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Measurements and simulations of the near-surface composition of evaporating ethanol-water droplets.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Homer, Christopher J. Jiang, Xingmao Ward, Timothy L. Brinker, C. Jeffrey Reid, Jonathan P. |
| Copyright Year | 2009 |
| Abstract | The evolving composition of evaporating ethanol-water droplets (initially 32.6 or 45.3 microm radius) is probed by stimulated Raman scattering over the period 0.2 to 3 ms following droplet generation and with a surrounding nitrogen gas pressure in the range 10 to 100 kPa. The dependence of the evaporation rate on the relative humidity of the surrounding gas phase is also reported. The measured data are compared with both a quasi-steady state model and with numerical simulations of the evaporation process. Results from the numerical simulations are shown to agree closely with the measurements when the stimulated signal is assumed to arise from an outer shell with a probe depth of 2.9+/-0.4% of the droplet radius, consistent with a previous determination. Further, the time-dependent measurements are shown to be sensitive to the development of concentration gradients within evaporating droplets. This represents the first direct measurement of the spatial gradients in composition that arise during the evaporation of aerosol droplets and allows the influence of liquid phase diffusion within the condensed phase on droplet evaporation to be examined. |
| Starting Page | 169 |
| Ending Page | 174 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.unm.edu/~solgel/PublicationsPDF/2009/HomerPCCP2009.pdf |
| PubMed reference number | 19727484v1 |
| Alternate Webpage(s) | https://doi.org/10.1039/b904070f |
| DOI | 10.1039/b904070f |
| Journal | Physical chemistry chemical physics : PCCP |
| Volume Number | 11 |
| Issue Number | 36 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Aerosol Dose Form Assumed Chromosome Condensation Ethanol Exposure to Humidity Kilopascal evaporation nitrogen gas |
| Content Type | Text |
| Resource Type | Article |
