THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Fu-Jun Gan

,

Jian-Zhong Lin

EVOLUTION OF PARTICLE SIZE DISTRIBUTION IN AIR IN THE RAINFALL PROCESS VIA THE MOMENT METHOD

ABSTRACT
Population balance equation is converted to three moment equations to describe the dynamical behavior of particle size distribution in air in the rainfall. The scavenging coefficient is expressed as a polynomial function of the particle diameter, the raindrop diameter and the raindrop velocity. The evolutions of particle size distribution are simulated numerically and the effects of the raindrop size distribution on particle size distribution are studied. The results show that the raindrops with smaller geometric mean diameter and geometric standard deviation of size remove particles much more efficiently. The particles which fall in the “greenfield gap” are the most difficult to be scavenged from the air.
KEYWORDS
particles in air in the rainfall process, scavenging coefficient, distribution of particle, numerical simulation
PAPER SUBMITTED: 2012-08-01
PAPER REVISED: 2012-09-08
PAPER ACCEPTED: 2012-09-12
DOI REFERENCE: https://doi.org/10.2298/TSCI1205372G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 5, PAGES [1372 - 1376]
REFERENCES
  1. Slinn, W. G. N., Precipitation Scavenging, in: Atmospheric Sciences and Power Production (Ed. D. Raderson), Division of Biomedical Environmental Research, US Department of Energy, Washington D. C., 1983, pp. 386-392
  2. Andronache, C., Estimated Variability of Below-Cloud Aerosol Removal by Rainfall for Observed Aerosol Size Distributions, Atmospheric Chemistry and Physics, 3 (2003), 6, pp. 131-143
  3. Andronache, C., Diffusion and Electric Charge Contributions to Below-Cloud Wet Removal of Atmospheric Ultra-Fine Aerosol Particles, Journal of Aerosol Science, 35 (2004), 12, pp. 1467-1482
  4. Andronache, C., et al., Scavenging of Ultrafine Particles by Rainfall at a Boreal Site: Observations and Model Estimations, Atmospheric Chemistry and Physics, 6 (2006), 12, pp. 4739-4754
  5. Mircea, M., Stefan, S., Fuzzi, S., Precipitation Scavenging Coefficient: Influence of Measured Aerosol and Raindrop Size Distribution, Atmospheric Environment, 34 (2000), 29, pp. 5169-5174
  6. Lee, K. W., Liu, B. Y., Theoretical Study of Aerosol Filtration by Fibrous Filters, Aerosol Science and Technology, 1 (1982), pp. 147-161
  7. Bae, S. Y., Jung, C. H., Kim, Y. P., Derivation and Verification of an Aerosol Dynamics Expression for the Below-Cloud Scavenging Process Using the Moment Method, Journal of Aerosol Science, 41 (2010), 3, pp. 266-280
PDF VERSION [DOWNLOAD]
Evolution of particle size distribution in air in the rainfall process via the moment method

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence