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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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Abstract :

© 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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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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Abstract :

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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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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Abstract :

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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Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition EI SCIE Scopus
期刊论文 | 2018 , 18 (3) , 780-789 | AEROSOL AND AIR QUALITY RESEARCH
SCOPUS Cited Count: 3
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Abstract :

Observation data show that natural wind has a characteristic of regular time-variation in speed and direction. However, the time-varying inflow conditions are usually simplified as a constant wind profile in simulations on airflow and pollutant dispersion in urban street canyons and/or building cluster. The study on characteristics of urban canopy layer (UCL) flow under time-varying inflow conditions should be further contribute to the understanding of pollutant and energy transport processes in the urban atmospheric environment. In the current work, typical studies on air flow and pollutant dispersion in urban street canyons and building array are reviewed. The time-varying upstream inflows could commonly enhance the transportation of pollutant and energy in actual UCL. Studies have revealed that the variation of natural inflow conditions could be one of the primary factors that influencing the transport efficiency of pollutant in urban street canyons. Perspectives on methods in performing the time-varying inflow conditions are provided as well. Gradual and/or stepped variation of wind data would be expected in numerical simulations.

Keyword :

Urban street canyon Time-varying inflow Gusty wind Natural wind condition Pollutant dispersion

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GB/T 7714 Zhang, Yunwei , Gu, Zhaolin , Yu, Chuck Wah . Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition [J]. | AEROSOL AND AIR QUALITY RESEARCH , 2018 , 18 (3) : 780-789 .
MLA Zhang, Yunwei et al. "Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition" . | AEROSOL AND AIR QUALITY RESEARCH 18 . 3 (2018) : 780-789 .
APA Zhang, Yunwei , Gu, Zhaolin , Yu, Chuck Wah . Review on Numerical Simulation of Airflow and Pollutant Dispersion in Urban Street Canyons under Natural Background Wind Condition . | AEROSOL AND AIR QUALITY RESEARCH , 2018 , 18 (3) , 780-789 .
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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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Advances in Pore-Scale Simulation of Oil Reservoirs EI SCIE Scopus
期刊论文 | 2018 , 11 (5) | ENERGIES
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At the high water cut stage, the residual oil in a reservoir becomes complex and dispersed. Moreover, it is challenging to achieve good predictions of the movement of oil and water in a reservoir according to the macroscopic models based on the statistic parameters of this scenario. However, pore-scale simulation technology based on directly tracking the interaction among different phases can make an accurate prediction of the fluid distribution in the pore space, which is highly important in the improvement of the recovery rate. In this work, pore-scale simulation methods, including the pore network model, lattice Boltzmann method, Navier-Stokes equation-based interface tracking methods, and smoothed particle hydrodynamics, and relevant technologies are summarized. The principles, advantages, and disadvantages, as well as the degree of difficulty in the implementation are analyzed and compared. Problems in the current simulation technologies, micro sub-models, and applications in physicochemical percolation are also discussed. Finally, potential developments and prospects in this field are summarized.

Keyword :

lattice Boltzmann method smoothed particle hydrodynamics pore-scale simulation volume of fluid pore network model

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GB/T 7714 Su, Junwei , Wang, Le , Gu, Zhaolin et al. Advances in Pore-Scale Simulation of Oil Reservoirs [J]. | ENERGIES , 2018 , 11 (5) .
MLA Su, Junwei et al. "Advances in Pore-Scale Simulation of Oil Reservoirs" . | ENERGIES 11 . 5 (2018) .
APA Su, Junwei , Wang, Le , Gu, Zhaolin , Zhang, Yunwei , Chen, Chungang . Advances in Pore-Scale Simulation of Oil Reservoirs . | ENERGIES , 2018 , 11 (5) .
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Experimental study of a local ventilation strategy to protect semi-exposed relics in a site museum EI SCIE Scopus
期刊论文 | 2018 , 159 , 558-571 | ENERGY AND BUILDINGS
SCOPUS Cited Count: 2
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Indoor environmental controls are critical considerations when preserving artifacts in museums. Controlling the indoor environment of site museum buildings with large space layout typically consumes large amounts of energy. Most of the energy load needed to preserve relics is dissipated throughout the non-occupied space, because the environments that contain the relics occupy relatively little space compared to the entire exhibition hall. In this study, an energy efficient local ventilation system was proposed to independently control the environment of a funerary pit, which was preserved within a museum separate from the large exhibition hall. An experimental hall, which consists of a funerary pit and an experimental local ventilation system, was built to simulate a site museum building. Experiments were conducted to investigate the system's performance and to validate its ability to preserve historical terracotta figurines in their semi-exposed pits within the exhibition hall. The study evaluated the stability of the conservation environment and the system's energy usage by assessing the effects of the ventilation rate. The experimental results showed that the local ventilation system provides an energy-saving strategy supporting the environmental control of the funerary pit. The LV system significantly decreased temperature fluctuations in the funerary pit and temperature differences across semi-exposed relics. The system could be used to control the local preservation environment of the funerary pit separately from a large space exhibition hall. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Site museum Relic preservation Local environmental control Energy saving Local ventilation system

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GB/T 7714 Luo, Xilian , Gu, Zhaolin , Tian, Wei et al. Experimental study of a local ventilation strategy to protect semi-exposed relics in a site museum [J]. | ENERGY AND BUILDINGS , 2018 , 159 : 558-571 .
MLA Luo, Xilian et al. "Experimental study of a local ventilation strategy to protect semi-exposed relics in a site museum" . | ENERGY AND BUILDINGS 159 (2018) : 558-571 .
APA Luo, Xilian , Gu, Zhaolin , Tian, Wei , Xia, Yin , Ma, Tao . Experimental study of a local ventilation strategy to protect semi-exposed relics in a site museum . | ENERGY AND BUILDINGS , 2018 , 159 , 558-571 .
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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
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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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