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Simulation and evaluation study of atmospheric aerosol nonsphericity as a function of particle size

Particuology 2024年第7期90卷 281-291页

作者： qianjun mao Xin Nie School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China College of New Energy and Materials Northeast Petroleum UniversityDaqing163318China

Aerosol nonsphericity causes great uncertainty in radiative forcing assessments and climate *** considerable studies have attempted to quantify this uncertainty,the relationship between aerosol nonsphericity and particle size is usually not considered,thus reducing the accuracy of the *** this study,a coupled inversion algorithm combining an improved stochastic particle swarm optimization algorithm and angular light scattering is used for the nonparametric estimation of aerosol nonsphericity variation with particle size,and the optimal sample selection method is employed to screen the *** on the verification of inversion accuracy,the variation of aerosol aspect ratio with particle size based on the ellipsoidal model in global regions has been obtained from Aerosol Robotic Network(AERONET)data,and the effect of nonsphericity on radiative forcing and dry deposition has been *** results show that the aspect ratio increases with particle size in all regions,with the maximum ranging from 1.4 to 1.8 in the desert,reflecting the differences in aerosol composition at different particle *** radiation calculations,considering aerosol nonsphericity makes the aerosol cooling effect weaker and surface radiative fluxes increase,but hardly changes the aerosol absorption,with maximum differences of 9.22%and 22.12%at the bottom and top of the atmosphere,***,the differences in radiative forcing between aspect ratios as a function of particle size and not varying with particle size are not significant,averaging less than 2%.Besides,the aspect ratio not varying with particle size underestimates the deposition velocity of small particles and overestimates that of large particles compared to that as a function of particle size,with maximum differences of 7%and 4%,respectively.

关键词： Aerosol nonsphericity Inversion Aspect ratio Radiative forcing Dry deposition velocity

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Heat Storage Performance of PCM in a Novel Vertical Pointer-Shaped Finned Latent Heat Tank

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Journal of Thermal Science 2024年第2期33卷 422-434页

作者： mao qianjun ZHU Yuanyuan LI Tao School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China

The heat storage performance of latent heat storage systems is not good due to the poor thermal conductivity of phase change *** this paper,a new type of pointer-shaped fins combining rectangular and triangular fins has been employed to numerically simulate the melting process in the heat storage tank,and the fin geometry parameter effects on heat storage performance have been *** results indicate that compared with the bare tube and the rectangular finned tank,the melting time of the phase change material in the pointer-shaped finned tank is reduced by 64.2%and 15.1%,*** closer the tip of the triangular fin is to the hot wall,the better the heat transfer *** optimal height of the triangular fin is about 8 *** the number of fins from 4 to 6 and from 6 to 8 reduces the melting time by 16.0%and 16.7%***,increasing the number of fins from 8 to 10 only reduces the melting time by 8.4%.When the fin dimensionless length is increased from 0.3 to 0.5 and from 0.5 to 0.7,the melting time is shortened by 17.5%and 13.0%.But the melting time is only reduced by 2.9%when the dimensionless fin length is increased from 0.7 to *** optimising the design of the thermal storage system,the results can provide a reference value.

关键词： thermal energy storage phase change material pointer-shaped fins heat storage performance

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Numerical analysis on phase change material melting process of a conical spiral tube energy storage tank

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Science China Technological Sciences 2024年

作者： ZHAO Yuan mao qianjun School of Urban Construction Wuhan University of Science and Technology

Spiral tube heat exchangers have been widely used in phase change energy storage due to the compact structure and large heat transfer area. Therefore, this study numerically analyzes the effects of spiral tube diameter, number of rotations, and unsteady heat source on the melting process in conical spiral tube energy storage tanks using Fluent software. The results indicate that when the tube diameter is increased from 8 to 11 mm and the number of rotations is increased from 5 to 8, the melting time is extended by 15.74% and 17.83%, respectively. The energy storage capacity increases by 0.64% and 1.83%, respectively. The average energy storage rate decreases by 13.05% and 13.58%, respectively. Furthermore, the sinusoidal wave heat source with small heat source periods has little effect on the melting process, while large heat source periods can significantly accelerate the melting. And the influence of amplitudes on the thermal storage performance under large heat source periods is more *** the heat source period is increased from 2 to 160 min and the amplitude is increased from 5 to 20 K, the melting time is reduced by 24.50% and 17.20%, respectively. The total energy storage capacity decreases by 6.36% and increases by 1.62%,respectively. The average energy storage rate increases by 24.03% and 22.74%, respectively. The study provides guidance for the performance optimization of spiral tube phase change systems.

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核壳结构粒子与群粒子光学散射特性研究

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激光与光电子学进展 2024年第5期61卷 514-521页

作者：毛前军杨开雁武汉科技大学城市建设学院湖北武汉430065

为探究近红外波段下气溶胶粒子的散射特性,基于离散偶极子近似法,对黑碳和硫酸盐气溶胶内混合核壳结构粒子及同种气溶胶粒子的2种假设结构的光学散射特性进行研究。编译构建以黑碳为核、硫酸铵为壳的核壳结构粒子模型,模拟计算特定入射... 详细信息

为探究近红外波段下气溶胶粒子的散射特性,基于离散偶极子近似法,对黑碳和硫酸盐气溶胶内混合核壳结构粒子及同种气溶胶粒子的2种假设结构的光学散射特性进行研究。编译构建以黑碳为核、硫酸铵为壳的核壳结构粒子模型,模拟计算特定入射方向的入射波长(875、1020、1640、2000 nm)下粒子的消光效率因子、散射效率因子、吸收效率因子、不对称因子及单次散射反照率随有效粒径的变化。数值计算结果表明:在同一入射波长下,随着有效粒径的增大,单核核壳粒子、二核团簇粒子、三核团簇粒子的消光、散射、吸收效率因子主要呈先增后减趋势,且3种粒子的散射、消光效率因子相差不超过10%。随着核粒子数增加,粒子结构半径增大,效率因子峰值后移。在4个波长下,多核团簇粒子的不对称因子平均比单核核壳粒子大0.1777、0.1960、0.2900和0.3131,而2种多核粒子的不对称因子平均仅相差0.096。在有效粒径相同的情况下,单核核壳粒子的单次散射反照率基本高于多核粒子,波长越大差异越明显。该研究结果可对复杂大气环境下气溶胶粒子的光学散射特性、污染物及气候效应监测等领域的分析提供一定的参考价值。

关键词：红外波段气溶胶粒子核壳粒子离散偶极子近似法散射与吸收

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Comparative investigation on the heat transfer performance of an energy storage system with a spiral tube and straight tube:An experimental approach

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Science China(Technological Sciences) 2023年第1期66卷 71-85页

作者： mao qianjun CAO Yan LI Tao School of Urban Construction Wuhan University of Science and TechnologyWuhan 430065China

Latent heat thermal energy storage systems can effectively fill the gap between energy storage and application, and phase-change materials(PCMs) are crucial media for storing thermal energy. Therefore, how to maximize the utilization efficiency of PCMs has attracted widespread attention. In this study, the thermal behavior of two thermal storage units employing a spiral tube and straight tube as heat transfer tubes was experimentally researched and comprehensively compared. Stefan numbers were used to investigate the impact of the heat transfer fluid temperature on the PCM melting process. The temperature distribution of PCMs,temporal evolution of the melting front, and temperature variations of measurement points in both tanks were compared. The average temperature and energy storage of PCMs were calculated to evaluate the thermal performance of different configurations. The results indicate that compared to cylinder B(with a straight tube), the energy storage in cylinder A(with a spiral tube)increased by 78.8%, 38.5%, and 19.6% at Stefan numbers of 1.08, 1.28, and 1.48, respectively. Moreover, the increase in the Stefan number simultaneously ascended the average temperature and energy storage of PCMs in containers A and B, causing the shortening of the melting time. When the Stefan number was increased from 1.28 to 1.48, the storage capacity was raised from3233.18 to 3463.8 k J, and the total melting time was decreased by 34.2% from 547.5 to 360 min after the PCM was loaded in cylinder A. The research results lay a certain foundation for a deeper study of enhanced heat transfer in spiral tubes.

关键词： thermal energy storage visualization experiment PCM spiral tube straight tube

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Energy Storage Performance of a PCM in the Solar Storage Tank

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Journal of Thermal Science 2019年第2期28卷 195-203页

作者： mao qianjun CHEN Hongzhang YANG Yizhi School of Urban Construction Wuhan University of Science and Technology

High-temperature solar thermal power station with solar energy storage is one of the effective ways to solve energy shortage and environmental pollution. The heat storage characteristics of phase change materials in solar energy storage tanks directly affect the performance of the system and its future promotion and utilization. Based on the knowledge of heat transfer, fluid mechanics and engineering thermodynamics, this paper uses MATLAB software to compile the dynamic heat storage characteristics calculation program of phase change materials in energy storage tanks, and verify the results. This paper analyzes the phase change heat storage process with three PCM initial temperatures and three HTF speeds. The results show that when the initial temperature of the PCM changes from 185°C to 210°C, the latent heat storage heat increases by 21.8%, and the total heat storage decreases. Increasing the HTF speed from 1.8 m/s to 2.2 m/s, the melting time was reduced from 414 minutes to 390 minutes, and the total heat storage and sensible heat storage were also increased. The results also show that changing the initial temperature of the PCM and the flow rate of the HTF will change the thermal storage performance of the system. The research has certain reference significance for mastering the basic principle of high temperature solar thermal power generation system and promoting the application of the system.

关键词： solar phase change materials energy storage performance sensible heat latent heat

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Numerical and Experimental Investigation on Heat Transfer Performance of a Solar Single Storage Tank

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Journal of Thermal Science 2021年第5期30卷 1596-1606页

作者： mao qianjun LI Ying ZHANG Yamei ZHANG Chunzhi School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China

The single-tank latent heat thermal energy storage(LHTES)of solar energy mainly consists of two modules:the first one is the phase change material(PCM)module heated by solar energy;the second is a module of heat transfer between melted PCM and the user’s low-temperature *** paper mainly focuses on the former *** investigate the heat transfer performance of the paraffin-based solar single storage tank and find a more suitable experimental configuration,as basic research work,we established a single-tank thermal storage platform and then conducted a numerical simulation on the heat transfer process with *** result of numerical simulation shows that the test situation was basically reflected and the data agreed well with the experiment *** numerical simulation analysis is accurate and the method is *** obtain the heat transfer performance of paraffin in a single tank and strengthen heat transfer,the aspect ratio,the melting temperature of paraffin,and the heating power of the electric heater were analyzed based on *** results show that the heat transfer gets more uniform when the aspect ratio is *** results in an increase in the liquid fraction of 61.83%to 76.47%one hour after heating when the aspect ratio of the tank reduced from 2.8 to *** higher the melting temperature of paraffin,the longer it takes for PCM to reach a stable *** the curvature of liquid heating is greater than that of solid heating at the bottom *** the constant total work,the heating power has little effect on the heat transfer performance of the *** study will provide some reference value for the optimization design of single-tank LHTES systems in the future.

关键词： LHTES single tank PCM numerical simulation

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Performance of MODIS aerosol products at various timescales and in different pollution conditions over eastern Asia

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Science China(Technological Sciences) 2021年第4期64卷 774-784页

作者： mao qianjun HUANG ChunLin ZHANG HengXing CHEN QiXiang YUAN Yuan School of Urban Construction Wuhan University of Science and TechnologyWuhan 430065China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150001China

High-quality aerosol optical depth(AOD)data derived from MODIS is widely used in studying spatiotemporal trends of fine particulate matter(PM2.5)concentrations in eastern ***,the differences of MODIS-AOD(3/10 km DT;10 km DB)under four pollution situations(No-Po;Sl-Po;Mo-Po;Se-Po)are rarely *** this study,the MODIS-AOD and AODDifference spatial distributions from 2008 to 2017 are analyzed through annual/seasonal mean AOD maps generated at 0.1°×0.1°*** MODIS-AOD performances are validated using AERONET AOD data for various pollution situations and aerosol *** validations indicate that the 10-km DB algorithm provides the best performance,followed by 3-km DTand 10 km *** DB algorithm can provide spatially continuous AOD data for all seasons,whereas the DT algorithm often fails to yield valid data during *** validations under different pollution conditions illustrate that severe pollution significantly affects the validity of data obtained by the DB ***,the accuracy of DT-derived AOD data is robust against *** the same pollution conditions,the correlation coefficient of the DB algorithm is smaller than that of the DT *** quantity of valid data in the DB product is higher than those in DT products for all pollution conditions,especially under Se-Po.

关键词： aerosol optical depth MODIS DT algorithm DB algorithm pollution conditions

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太阳能光热光电技术在高校宿舍的对比研究

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建筑节能（中英文） 2024年第6期52卷 16-22,79页

作者：张春枝吴宇红李涛雷赢昌毛前军武汉科技大学城市建设学院武汉430065

针对夏热冬冷地区某高校宿舍用能特征,基于太阳能的两种利用方式分别设计了太阳能光热供能系统和太阳能光电供能系统。利用TRNSYS仿真软件模拟两种供能系统的运行特性,对比了两种系统的组件性能、经济性及减排量。结果表明:除假期时间外... 详细信息

针对夏热冬冷地区某高校宿舍用能特征,基于太阳能的两种利用方式分别设计了太阳能光热供能系统和太阳能光电供能系统。利用TRNSYS仿真软件模拟两种供能系统的运行特性,对比了两种系统的组件性能、经济性及减排量。结果表明:除假期时间外,太阳能集热单元的集热效率保持在40%左右,年太阳能保证率可达58%;并网光伏发电单元全年发电量为311 394 kW·h,发电量自用率达到70.5%。太阳能光电供能系统的年能耗费用较光热供能系统节省11万元,费用年值减少4.9万元,年碳排放量降低166 t。对光伏安装面积进行优化后可知,光伏安装面积每增加52 m^(2),光伏供能系统费用年值减少2111元。研究结果可为高校宿舍建筑选择适宜的太阳能利用形式提供参考和依据。

关键词：高校宿舍多能互补太阳能空气源热泵节能经济性

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典型雾霾粒子及团簇的散射吸湿增长特性

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光学学报 2020年第24期40卷 178-186页

作者：毛前军王莉武汉科技大学城市建设学院湖北武汉430065

为探究雾霾粒子吸湿性引起的散射吸湿增长特性,基于雾霾粒子湿度增长模型,利用Mie散射理论和多球T矩阵计算方法,详细研究了硫酸、硫酸铵、沙尘、硝酸铵以及碳质气溶胶5种典型雾霾粒子及其团簇在入射波长为532 nm、相对湿度在60%~95%范... 详细信息

为探究雾霾粒子吸湿性引起的散射吸湿增长特性,基于雾霾粒子湿度增长模型,利用Mie散射理论和多球T矩阵计算方法,详细研究了硫酸、硫酸铵、沙尘、硝酸铵以及碳质气溶胶5种典型雾霾粒子及其团簇在入射波长为532 nm、相对湿度在60%~95%范围内的散射吸湿增长特性。研究结果表明:对单一雾霾粒子,硫酸、硫酸铵以及硝酸铵这类二次水溶性无机粒子及其团簇的散射吸湿增长较突出,沙尘较为平缓,而碳质气溶胶则呈现抑制作用,同时,小粒径粒子的散射吸湿增长因子呈指数增长,而大粒径粒子则呈波动、负增长趋势;对于雾霾粒子的团簇,散射吸湿增长因子曲线整体增幅减小,粒子团簇的体积分数对散射吸湿的影响明显,随着体积分数的增加,散射吸湿增长因子曲线的波动频率增大,同时振幅减小,但整体呈现的吸湿增长还是由团簇粒子的粒径范围与成分决定,其中团簇粒径范围影响较大。这为探究雾霾粒子散射吸湿增长特性和研究大气污染提供了理论支持。

关键词：散射雾霾粒子 Mie散射多球T矩阵散射吸湿增长因子

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