2018 , 98 (4) | Physical Review E
WoS CC Cited Count: 1
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A general interfacial treatment for the transport process in multicomponent systems governed by the convection-diffusion equation, together with conjugated interfaces where continuity or discontinuity interfacial conditions with regard to the physical scalar and its flux exist, is developed using the lattice Boltzmann method (LBM) with a multiple-relaxation-time collision operator. Factors accounting for interfacial jumps at conjugated interfaces typically include the difference in solubility, porosity, and transport properties, and the interfacial transport resistance. Difficulties in satisfying the discontinuity conditions, where continuity conditions are inherent in the conventional LBM, are overcome based on a second-order accurate treatment for both Dirichlet and Neumann boundary conditions. As a result, the unknown populations at the interface are obtained with a combination of the existing postcollision populations and the defined interfacial jumps without finite-difference approximations, thereby enabling the interfacial requirements precisely. Since the present treatment considers local intersected link fractions of the interface, it can be applied for curved interfaces naturally. As for straight interfaces located at the midpoints of the nodes, the present treatment can be significantly simplified with only two current nodes required. Validation work on the present treatment are performed with four specific problems, including the steady and unsteady convection diffusion in a fluid-fluid channel, steady convection diffusion in a fluid-solid system, steady and unsteady pure conduction in a composite slab, and steady pure conduction in an annulus. Such an interfacial scheme is finally applied to the conjugated mass transfer in a heterogonous medium, highlighting its practicability in complex systems with complicated interfacial conditions. In addition, detailed error analysis on interior nodes, interfacial values, and interfacial fluxes shows that our model is second-order accurate in space for straight interfaces regardless of various interfacial conditions, indicating no artificial disturbance is introduced to the model. While for curved interface, only superlinear and first-order accuracies are obtained for the interior nodes and the interfacial values or fluxes, respectively. Discussions on the degradation of the accuracy are presented. Note that the present interfacial treatment is mainly focused on two-dimensional problems, extensions of the model to be three-dimensional are straightforward. © 2018 American Physical Society.

Keyword :

Convection-diffusion equations Dirichlet and Neumann boundary conditions Discontinuity conditions Finite difference approximations Lattice Boltzmann method Lattice boltzmann methods (LBM) Multiple-relaxation time Unsteady convection diffusions

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GB/T 7714 Mu, Yu-Tong , Gu, Zhao-Lin , He, Pu et al. Lattice Boltzmann method for conjugated heat and mass transfer with general interfacial conditions [J]. | Physical Review E , 2018 , 98 (4) .
MLA Mu, Yu-Tong et al. "Lattice Boltzmann method for conjugated heat and mass transfer with general interfacial conditions" . | Physical Review E 98 . 4 (2018) .
APA Mu, Yu-Tong , Gu, Zhao-Lin , He, Pu , Tao, Wen-Quan . Lattice Boltzmann method for conjugated heat and mass transfer with general interfacial conditions . | Physical Review E , 2018 , 98 (4) .
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