Cunningham correction factor

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Air Pollution and Its Control

Published in Danny D. Reible, Fundamentals of Environmental Engineering, 2017

This is approximately 12 times the unit charge of 1.6 (10)− 19 C. If the calculated charge on a particle were less than the unit charge, we would not expect to charge or collect such a particle. The Cunningham correction factor for a 0.5-µm particle at 300 K is about 1.34 from Equation 6.73. Thus, the collection velocity is, combining Equations 6.88 and 6.89vp=1.343⋅0.0666kg/(m⋅h)(20⋅10−19C)5000V/cm0.5⋅10−6m=4.8⋅cm/sThe efficiency of collection is then given by Equation 6.90η = 1−e−0.048 m/s3.33m3/(m2min)=0.58

Nonuniform particle distribution and interference between removal mechanisms during unsteady aerosol deposition from a rising spherical bubble

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Journal Information

Published in Journal of Nuclear Science and Technology, 2022

Kosuke Motegi, Yasuteru Sibamoto, Yutaka Kukita

where is the Cunningham correction factor that deviates from unity when the particle radius is not much larger than the mean free path of gas molecules. The values of coefficients in Equation (6b) are those obtained by Davies [33] for air. Brownian force is modeled as a Gaussian white noise random process [34]: