The Technology of Droplet Measurement with Cascade Impactors

1986 ◽  
Vol 3 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Armin Büurkholz
Keyword(s):  
Cascade Impactors

82. 24-HR Ambient and Residential Aerosol Characterization Using Automated Piezoelectric Cascade Impactors

2002 ◽  
Author(s):  
C. Marcham ◽  
D. Johnson ◽  
N. Esmen ◽  
R. Clinkenbeard ◽  
R. Lynch
Keyword(s):  
Cascade Impactors ◽  
Aerosol Characterization

Geophysical applicability of aerosol size distribution measurements using cascade impactors and proton induced X-ray emission

1976 ◽  
Vol 10 (8) ◽  
pp. 571-576 ◽  
Author(s):  
R.E. Van Grieken ◽  
T.B. Johansson ◽  
K.R. Akselsson ◽  
J.W. Winchester ◽  
J.W. Nelson ◽  
...  
Keyword(s):  
Size Distribution ◽  
Aerosol Size Distribution ◽  
X Ray ◽  
Cascade Impactors

A Simplified Model for the Flow Inside Cascade Impactor

2013 ◽  
Author(s):  
Seyyed Mahdi Nemati Mehr ◽  
Salman Sohrabi ◽  
Pedram Falsafi ◽  
Paniz Gorji
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Low Cost ◽  
Mass Difference ◽  
Cascade Impactor ◽  
Computational Method ◽  
Simplified Model ◽  
Unit Value ◽  
Cascade Impactors

In this paper we developed a new mathematical model for the flow inside cascade impactors and via this simplified model, we determined the particle size distribution by a fast and low cost computational method. Using cascade impactors for determining the particle size distribution, one can use comprehensive CFD methods to fully simulate the particle traces. Although the results from those CFD analyses can be very accurate, usually that is not a time and cost efficient routine. In contrast, we showed that by using our proposed calculation we can estimate the particle size distribution very fast and yet with the slight error — comparing to the results from CFD method. Cascade impactors are being used to measure the range of substances moving through an opening and determine the particle size of distributed substances. Air flow containing aerosol entering in each stage, after colliding vertically with a plate will deviate 90 degrees from its original direction. Larger (massive) particles cannot follow the flow because of their larger linear momentum. Hence, they will deviate from the flow and deposit on the plate instead. The mass difference before and after the experiment represents the deposited mass in each stage. By integrating multiple uniquely designed stages into one impactor, we can determine size of particles in the flow. Typical cascade impactors consist of up to ten stages in which different size of aerosols are being separated. This paper presents a simple model for the flow in one single stage of a cascade impactor. Flow inside cascade impactor is approximated by stagnation point potential flow with the stream function of Psi = Axy, and particles are tracked by velocity verlet algorithm. Absorbed particles are associated with unit value; otherwise they are associated with zero. It is assumed that particles in entrance have random size distribution and location. Drag, Saffman and Brownian forces are taken into account in this model for different particle sizes. The results are discussed in detail and compared with data driven from different approaches in the literature.

Nonideal collection characteristics of single stage and cascade impactors

AIHAJ ◽  
1977 ◽  
Vol 38 (4) ◽  
pp. 174-179 ◽  
Author(s):  
A. K. RAO ◽  
K. T. WHITBY
Keyword(s):  
Single Stage ◽  
Cascade Impactors

Stage Response Calibration of the Mark III and Marple Personal Cascade Impactors

1991 ◽  
Vol 14 (3) ◽  
pp. 365-379 ◽  
Author(s):  
Daniel J. Rader ◽  
Lisa A. Mondy ◽  
John E. Brockmann ◽  
Daniel A. Lucero ◽  
Kenneth L. Rubow
Keyword(s):  
Cascade Impactors
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