Application of the TheRmophoretic Annular Precipitator (TRAP) for the study of soot aggregates morphological influence on their thermophoretic behaviour

Yahia, Lyes Ait Ali; Gehin, Evelyne; Sagot, Benoît

doi:10.1016/j.jaerosci.2017.07.018

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…Under these selection conditions, the DMA-CPMA can select monodispersed particles when the D fm of the particles is larger than the critical slope of PP 0 . When selecting small aspherical particles or particles with extremely low density, the critical slope of PP 0 is relatively higher, and the DMA-CPMA classification is sensitive to the (Park et al, 2003;Rissler et al, 2013;Tavakoli et al, 2014;Ait Ali Yahia et al, 2017;Dastanpour et al, 2017;Forestieri et al, 2018;Pei et al, 2018;Kazemimanesh et al, 2019) and generated in this study (see details in Sect. 3.2).…”

Section: Dma-cpmamentioning

confidence: 78%

“…As shown in Fig. 3, d m , m and the corresponding D fm were taken from the literature (Park et al, 2003;Rissler et al, 2013;Tavakoli et al, 2014;Ait Ali Yahia et al, 2017;Dastanpour et al, 2017;Forestieri et al, 2018;Pei et al, 2018;Kazemimanesh et al, 2019a). Generally, for soot particles with D fm of 2.2-2.4, the multiple charging effect can be avoided for the DMA-CPMA when selecting soot particles with mobility diameters larger than 200 nm, while it fails to eliminate multiply charged particles when selecting small soot particles, as shown by the circles and squares in Fig.…”

Section: Dma-cpmamentioning

confidence: 99%

“…The contour lines denote the critical slope of PP 0 , with values labeled on them. The data points are soot particles measured in the literature(Park et al, 2003;Rissler et al, 2013;Tavakoli et al, 2014;Ait Ali Yahia et al, 2017;Dastanpour et al, 2017; Forestieri et al, 2018;Pei et al, 2018;Kazemimanesh et al, 2019) and generated in this study (see details in Sect. 3.2).…”

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Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

et al. 2022

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Abstract. Accurate particle classification plays a vital role in aerosol studies. Differential mobility analyzers (DMAs), centrifugal particle mass analyzers (CPMAs) and aerodynamic aerosol classifiers (AACs) are commonly used to select particles with a specific mobility diameter, aerodynamic diameter or mass, respectively. However, multiple charging effects cannot be entirely avoided when using either individual techniques or tandem systems such as DMA–CPMA, especially when selecting soot particles with fractal structures. In this study, we calculate the transfer functions of the DMA–CPMA and DMA–AAC in static configurations for flame-generated soot particles. We propose an equation that constrains the resolutions of the DMA and CPMA to eliminate the multiple charging effect when selecting particles with a certain mass–mobility relationship using the DMA–CPMA system. The equation for the DMA–AAC system is also derived. For DMA–CPMA in a static configuration, our results show that the ability to remove multiply charged particles mainly depends on the particle morphology and resolution settings of the DMA and CPMA. Using measurements from soot experiments and literature data, a general trend in the appearance of the multiple charging effect with decreasing size when selecting aspherical particles is observed. As for DMA–AAC in a static configuration, the ability to eliminate particles with multiple charges is mainly related to the resolutions of the classifiers. In most cases, the DMA–AAC in a static configuration can eliminate the multiple charging effect regardless of the particle morphology, but multiply charged particles will be selected when decreasing the resolution of the DMA or AAC. We propose that the potential influence of the multiple charging effect should be considered when using the DMA–CPMA or DMA–AAC systems in estimating size- and mass-resolved optical properties in field and lab experiments.

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Section: Dma-cpmamentioning

confidence: 78%

Section: Dma-cpmamentioning

confidence: 99%

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confidence: 99%

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Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

et al. 2022

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“…As shown in Fig. 3, the dm, m and corresponding Dfm were taken from literature (Park et al, 2003;Rissler et al, 2013;Ait Ali Yahia et al, 2017;Dastanpour et al, 2017;Kazemimanesh et al, 2019). Generally, multiple charging effect can be avoided for DMA-CPMA to select soot particles with diameter larger than 200 nm., while fails to eliminate multiply charged particles when selecting small soot particles.…”

Section: Dma-cpmamentioning

confidence: 99%

Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating multiple charging effect

Song

Pei

Liu

et al. 2022

Preprint

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Abstract. Accurate particle classification plays a vital role in aerosol studies. Differential mobility analyzer (DMA), centrifugal particle mass analyzer (CPMA) and aerodynamic aerosol classifier (AAC) are commonly used to select particles with a specific size or mass. However, multiple charging effect cannot be entirely avoided either using individual technique or using tandem system such as DMA-CPMA, especially when selecting soot particles with fractal structures. In this study, we demonstrate the transfer functions of DMA-CPMA and DMA-AAC systems, as well as the potential multiple charging effect. Our results show that the ability to remove multiply charged particles mainly depends on particles morphology and instruments setups of DMA-CPMA system. Using measurements from soot experiments and literature data, a general trend in the appearance of multiple charging effect with decreasing size when selecting aspherical particles was observed. Otherwise, our results indicated that the ability of DMA-AAC to resolve particles with multiple charges is mainly related to the resolutions of classifiers. In most cases, DMA-AAC can eliminate multiple charging effect regardless of the particle morphology, while particles with multiple charges can be selected when decreasing resolutions of DMA and AAC. We propose that the multiple charging effect should be reconsidered when using DMA-CPMA or DMA-AAC system in estimating size and mass resolved optical properties in the field and lab experiments.

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Comparison of characteristics evaluated by different fractal approaches of soot agglomerates produced by a combustion aerosol generator

Paz

Cabarcos

Conde

et al. 2022

Experimental Thermal and Fluid Science

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Application of the TheRmophoretic Annular Precipitator (TRAP) for the study of soot aggregates morphological influence on their thermophoretic behaviour

Cited by 7 publications

References 20 publications

Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect

Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating multiple charging effect

Comparison of characteristics evaluated by different fractal approaches of soot agglomerates produced by a combustion aerosol generator

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