Summary
An investigation of heated surfaces of glass, metal and oil as sources of condensation nuclei is reported. Below a certain transition temperature the nucleus production is of a temporary nature and decreases to zero with the continued heating of the surface. Above this temperature, however, the nucleus production does not change with time. The transition temperature varies with the material of the surface and is not always associated with the onset of incandescence. The nuclei produced at the lower temperatures have a radius of about 10−5 cm and, on production, are mainly uncharged. Electric light bulbs can produce appreciable numbers of these nuclei.
Zusammenfassung
Es wird über eine Untersuchung von geheizten Glas-, Metall-und Öloberflächen als Quelle von Kondensationskernen berichtet. Unterhalb einer gewissen Übergangstemperatur ist die Kernerzeugung unbeständig und sinkt bei fortgesetzter Heizung der Oberfläche auf null. Oberhalb dieser Temperatur ändert sich die Kernproduktion nicht mit der Zeit. Es wurde gefunden, dass sich die Übergangstemperatur mit dem Material der Oberfläche ändert und nicht immer mit dem Beginn des Glühens assoziiert ist. Die Kerne, welche bei den niedrigeren Temperaturen erzeugt werden, haben einen mittleren Radius von ungefähr 10−5 cm und sind bei ihrem Entstehen grösstenteils ungeladen. Elektrische Glühlampenkönnen eine beträchtliche Zahl dieser Kerne erzeugen.
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Note: The research reported in this document has been sponsored in part by the Office, Chief of Research and Development, U.S. Department of Army, through its European Office under Contract No. DA-91-508-EUC-194.
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O'Connor, T.C., Sharkey, W.P.F. & O'Brolchain, C. On condensation nuclei produced at heated surfaces. Geofisica Pura e Applicata 42, 109–116 (1959). https://doi.org/10.1007/BF02113395
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DOI: https://doi.org/10.1007/BF02113395