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| Titel |
Freezing of water droplets colliding with kaolinite particles |
| VerfasserIn |
E. A. Svensson, C. Delval, P. Hessberg, M. S. Johnson, J. B. C. Pettersson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 13 ; Nr. 9, no. 13 (2009-07-03), S.4295-4300 |
| Datensatznummer |
250007485
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| Publikation (Nr.) |
 copernicus.org/acp-9-4295-2009.pdf |
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| Zusammenfassung |
Contact freezing of single supercooled water droplets colliding with
kaolinite dust particles has been investigated. The experiments were
performed with droplets levitated in an electrodynamic balance at
temperatures from 240 to 268 K. Under relatively dry conditions
(when no water vapor was added) freezing was observed
to occur below 249 K, while a freezing threshold of 267 K was observed when water vapor was added
to the air in the chamber.
The effect of relative humidity is attributed to an
influence on the contact freezing process for the kaolinite-water droplet
system, and it is not related to the lifetime of the droplets in the
electrodynamic balance. Freezing probabilities per collision were derived
assuming that collisions at the lowest temperature employed had a probability
of unity. Mechanisms for contact freezing are briefly discussed. |
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