Measurement and numerical simulation of ultrafine particle size distribution in the early stage of high-sodium lignite combustion

2017 ◽  
Vol 36 (2) ◽  
pp. 2083-2090 ◽  
Author(s):  
Qi Gao ◽  
Shuiqing Li ◽  
Mengmeng Yang ◽  
Pratim Biswas ◽  
Qiang Yao
Keyword(s):  
Numerical Simulation ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Early Stage ◽  
Ultrafine Particle ◽  
High Sodium

EARLY-STAGE EVOLUTION OF PARTICLE SIZE DISTRIBUTION DUE TO GRAVITATIONAL COAGULATION

2000 ◽  
Vol 18 (2) ◽  
pp. 89-102 ◽  
Author(s):  
C. H. JUNG ◽  
S. H. PARK ◽  
K. W. LEE ◽  
M. R. KUHLMAN
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Early Stage

scholarly journals Evidence of an elevated source of nucleation based on model simulations and data from the NIFTy experiment

2012 ◽  
Vol 12 (17) ◽  
pp. 8021-8036 ◽  
Author(s):  
P. Crippa ◽  
T. Petäjä ◽  
H. Korhonen ◽  
G. S. El Afandi ◽  
S. C. Pryor
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Ultrafine Particle ◽  
Ground Level ◽  
Particle Formation ◽  
Atmospheric Conditions ◽  
New Particle Formation ◽  
Near Surface ◽  
Nocturnal Inversion

Abstract. New particle formation has been observed at a number of ground-based measurement sites. Prior research has provided evidence that this new particle formation, while observed in the near-surface layer, is actually occurring in atmospheric layers above the surface and appears to be focused in or close to the residual layer formed by the nocturnal inversion. Here, we present both observations and modeling for southern Indiana which support this postulate. Based on simulations with a detailed aerosol dynamics model and the Weather Research and Forecasting model, along with data from ground-based remote sensing instruments and detailed gas and particle phase measurements, we show evidence that (i) the maximum rate change of ultrafine particle concentrations as observed close to the surface is always preceded by breakdown of the nocturnal inversion and enhancement of vertical mixing and (ii) simulated particle size distributions exhibit greatest accord with surface observations during and subsequent to nucleation only when initialized with a particle size distribution representative of clear atmospheric conditions, rather than the in situ (ground-level) particle size distribution.

Measurements of ultrafine particle size distribution near Rome

2010 ◽  
Vol 98 (1) ◽  
pp. 69-77 ◽  
Author(s):  
Fenjuan Wang ◽  
Francesca Costabileb ◽  
Hong Li ◽  
Dong Fang ◽  
Ivo Alligrini
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Ultrafine Particle

scholarly journals Effect of electronic cigarette (EC) aerosols on particle size distribution in indoor air and in a radon chamber

Nukleonika ◽  
2019 ◽  
Vol 64 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Hyam Nazmy Khalaf ◽  
Mostafa Y. A. Mostafa ◽  
Michael Zhukovsky
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Indoor Air ◽  
Size Range ◽  
Aerosol Particles ◽  
Ultrafine Particle ◽  
Decay Product ◽  
Electronic Cigarette ◽  
Particle Size Range

Abstract Particle size distribution is an important factor governing whether aerosols can be deposited in various respiratory tract regions in humans. Recently, electronic cigarette (EC), as the alternative of tobacco cigarette, has become increasingly popular all over the world. However, emissions from ECs may contribute to both indoor and outdoor air pollution; moreover, comments about their safety remain controversial, and the number of users is increasing rapidly. In this investigation, aerosols were generated from ECs and studied in the indoor air and in a chamber under controlled conditions of radon concentration. The generated aerosols were characterized in terms of particle number concentrations, size, and activity distributions by using aerosol diffusion spectrometer (ADS), diffusion battery, and cascade impactor. The range of ADS assessment was from 10−3 μm to 10 μm. The number concentration of the injected aerosol particles was between 40 000 and 100 000 particles/cm3. The distribution of these particles was the most within the ultrafine particle size range (0–0.2 μm), and the other particle were in the size range from 0.3 μm to 1 μm. The surface area distribution and the mass size distribution are presented and compared with bimodal distribution. In the radon chamber, all distributions were clearly bimodal, as the free radon decay product was approximately 1 nm in diameter, with a fraction of ~0.7 for a clean chamber (without any additional source of aerosols). The attached fraction with the aerosol particles from the ECs had a size not exceeding 1.0 μm.

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