Summary
An account is given of a new instrument for determining the apparent diffusion coefficient of aerosols using the dynamic method in which a diffusion battery without end-pieces or connecting tubing is built into the fog-tube of a photo-electric condensation nucleus counter.
The elimination of the end-pieces and connecting tubings removes any end-effect and diffusion losses in these parts of the diffusion batteries used hitherto and reduces the volume of the diffusion apparatus to that of its channels, thus minimising the lag in the response of the battery.
A preliminary application of the instrument in room air confirmed previous findings that the apparent diffusion coefficient as determined by the dynamic method depends on the air-flow used.
Zusammenfassung
Es wird ein neues Instrument für die Bestimmung des virtuellen Diffusionskoeffizienten eines Aerosols mittels der dynamischen Methode beschrieben, bei welchem eine Diffusionsbatterie ohne Endstücke oder Verbindungsröhren direkt in das Nebelrohr eines photoelektrischen Kondensations-Kernzählers eingebaut ist.
Die Beseitigung der Endstücke und Verbindungsröhren schliesst jeglichen «Endeffekt» und Diffusionsverluste in diesen Teilen der bisher benützten Diffusionsbatterien aus und reduziert das Volumen des Diffusionsapparates auf jenes seiner Kanäle, wodurch die zur Anwendung der dynamischen Methode erforderliche Zeit wesentlich verkürzt wird.
Eine vorläufige Anwendung des Instrumentes in Laboratoriumluft bestätigt frühere Feststellungen, dass der virtuelle diffusionskoeffizient, wie er mittels der dynamischen Methode erhalten wird, von der benützten Luftstromgeschwindigkeit abhängt.
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The research reported in this article has been sponsored and supported in part by the Geophysics Research Directorate of the Air Force Cambridge Research Center, Air Research and Development Command, United States Air Force, under Contract No. AF 61(052)-26 and Supplemental Agreement No. 1, through the European Office, ARDC in Brussels.
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Pollak, L.W., Daly, J. A diffusion battery without end-pieces or connecting tubing. Geofisica Pura e Applicata 45, 249–257 (1960). https://doi.org/10.1007/BF01996591
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DOI: https://doi.org/10.1007/BF01996591