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Artigos de revistas sobre o tema "Resolved particles"

Autor: Grafiati

Publicado: 1 de fevereiro de 2025

Última modificação: 31 de julho de 2025

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1

Hameete, J., M. S. Abdallah, L. C. Thijs, et al. "Particle-resolved hyperspectral pyrometry of metal particles." Combustion and Flame 264 (June 2024): 113435. http://dx.doi.org/10.1016/j.combustflame.2024.113435.

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2

Kannosto, J., M. Lemmetty, A. Virtanen, et al. "Mode resolved density of atmospheric aerosol particles." Atmospheric Chemistry and Physics Discussions 8, no. 2 (2008): 7263–88. http://dx.doi.org/10.5194/acpd-8-7263-2008.

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Abstract. In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density information for each mode in atmospheric fine particle population: the density values for nucleation, Aitken, and accumulation mode particles are presented. The experimental data was gained during 2 May 2005–19 May 2005 at the boreal forest measurement station "SMEAR II" in Hyytiälä, southern Finland. The density values for accumulation mode varied from 1.1 to 2 g/cm3 (average 1.5 g/cm3) and for

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3

Kannosto, J., A. Virtanen, M. Lemmetty, et al. "Mode resolved density of atmospheric aerosol particles." Atmospheric Chemistry and Physics 8, no. 17 (2008): 5327–37. http://dx.doi.org/10.5194/acp-8-5327-2008.

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Abstract. In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density information for each mode in atmospheric fine particle population: the density values for nucleation, Aitken, and accumulation mode particles are presented. The experimental data was gained during 2 May 2005–19 May 2005 at the boreal forest measurement station "SMEAR II" in Hyytiälä, Southern Finland. The density values for accumulation mode varied from 1.1 to 2 g/cm3 (average 1.5 g/cm3) and for

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4

Song, Yao, Jing Wei, Wenlong Zhao, et al. "Measurement report: Size-resolved particle effective density measured by an AAC-SMPS and implications for chemical composition." Atmospheric Chemistry and Physics 25, no. 9 (2025): 4755–66. https://doi.org/10.5194/acp-25-4755-2025.

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Abstract. The effective density (ρeff) is closely associated with the aging process and can serve as a tracer of chemical composition. Recently, studies investigating the effect of particle size on density have been limited. In this study, size-resolved ρeff was characterized using a tandem aerodynamic aerosol classifier (AAC) and scanning mobility particle sizer (SMPS) system during 1 month of observations in Hangzhou. The results indicate that the ρeff values of the particles exhibit a unimodal distribution, with average values ranging from 1.47 to 1.63 g cm−3, increasing as the particle dia

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5

Kakavas, Stylianos, David Patoulias, Maria Zakoura, Athanasios Nenes, and Spyros N. Pandis. "Size-resolved aerosol pH over Europe during summer." Atmospheric Chemistry and Physics 21, no. 2 (2021): 799–811. http://dx.doi.org/10.5194/acp-21-799-2021.

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Abstract. The dependence of aerosol acidity on particle size, location, and altitude over Europe during a summertime period is investigated using the hybrid version of aerosol dynamics in the chemical transport model PMCAMx. The pH changes more with particle size in northern and southern Europe owing to the enhanced presence of non-volatile cations (Na, Ca, K, Mg) in the larger particles. Differences of up to 1–4 pH units are predicted between sub- and supermicron particles, while the average pH of PM1−2.5 can be as much as 1 unit higher than that of PM1. Most aerosol water over continental Eu

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6

Tien, Wei Hsin, and Zi-Ling Lin. "Single-Frame Lagrangian Tracking Of 3-D Acoustic Streaming Flows Using Digital Defocusing Micro Particle Streak Velocimetry." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–12. http://dx.doi.org/10.55037/lxlaser.21st.191.

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In this study, a single-frame particle streak velocimetry technique is applied to the classic DDPIV(Digital Defocusing Particle Image Velocimetry) concept to achieve a single-frame 3-D Lagrangian tracking of particles in microscopic flows. The shortcoming of images suffering low signal to noise ratio due to pinholes can be avoided. With the streak resolving algorithm, it allows extended exposure time when streak images are taken, and the single-frame approach also eliminates the need for high-cost and complicated synchronization hardware for double-pulse frame-straddling light sources. For eac

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7

Kontkanen, Jenni, Chenjuan Deng, Yueyun Fu, et al. "Size-resolved particle number emissions in Beijing determined from measured particle size distributions." Atmospheric Chemistry and Physics 20, no. 19 (2020): 11329–48. http://dx.doi.org/10.5194/acp-20-11329-2020.

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Abstract. The climate and air quality effects of aerosol particles depend on the number and size of the particles. In urban environments, a large fraction of aerosol particles originates from anthropogenic emissions. To evaluate the effects of different pollution sources on air quality, knowledge of size distributions of particle number emissions is needed. Here we introduce a novel method for determining size-resolved particle number emissions, based on measured particle size distributions. We apply our method to data measured in Beijing, China, to determine the number size distribution of em

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8

Yu, X. Y., J. P. Cowin, M. J. Iedema, and H. Ali. "Fast time-resolved aerosol collector: proof of concept." Atmospheric Measurement Techniques Discussions 3, no. 3 (2010): 2515–34. http://dx.doi.org/10.5194/amtd-3-2515-2010.

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Abstract. Atmospheric particles can be collected in the field on substrates for subsequent laboratory analysis via chemically sensitive single particle methods such as scanning electron microscopy with energy dispersive x-ray analysis. With moving substrates time resolution of seconds to minutes can be achieved. In this paper, we demonstrate how to increase the time resolution when collecting particles on a substrate to a few milliseconds to provide real-time information. Our fast time-resolved aerosol collector ("Fast-TRAC") microscopically observes the particle collection on a substrate and

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9

Yu, X. Y., J. P. Cowin, M. J. Iedema, and H. Ali. "Fast time-resolved aerosol collector: proof of concept." Atmospheric Measurement Techniques 3, no. 5 (2010): 1377–84. http://dx.doi.org/10.5194/amt-3-1377-2010.

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Abstract. Atmospheric particles can be collected in the field on substrates for subsequent laboratory analysis via chemically sensitive single particle methods such as scanning electron microscopy with energy dispersive x-ray analysis. With moving substrates time resolution of seconds to minutes can be achieved. In this paper, we demonstrate how to increase the time resolution when collecting particles on a substrate to a few milliseconds to provide real-time information. Our fast time-resolved aerosol collector ("Fast-TRAC") microscopically observes the particle collection on a substrate and

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10

Guo, S., M. Hu, Z. B. Wang, J. Slanina, and Y. L. Zhao. "Size-resolved aerosol water-soluble ionic compositions in the summer of Beijing: implication of regional secondary formation." Atmospheric Chemistry and Physics 10, no. 3 (2010): 947–59. http://dx.doi.org/10.5194/acp-10-947-2010.

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Abstract. To characterize aerosol pollution in Beijing, size-resolved aerosols were collected by MOUDIs during CAREBEIJING-2006 field campaign at Peking University (urban site) and Yufa (upwind rural site). Fine particle concentrations (PM1.8 by MOUDI) were 99.8±77.4 μg/m3 and 78.2±58.4 μg/m3, with PM1.8/PM10 ratios of 0.64±0.08 and 0.76±0.08 at PKU and Yufa, respectively, and secondary compounds accounted for more than 50% in fine particles. PMF model analysis was used to resolve the particle modes. Three modes were resolved at Yufa, representing condensation, droplet and coarse mode. However

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11

Lu, Senlin, Teng Ma, Lu Zhang, et al. "Relationships between Mass Level of Allergenic Platanus acerifolia Protein 3 (Pla a3) and Redox Trace Elements in the Size-Resolved Particles in Shanghai Atmosphere." Atmosphere 13, no. 10 (2022): 1541. http://dx.doi.org/10.3390/atmos13101541.

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Allergenic pollen protein can be released from pollen grains and suspended in the air to cause allergenic reactions. However, the allergenic protein and its relationship with redox trace elements in ambient size-resolved particles has not been reported. Ambient size-resolved particles in Shanghai’s atmosphere were sampled during the Platanus pollen season in the spring season of 2017. Planatus pollen protein 3 (Pla a3) and redox trace elements in the ambient particles were investigated and their relationship was analyzed. Our data demonstrated that the mass level of the Pla a3 in the size-reso

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12

Vreman, A. W. "Particle-resolved direct numerical simulation of homogeneous isotropic turbulence modified by small fixed spheres." Journal of Fluid Mechanics 796 (April 28, 2016): 40–85. http://dx.doi.org/10.1017/jfm.2016.228.

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A statistically stationary homogeneous isotropic turbulent flow modified by 64 small fixed non-Stokesian spherical particles is considered. The particle diameter is approximately twice the Kolmogorov length scale, while the particle volume fraction is 0.001. The Taylor Reynolds number of the corresponding unladen flow is 32. The particle-laden flow has been obtained by a direct numerical simulation based on a discretization of the incompressible Navier–Stokes equations on 64 spherical grids overset on a Cartesian grid. The global (space- and time-averaged) turbulence kinetic energy is attenuat

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13

Vowinckel, B., J. Withers, Paolo Luzzatto-Fegiz, and E. Meiburg. "Settling of cohesive sediment: particle-resolved simulations." Journal of Fluid Mechanics 858 (October 31, 2018): 5–44. http://dx.doi.org/10.1017/jfm.2018.757.

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We develop a physical and computational model for performing fully coupled, grain-resolved direct numerical simulations of cohesive sediment, based on the immersed boundary method. The model distributes the cohesive forces over a thin shell surrounding each particle, thereby allowing for the spatial and temporal resolution of the cohesive forces during particle–particle interactions. The influence of the cohesive forces is captured by a single dimensionless parameter in the form of a cohesion number, which represents the ratio of cohesive and gravitational forces acting on a particle. We test

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14

Alonso-Blanco, Elisabeth, Francisco J. Gómez-Moreno, and Begoña Artíñano. "Size-resolved hygroscopicity of ambient submicron particles in a suburban atmosphere." Atmospheric Environment 213 (May 30, 2019): 349–58. https://doi.org/10.1016/j.atmosenv.2019.05.065.

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This work presents a comprehensive study of the size-resolved particle hygroscopicity measurements in a suburbanambient in Southern Europe (Madrid). Measurements were obtained by an H-TDMA instrument during a16-month period for the size particles of 50, 80, 110, 190 and 265 nm. The annual, seasonal and daily patternswere investigated with the aim of characterizing the hygroscopic growth of ambient aerosol particles and theirmixing state in the atmosphere. Simultaneously, the particle number size distributions, gaseous species (SO2,NO, NO2, and O3) and meteorological factors were measured and a

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15

Chen, Jingchuan, Zhijun Wu, Jie Chen, et al. "Size-resolved atmospheric ice-nucleating particles during East Asian dust events." Atmospheric Chemistry and Physics 21, no. 5 (2021): 3491–506. http://dx.doi.org/10.5194/acp-21-3491-2021.

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Abstract. Asian dust is an important source of atmospheric ice-nucleating particles (INPs). However, the freezing activity of airborne Asian dust, especially its sensitivity to particle size, is poorly understood. In this study we report the first INP measurement of size-resolved airborne mineral dust collected during East Asian dust events. The measured total INP concentrations in the immersion mode ranged from 10−2 to 102 L−1 in dust events at temperatures between −25 and −5 ∘C. The average contributions of heat-sensitive INPs at three temperatures, −10, −15, and −20 ∘C, were 81±12 %, 70±15

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16

Guo, S., M. Hu, Z. B. Wang, J. Slanina, and Y. L. Zhao. "Size-resolved aerosol water-soluble ionic compositions in the summer of Beijing: implication of regional secondary formation." Atmospheric Chemistry and Physics Discussions 9, no. 6 (2009): 23955–86. http://dx.doi.org/10.5194/acpd-9-23955-2009.

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Abstract. To characterize aerosol pollution in Beijing, size-resolved aerosols were collected by MOUDIs during CAREBEIJING-2006 field campaign at Peking University (urban site) and Yufa (upwind rural site). Fine particle concentrations (PM1.8 by MOUDI) were 99.8±77.4 μg/m3 and 78.2±58.4 μg/m3, with PM1.8/PM10 ratios of 0.64±0.08 and 0.76±0.08 at PKU and Yufa, respectively, and secondary compounds accounted for more than 50% in fine particles. PMF model was used to resolve the particle modes. Three modes were resolved at Yufa, representing condensation, droplet and coarse mode. However, one mor

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17

Wang, Junwen, Jichao Lin, Jianchun Wang, Yongwei Mao, Songying Chen, and Guichao Wang. "Comparative Study of Particle-Resolved and Point-Particle Simulations of Particle–Bubble Collisions in Homogeneous Isotropic Turbulence." Minerals 15, no. 4 (2025): 338. https://doi.org/10.3390/min15040338.

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Bubble–particle collisions in turbulent flows are fundamental to flotation processes, yet their complex dynamics remain challenging to characterize accurately. In this study, a comparison study of a particle–bubble collision system in homogeneous isotropic turbulence was performed using the particle-resolved method and point-particle method. Direct numerical simulations of turbulent flows were achieved using the lattice Boltzmann method (LBM). The effects of hydrodynamics on the collision particles were compared between Lagrangian tracking and directly resolving the disturbance flows around fi

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18

Rademacher, Markus, Jonathan Gosling, Antonio Pontin, et al. "Measurement of single nanoparticle anisotropy by laser induced optical alignment and Rayleigh scattering for determining particle morphology." Applied Physics Letters 121, no. 22 (2022): 221102. http://dx.doi.org/10.1063/5.0128606.

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We demonstrate the measurement of nanoparticle anisotropy by angularly resolved Rayleigh scattering of single optical levitated particles that are oriented in space via the trapping light in vacuum. This technique is applied to a range of particle geometries from perfect spherical nanodroplets to octahedral nanocrystals. We show that this method can resolve shape differences down to a few nanometers and be applied in both low-damping environments, as demonstrated here, and in traditional overdamped fluids used in optical tweezers.

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19

Wu, Z. J., J. Zheng, D. J. Shang, et al. "Particle hygroscopicity and its link to chemical composition in the urban atmosphere of Beijing, China during summertime." Atmospheric Chemistry and Physics Discussions 15, no. 8 (2015): 11495–524. http://dx.doi.org/10.5194/acpd-15-11495-2015.

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Abstract. Simultaneous measurements of particle number size distribution, particle hygroscopic properties, and size-resolved chemical composition were made during the summer of 2014 in Beijing, China. During the measurement period, the median hygroscopicity parameters (κ) of 50, 100, 150, 200, and 250 nm particles are respectively 0.15, 0.19, 0.22, 0.27, and 0.29, showing an increasing trend with increasing particle size. When PM2.5 mass concentration is greater than 50 μg m−3, the fractions of the hydrophilic mode for 150, 250, 350 nm particles increased towards 1 as PM2.5 mass concentration

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20

Willis, M. D., R. M. Healy, N. Riemer, et al. "Quantification of black carbon mixing state from traffic: implications for aerosol optical properties." Atmospheric Chemistry and Physics Discussions 15, no. 22 (2015): 33555–82. http://dx.doi.org/10.5194/acpd-15-33555-2015.

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Abstract. The climatic impacts of black carbon (BC) aerosol, an important absorber of solar radiation in the atmosphere, remain poorly constrained and are intimately related to its particle-scale physical and chemical properties. Using particle-resolved modelling informed by quantitative measurements from a soot-particle aerosol mass spectrometer, we confirm that the mixing state (the distribution of co-emitted aerosol amongst fresh BC-containing particles) at the time of emission significantly affects BC-aerosol optical properties even after a day of atmospheric processing. Both single partic

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21

Zhang, G., X. Bi, L. Li, et al. "Mixing state of individual submicron carbon-containing particles and their seasonal variation in urban Guangzhou, China." Atmospheric Chemistry and Physics Discussions 12, no. 12 (2012): 32707–39. http://dx.doi.org/10.5194/acpd-12-32707-2012.

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Abstract. Growing evidence suggests that size-resolved mixing state of carbon-containing particles is very critical in determining their optical properties, atmospheric lifetime, and impact on the environment. However, still little is known about the mixing state of particles in urban area of Pearl River Delta (PRD) region, China. To investigate the mixing state of submicron carbon-containing particles, measurements were carried out during spring and fall periods of 2010 using a single particle aerosol mass spectrometer (SPAMS). Approximate 700 000 particles for each period were detected. This

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22

Frank, G. P., U. Dusek, and M. O. Andreae. "Technical note: A method for measuring size-resolved CCN in the atmosphere." Atmospheric Chemistry and Physics Discussions 6, no. 3 (2006): 4879–95. http://dx.doi.org/10.5194/acpd-6-4879-2006.

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Abstract. We present a method to investigate cloud condensation nuclei (CCN) concentrations and activation efficiencies as a function of two independent variables, aerosol particle size and water vapor supersaturation. To date, most ambient CCN measurements have been made as the integral (total) CCN concentration as a function of water vapor supersaturation only. However, since CCN properties of aerosol particles are strongly dependent on particle size, as well as on chemical composition, which commonly varies with particle size, more detailed measurements can provide additional important info

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23

Peng, Long, Lei Li, Guohua Zhang, et al. "Technical note: Measurement of chemically resolved volume equivalent diameter and effective density of particles by AAC-SPAMS." Atmospheric Chemistry and Physics 21, no. 7 (2021): 5605–13. http://dx.doi.org/10.5194/acp-21-5605-2021.

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Abstract. Size and effective density (ρe) are important properties of aerosol particles and are related to their influences on human health and the global climate. The volume equivalent diameter (Dve) is an intrinsic property that is used to evaluate particle size. Three definitions of ρe are generally used to characterize the physical property of a particle as an alternative to particle density, in which only the ρeII, defined as the ratio of particle density (ρp) to a dynamic shape factor (χ), has the characteristic of being independent of particle size. However, it is still challenging to s

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24

Zhang, F., Y. Li, Z. Li, et al. "Aerosol hygroscopicity and cloud condensation nuclei activity during the AC<sup>3</sup>Exp campaign: implications for cloud condensation nuclei parameterization." Atmospheric Chemistry and Physics 14, no. 24 (2014): 13423–37. http://dx.doi.org/10.5194/acp-14-13423-2014.

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Abstract. Aerosol hygroscopicity and cloud condensation nuclei (CCN) activity under background conditions and during pollution events are investigated during the Aerosol-CCN-Cloud Closure Experiment (AC3Exp) campaign conducted at Xianghe, China in summer 2013. A gradual increase in size-resolved activation ratio (AR) with particle diameter (Dp) suggests that aerosol particles have different hygroscopicities. During pollution events, the activation diameter (Da) measured at low supersaturation (SS) was significantly increased compared to background conditions. An increase was not observed when

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25

Healy, R. M., J. Sciare, L. Poulain, et al. "Sources and mixing state of size-resolved elemental carbon particles in a European megacity: Paris." Atmospheric Chemistry and Physics Discussions 11, no. 11 (2011): 30333–80. http://dx.doi.org/10.5194/acpd-11-30333-2011.

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Abstract. An Aerosol Time-Of-Flight Mass Spectrometer (ATOFMS) was deployed to investigate the size-resolved chemical composition of single particles at an urban background site in Paris, France, as part of the MEGAPOLI winter campaign in January/February 2010. ATOFMS particle counts were scaled to match coincident Twin Differential Mobility Particle Sizer (TDMPS) data in order to generate hourly size-resolved mass concentrations for the single particle classes observed. The total scaled ATOFMS particle mass concentration in the size range 150–1067 nm was found to agree very well with the sum

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26

Healy, R. M., J. Sciare, L. Poulain, et al. "Sources and mixing state of size-resolved elemental carbon particles in a European megacity: Paris." Atmospheric Chemistry and Physics 12, no. 4 (2012): 1681–700. http://dx.doi.org/10.5194/acp-12-1681-2012.

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Abstract. An Aerosol Time-Of-Flight Mass Spectrometer (ATOFMS) was deployed to investigate the size-resolved chemical composition of single particles at an urban background site in Paris, France, as part of the MEGAPOLI winter campaign in January/February 2010. ATOFMS particle counts were scaled to match coincident Twin Differential Mobility Particle Sizer (TDMPS) data in order to generate hourly size-resolved mass concentrations for the single particle classes observed. The total scaled ATOFMS particle mass concentration in the size range 150–1067 nm was found to agree very well with the sum

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27

Wang, X., L. Zhang, and M. D. Moran. "On the discrepancies between theoretical and measured below-cloud particle scavenging coefficients for rain – a numerical investigation using a detailed one-dimensional cloud microphysics model." Atmospheric Chemistry and Physics 11, no. 22 (2011): 11859–66. http://dx.doi.org/10.5194/acp-11-11859-2011.

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Abstract. Existing theoretical formulations for the size-resolved scavenging coefficient Λ(d) for atmospheric aerosol particles scavenged by rain predict values lower by one to two orders of magnitude than those estimated from field measurements of particle-concentration changes for particles smaller than 3 μm in diameter. Vertical turbulence is not accounted for in the theoretical formulations of Λ(d) but does contribute to the field-derived estimates of Λ(d) due to its influence on the overall concentration changes of aerosol particles in the layers undergoing impaction scavenging. A detaile

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28

Wu, Z. J., J. Zheng, D. J. Shang, et al. "Particle hygroscopicity and its link to chemical composition in the urban atmosphere of Beijing, China, during summertime." Atmospheric Chemistry and Physics 16, no. 2 (2016): 1123–38. http://dx.doi.org/10.5194/acp-16-1123-2016.

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Abstract. Simultaneous measurements of particle number size distribution, particle hygroscopic properties, and size-resolved chemical composition were made during the summer of 2014 in Beijing, China. During the measurement period, the mean hygroscopicity parameters (κs) of 50, 100, 150, 200, and 250 nm particles were respectively 0.16 &amp;pm; 0.07, 0.19 &amp;pm; 0.06, 0.22 &amp;pm; 0.06, 0.26 &amp;pm; 0.07, and 0.28 &amp;pm; 0.10, showing an increasing trend with increasing particle size. Such size dependency of particle hygroscopicity was similar to that of the inorganic

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Zhang Xiao-Jie, Zhao Qian-Qian, and Huang Rong-Zong. "Investigation of the drafting-kissing-tumbling movement of two particles with conjugate heat transfer." Acta Physica Sinica 74, no. 4 (2025): 0. https://doi.org/10.7498/aps.74.20241453.

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The conjugate heat transfer at the particle-fluid interface and the collision between particles play a crucial role in the sedimentation process of particles. In this work, the recent volumetric lattice Boltzmann method for thermal particulate flows with conjugate heat transfer is adopted to investigate the drafting-kissing-tumbling movement in the sedimentation process of two particles in a closed channel. This volumetric lattice Boltzmann method is based on double distribution functions, with the density distribution function for the velocity field and the internal energy distribution functi

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30

Tegze, György, Frigyes Podmaniczky, Ellák Somfai, Tamás Börzsönyi, and László Gránásy. "Orientational order in dense suspensions of elliptical particles in the non-Stokesian regime." Soft Matter 16, no. 38 (2020): 8925–32. http://dx.doi.org/10.1039/d0sm00370k.

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Willis, Megan D., Robert M. Healy, Nicole Riemer, et al. "Quantification of black carbon mixing state from traffic: implications for aerosol optical properties." Atmospheric Chemistry and Physics 16, no. 7 (2016): 4693–706. http://dx.doi.org/10.5194/acp-16-4693-2016.

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Abstract. The climatic impacts of black carbon (BC) aerosol, an important absorber of solar radiation in the atmosphere, remain poorly constrained and are intimately related to its particle-scale physical and chemical properties. Using particle-resolved modelling informed by quantitative measurements from a soot-particle aerosol mass spectrometer, we confirm that the mixing state (the distribution of co-emitted aerosol amongst fresh BC-containing particles) at the time of emission significantly affects BC-aerosol optical properties even after a day of atmospheric processing. Both single partic

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32

Wang, X., L. Zhang, and M. D. Moran. "On the discrepancies between theoretical and measured below-cloud particle scavenging coefficients for rain – a numerical study." Atmospheric Chemistry and Physics Discussions 11, no. 7 (2011): 20375–87. http://dx.doi.org/10.5194/acpd-11-20375-2011.

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Abstract. Existing theoretical formulations for size-resolved scavenging coefficient Λ (r) for atmospheric aerosol particles scavenged by rain predict values lower by one to two orders of magnitude than those estimated from field measurements of particle-concentration changes for particles smaller than 3 μm in diameter. Vertical turbulence does not influence the theoretical formulation of Λ (r), but contributed to the field-generated Λ (r) due to its influence on the overall concentration changes of aerosol particles in the layers undergoing impaction scavenging. A detailed one-dimensional clo

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33

Puderbach, Vanessa, Kilian Schmidt, and Sergiy Antonyuk. "A Coupled CFD-DEM Model for Resolved Simulation of Filter Cake Formation during Solid-Liquid Separation." Processes 9, no. 5 (2021): 826. http://dx.doi.org/10.3390/pr9050826.

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In cake filtration processes, where particles in a suspension are separated by forming a filter cake on the filter medium, the resistances of filter cake and filter medium cause a specific pressure drop which consequently defines the process energy effort. The micromechanics of the filter cake formation (interactions between particles, fluid, other particles and filter medium) must be considered to describe pore clogging, filter cake growth and consolidation correctly. A precise 3D modeling approach to describe these effects is the resolved coupling of the Computational Fluid Dynamics with the

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34

Deventer, Malte Julian, Frank Griessbaum, and Otto Klemm. "Size-resolved flux measurement of sub-micrometer particles over an urban area." Meteorologische Zeitschrift 22, no. 6 (2013): 729–37. http://dx.doi.org/10.1127/0941-2948/2013/0441.

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Guo, Xiaoman, Sina Alavi, Elham Dalir, Jingmin Dai, and Javad Mostaghimi. "Time-resolved particle image velocimetry and 3D simulations of single particles in the new conical ICP torch." Journal of Analytical Atomic Spectrometry 34, no. 3 (2019): 469–79. http://dx.doi.org/10.1039/c8ja00407b.

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Ghosal, Sutapa, Peter K. Weber, and Alexander Laskin. "Spatially resolved chemical imaging of individual atmospheric particles using nanoscale imaging mass spectrometry: insight into particle origin and chemistry." Anal. Methods 6, no. 8 (2014): 2444–51. http://dx.doi.org/10.1039/c3ay42012d.

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Knowledge of the spatially resolved composition of atmospheric particles is essential for differentiating between their surface versus bulk chemistry and understanding particle reactivity and the potential environmental impact.

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Hong, J., S. A. K. Häkkinen, M. Paramonov, et al. "Hygroscopicity, CCN and volatility properties of submicron atmospheric aerosol in a boreal forest environment during the summer of 2010." Atmospheric Chemistry and Physics 14, no. 9 (2014): 4733–48. http://dx.doi.org/10.5194/acp-14-4733-2014.

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Abstract. A Volatility-Hygroscopicity Tandem Differential Mobility Analyzer (VH-TDMA) was applied to study the hygroscopicity and volatility properties of submicron atmospheric aerosol particles in a boreal forest environment in Hyytiälä, Finland during the summer of 2010. Aitken and accumulation mode internally mixed particles (50 nm, 75 nm and 110 nm in diameter) were investigated. Hygroscopicity was found to increase with particle size. The relative mass fraction of organics and SO42- is probably the major contributor to the fluctuation of the hygroscopicity for all particle sizes. The Clou

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Shao, Xueming, Tenghu Wu, and Zhaosheng Yu. "Fully resolved numerical simulation of particle-laden turbulent flow in a horizontal channel at a low Reynolds number." Journal of Fluid Mechanics 693 (January 17, 2012): 319–44. http://dx.doi.org/10.1017/jfm.2011.533.

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AbstractA fictitious domain method is used to perform fully resolved numerical simulations of particle-laden turbulent flow in a horizontal channel. The effects of large particles of diameter 0.05 and 0.1 times the channel height on the turbulence statistics and structures are investigated for different settling coefficients and volume fractions (0.79 %–7.08 %) for the channel Reynolds number being 5000. The results indicate the following. (a) When the particle sedimentation effect is negligible (i.e. neutrally buoyant), the presence of particles decreases the maximum r.m.s. of streamwise velo

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Waza, Andebo, Kilian Schneiders, Johannes Heuser, and Konrad Kandler. "Analysis of Size Distribution, Chemical Composition, and Optical Properties of Mineral Dust Particles from Dry Deposition Measurement in Tenerife: Determined by Single-Particle Characterization." Atmosphere 14, no. 4 (2023): 700. http://dx.doi.org/10.3390/atmos14040700.

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In this paper, individual particle analysis by automated scanning electron microscopy (SEM) coupled with energy-dispersive X-ray (EDX) was used to assess the size-resolved information of composition, size distribution, complex refractive index, and mixing state of mineral dust aerosol particles collected using different passive and active samplers. In the study, over 120,000 particles from 53 samples were analyzed. Results show that dust particles are the dominating mineral particle type during this campaign, comprising different classes of silicates, Si-rich (quartz-like), Ca-rich (calcite-li

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Zhang, G., X. Bi, L. Li, et al. "Mixing state of individual submicron carbon-containing particles during spring and fall seasons in urban Guangzhou, China: a case study." Atmospheric Chemistry and Physics 13, no. 9 (2013): 4723–35. http://dx.doi.org/10.5194/acp-13-4723-2013.

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Abstract. Growing evidence suggests that the size-resolved mixing state of carbon-containing particles is very critical in determining their optical properties, atmospheric lifetime, and impact on the environment. However, still little is known about the mixing state of particles in the urban area of the Pearl River Delta (PRD) region, China. To investigate the mixing state of submicron carbon-containing particles, measurements were carried out during spring and fall periods of 2010 using a single-particle aerosol mass spectrometer (SPAMS). Approximately 700 000 particles for each period were

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Aria, Arash Imani, Bjørn Holmedal, Tomas Mánik, and Knut Marthinsen. "A Full-Field Crystal Plasticity Study on the Bauschinger Effect Caused by Non-Shearable Particles and Voids in Aluminium Single Crystals." Metals 14, no. 4 (2024): 424. http://dx.doi.org/10.3390/met14040424.

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In the present work, the goal is to use two-scale simulations to be incorporated into the full-field open software DAMASK crystal plasticity framework, in relation to the Bauschinger effect caused by the composite effect of the presence of second-phase particles with surrounding deformation zones. The idea is to achieve this by including a back stress of the critical resolved shear stress in a single-phase simulation, as an alternative to explicitly resolving the second-phase particles in the system. The back stress model is calibrated to the volume-averaged behaviour of detailed crystal plast

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Saitoh, Katsumi, Masayuki Shima, Yoshiko Yoda, et al. "Physicochemical characterization and size-resolved source apportionment of airborne particles in Himeji City, Japan." International Journal of PIXE 24, no. 01n02 (2014): 1–15. http://dx.doi.org/10.1142/s0129083514500016.

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As a part of epidemiological study on the effects of the chemical composition of airborne particulate matter (PM) and ozone on asthma attacks, we carried out size-resolved sampling of PM in Himeji City, Japan and elemental and ionic composition analyses of the PM samples. Size-resolved PM was collected using a 3-stage NLAS impactor (Tokyo Dylec Co., Ltd.; particle cut size at sampling stages was 10, 2.5 and 1.0 [Formula: see text]m for a flow rate of 3 L/min) with a 1-week sampling interval from November 2009 to May 2012. Concentrations of several elemental and ionic species in the PM samples

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Zhai, Jinghao, Xiaohui Lu, Ling Li, et al. "Size-resolved chemical composition, effective density, and optical properties of biomass burning particles." Atmospheric Chemistry and Physics 17, no. 12 (2017): 7481–93. http://dx.doi.org/10.5194/acp-17-7481-2017.

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Abstract. Biomass burning aerosol has an important impact on the global radiative budget. A better understanding of the correlations between the mixing states of biomass burning particles and their optical properties is the goal of a number of current studies. In this work, the effective density, chemical composition, and optical properties of rice straw burning particles in the size range of 50–400 nm were measured using a suite of online methods. We found that the major components of particles produced by burning rice straw included black carbon (BC), organic carbon (OC), and potassium salts

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Payne, Lukas M., Wiebke Albrecht, Wolfgang Langbein, and Paola Borri. "The optical nanosizer – quantitative size and shape analysis of individual nanoparticles by high-throughput widefield extinction microscopy." Nanoscale 12, no. 30 (2020): 16215–28. http://dx.doi.org/10.1039/d0nr03504a.

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We demonstrate rapid and quantitative nanoparticle analysis by measuring the polarisation-resolved optical extinction cross-section of hundreds of particles in wide-field microscopy, determining particle size and shape via modelling.

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Stevens, R. G., and J. R. Pierce. "The contribution of plume-scale nucleation to global and regional aerosol and CCN concentrations: evaluation and sensitivity to emissions changes." Atmospheric Chemistry and Physics Discussions 14, no. 15 (2014): 21473–521. http://dx.doi.org/10.5194/acpd-14-21473-2014.

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Abstract. We implement the Predicting Particles Produced in Power-Plant Plumes (P6) sub-grid sulphate parameterization for the first time into a global chemical-transport model with online aerosol microphysics, the GEOS-Chem-TOMAS model. Compared to simulations using two other previous treatments of sub-grid sulphate, simulations using P6 sub-grid sulphate predicted similar or smaller increases (depending on other model assumptions) in globally, annually averaged concentrations of particles larger than 80 nm (N80). We test the sensitivity of particle number concentrations in simulations using

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Stevens, R. G., and J. R. Pierce. "The contribution of plume-scale nucleation to global and regional aerosol and CCN concentrations: evaluation and sensitivity to emissions changes." Atmospheric Chemistry and Physics 14, no. 24 (2014): 13661–79. http://dx.doi.org/10.5194/acp-14-13661-2014.

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Abstract. We implement the Predicting Particles Produced in Power-Plant Plumes (P6) sub-grid sulphate parameterization for the first time into a global chemical-transport model with online aerosol microphysics, the GEOS-Chem-TOMAS model. Compared to simulations using two other previous treatments of sub-grid sulphate, simulations using P6 sub-grid sulphate predicted similar or smaller increases (depending on other model assumptions) in globally, annually averaged concentrations of particles larger than 80 nm (N80). We test in simulations using P6 sub-grid sulphate the sensitivity of particle n

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Straaten, Agnes, and Stephan Weber. "Measurement report: Three years of size-resolved eddy-covariance particle number flux measurements in an urban environment." Atmospheric Chemistry and Physics 21, no. 24 (2021): 18707–26. http://dx.doi.org/10.5194/acp-21-18707-2021.

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Abstract. Size-resolved particle number fluxes in the size range of 10 nm < particle diameter (Dp) < 200 nm were measured over a 3-year period (April 2017–March 2020) using the eddy-covariance technique at an urban site in Berlin, Germany. The observations indicated the site as a net source of particles with a median total particle number flux of FTNC=0.86 × 108 m−2 s−1. The turbulent surface–atmosphere exchange of particles was clearly dominated by ultrafine particles (Dp < 100 nm) with a share of 96 % of total particle number flux (FUFP=0.83 × 108 m−2 s−1). Annual estimates of media

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Wang, Zekun, Khuram Walayat, and Moubin Liu. "A velocity corrected unresolved CFD-DEM coupled method to reproduce wake effects at moderate Reynolds number." Engineering Computations 36, no. 8 (2019): 2612–33. http://dx.doi.org/10.1108/ec-10-2018-0454.

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Purpose The purpose of this paper is to develop a corrected unresolved CFD-DEM method that can reproduce the wake effects in modeling particulate flows at moderate Reynolds number. Design/methodology/approach First, the velocity field in the wake behind a settling particle is numerically investigated by a resolved method, in which the finite volume method (FVM) is applied to model the fluid flow, discrete element method (DEM) is applied to simulate the motion of particles and immersed boundary method (IBM) is used to tackle fluid solid interaction. Second, an analytical scaling law is given, w

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Bergmann, Stephan, Oliver Wrede, Thomas Huser, and Thomas Hellweg. "Super-resolution optical microscopy resolves network morphology of smart colloidal microgels." Physical Chemistry Chemical Physics 20, no. 7 (2018): 5074–83. http://dx.doi.org/10.1039/c7cp07648g.

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We present a new method to resolve the network morphology of colloidal particles in an aqueous environment via super-resolution microscopy. The 3D structure of thermoresponsive microgels with different cross-linker content is resolved and compared to established models.

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Dietzel, M., M. Ernst, and M. Sommerfeld. "Application of the Lattice-Boltzmann Method for Particle-laden Flows: Point-particles and Fully Resolved Particles." Flow, Turbulence and Combustion 97, no. 2 (2016): 539–70. http://dx.doi.org/10.1007/s10494-015-9698-x.

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