Rogak, S. N. and Baltensperger, U. and Flagan, R. C. (1991) Measurement of Mass Transfer to Agglomerate Aerosols. Aerosol Science and Technology, 14 (4). pp. 447-458. ISSN 0278-6826. doi:10.1080/02786829108959505. https://resolver.caltech.edu/CaltechAUTHORS:20150805-111317219
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Abstract
The mass transfer to agglomerate titanium dioxide aerosols produced in a thermal reactor was measured and compared to the mass transfer for spheres of the same mobility. The material transferred to the particles was ultrafine radioactive lead clusters produced via the decay chain of ^(227)Ac. The lead attachment rate was measured with an epiphaniometer, a device that mixes a fixed concentration of radioactive lead atoms with the sample for a period of several minutes and then measures the quantity of lead attached to the particles. In the free-molecular regime, where the particle diameter is small compared with the mean free path of the gas and the diffusing species, previous studies have shown by theory and experiment that the mass transfer to an aerosol is inversely proportional to the particle mobility. This study showed that this is also true for particles in the transition regime, where the particle diameter is comparable to the mean free path. Further, the mass transfer rate is shown to be independent of particle shape for particles of the same mobility, at least when the mean free paths of the gas and the diffusing species are comparable.
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| Additional Information: | © 1991 American Association for Aerosol Research. Received July 16, 1990; accepted November 28, 1990. The authors gratefully acknowledge the financial support of the International Fine Particle Research Institute and the Swiss National Science Foundation. For the scanning electron microscopy we thank A. Portmann at the Institute for Inorganic Chemistry, University of Zurich, Switzerland. | |||||||||
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| Issue or Number: | 4 | |||||||||
| DOI: | 10.1080/02786829108959505 | |||||||||
| Record Number: | CaltechAUTHORS:20150805-111317219 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150805-111317219 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59222 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Irina Meininger | |||||||||
| Deposited On: | 05 Nov 2015 23:50 | |||||||||
| Last Modified: | 10 Nov 2021 22:17 |
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