Fractional Efficiency and Particle Mass Loading Characteristics of Engine Air Filters

1997 ◽  
Author(s):  
Wai S. Poon ◽  
Benjamin Y.H. Liu ◽  
Neville Bugli
Keyword(s):  
Particle Mass ◽  
Mass Loading ◽  
Air Filters ◽  
Fractional Efficiency

Performance of a slit virtual impactor operated at high particle mass loading

2005 ◽  
Vol 36 (4) ◽  
pp. 541-547 ◽  
Author(s):  
Satyanarayanan Seshadri ◽  
Denis J. Phares ◽  
Taekyun Kim ◽  
Kenneth D. Kihm ◽  
Don D. Smith ◽  
...  
Keyword(s):  
Particle Mass ◽  
Mass Loading ◽  
High Particle ◽  
Virtual Impactor

scholarly journals Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene

2018 ◽  
Vol 18 (3) ◽  
pp. 1643-1652 ◽  
Author(s):  
Mallory L. Hinks ◽  
Julia Montoya-Aguilera ◽  
Lucas Ellison ◽  
Peng Lin ◽  
Alexander Laskin ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Secondary Organic Aerosol ◽  
High Resolution Mass Spectrometry ◽  
Organic Aerosol ◽  
Particle Mass ◽  
Mass Loading ◽  
Scanning Mobility Particle Sizer ◽  
Produce Water ◽  
Seed Particles ◽  
Dry Conditions

Abstract. The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NOx toluene oxidation in the absence of seed particles was investigated. SOA samples were prepared in an aerosol smog chamber at < 2 % RH and 75 % RH, collected on Teflon filters, and analyzed with nanospray desorption electrospray ionization high-resolution mass spectrometry (nano-DESI–HRMS). Measurements revealed a significant reduction in the fraction of oligomers present in the SOA generated at 75 % RH compared to SOA generated under dry conditions. In a separate set of experiments, the particle mass concentrations were measured with a scanning mobility particle sizer (SMPS) at RHs ranging from < 2 to 90 %. It was found that the particle mass loading decreased by nearly an order of magnitude when RH increased from < 2 to 75–90 % for low-NOx toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the “molecular corridor” approach, confirmed that low-NOx toluene SOA became more volatile on average under high-RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NOx toluene SOA. The observed increase in the oligomer fraction and particle mass loading under dry conditions were attributed to the enhancement of condensation reactions, which produce water and oligomers from smaller compounds in low-NOx toluene SOA. The reduction in the fraction of oligomeric compounds under humid conditions is predicted to partly counteract the previously observed enhancement in the toluene SOA yield driven by the aerosol liquid water chemistry in deliquesced inorganic seed particles.

Study of particle mass loading effects on sand erosion in a series of fittings

2020 ◽  
Vol 373 ◽  
pp. 118-141 ◽  
Author(s):  
A. Farokhipour ◽  
Z. Mansoori ◽  
M.A. Rasoulian ◽  
A. Rasteh ◽  
M. Saffar-Avval ◽  
...  
Keyword(s):  
Particle Mass ◽  
Mass Loading ◽  
Sand Erosion ◽  
Loading Effects

Particle Mass Loading Effect on a Two-Phase Turbulent Downward Jet Flow

1993 ◽  
Vol 10 (4) ◽  
pp. 173-181 ◽  
Author(s):  
Biing-Hwang Jou ◽  
Horn-Jiunn Sheen ◽  
Yuh-Tzyh Lee
Keyword(s):  
Jet Flow ◽  
Particle Mass ◽  
Mass Loading ◽  
Two Phase ◽  
Loading Effect

scholarly journals Effect of Relative Humidity on the Composition of Secondary Organic Aerosol from Oxidation of Toluene

2017 ◽  
Author(s):  
Mallory L. Hinks ◽  
Julia Montoya-Aguilera ◽  
Lucas Ellison ◽  
Peng Lin ◽  
Alexander Laskin ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Secondary Organic Aerosol ◽  
High Resolution Mass Spectrometry ◽  
Desorption Electrospray Ionization ◽  
Organic Aerosol ◽  
Particle Mass ◽  
Mass Loading ◽  
Scanning Mobility Particle Sizer ◽  
Dry Conditions ◽  
Order Of Magnitude

Abstract. The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NOx toluene oxidation was investigated. SOA samples were prepared in an aerosol smog chamber at <2% RH and 75% RH, collected on Teflon filters and analyzed with nanospray desorption electrospray ionization high-resolution mass spectrometry (nano-DESI-HRMS). Measurements revealed a significant reduction in the fraction of oligomers present in the SOA generated at 75% RH compared to SOA generated under dry conditions. In a separate set of experiments, the particle mass concentrations were measured with a Scanning Mobility Particle Sizer (SMPS) at RHs ranging from <2% to 90%. It was found that the particle mass loading decreased by nearly an order of magnitude when RH increased from <2% to 75–90% for low-NOx toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the molecular corridor approach, confirmed that SOA became more volatile on average under high RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NOx toluene SOA. The observed increase in the oligomer fraction and particle mass loading were attributed to enhancement of condensation reactions under dry conditions.

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