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Relative contributions of individual phoretic effect in the below-cloud scavenging process

Title
Relative contributions of individual phoretic effect in the below-cloud scavenging process
Authors
Bae S.Y.Jung C.H.Kim Y.P.
Ewha Authors
김용표
SCOPUS Author ID
김용표scopus
Issue Date
2009
Journal Title
Journal of Aerosol Science
ISSN
0021-8502JCR Link
Citation
vol. 40, no. 7, pp. 621 - 632
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We systematically estimate the thermophoretic and diffusiophoretic effect to the below-cloud scavenging coefficient based on the below-cloud scavenging coefficient expression derived in Bae, Jung, and Kim [(2006). Development and evaluation of an expression for polydisperse particle scavenging coefficient for the below-cloud scavenging as a function of rain intensity using the moment method. J. Aerosol Sci. 37, 1507]. The temperature difference between the ambient air temperature (T) and raindrop surface temperature (T s), denoted (T-T s), is the most important factor to the thermophoretic effect. The scavenging coefficient by diffusiophoresis is mainly affected by T, (T-T s), and relative humidity (RH). The diffusiophoresis increases with the decrease of (T-T s). The driving force of diffusiophoresis increases with the increase of T. As RH becomes lower, diffusiophoresis is more effective. The relative contribution of thermophoresis and diffusiophoresis shows opposite trend to the changes of both T and (T-T s) at all T except (T-T s) being 1 °C. Thermophoresis and diffusiophoresis are important to the scavenging process when particle diameter is between 0.1 and 10 μm, especially around 1 μm. © 2009 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.jaerosci.2009.03.003
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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