Experimental studies of droplet evaporation kinetics

Validation of models for binary and ternary aqueous solutions

Huiwen Xue, Alfred Moyle, Jr., Nathan Magee, Jerry Y. Harrington, Dennis Lamb

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Experiments w conducted with an electrodynamic levitation system to study the kinetics of droplet evaporation under chemically rich conditions. Single solution droplets of known composition (HNO3/H2O or H2SO4/HNO3/H2O) were introduced into an environmentally controlled cubic levitation cell. The gaseous environment was set intentionally out of equilibrium with the droplet properties, thus permitting the HNO3 mass accommodation coefficient to be determined. Measurements were performed at room temperature and various pressures (200-1000 hPa). Droplet sizes (initial radii in the range 12-26 μm) were measured versus time to high precision (±0.03 μm) via Mie scattering and compared with sizes computed by different models for mass and heat transfer in the transition regime. The best agreement between the theoretical calculations and experimental results was obtained for an HNO3 mass accommodation coefficient of 0.11 ± 0.03 at atmospheric pressure, 0.17 ± 0.05 at 500 hPa, and 0.33 ± 0.08 at 200 hPa. The determination of the mass accommodation coefficient was not sensitive to the transport model used. The results show that droplet evaporation is strongly limited by HNO3 and occurs in two stages, one characterized by rapid H2O mass transfer and the other by HNO3 mass transfer. The presence of a nonvolatile solute (SO42-) affects the activities of the volatile components (HNO3 and H2O) and prevents complete evaporation of the solution droplets. These findings validate recent attempts to include the effects of soluble trace gases in cloud models, as long as suitable model parameters are used.

Original languageEnglish (US)
Pages (from-to)4310-4326
Number of pages17
JournalJournal of the Atmospheric Sciences
Volume62
Issue number12
DOIs
StatePublished - Dec 1 2005

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droplet
experimental study
aqueous solution
evaporation
kinetics
mass transfer
electrodynamics
trace gas
atmospheric pressure
heat transfer
solute
scattering
experiment
temperature

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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title = "Experimental studies of droplet evaporation kinetics: Validation of models for binary and ternary aqueous solutions",
abstract = "Experiments w conducted with an electrodynamic levitation system to study the kinetics of droplet evaporation under chemically rich conditions. Single solution droplets of known composition (HNO3/H2O or H2SO4/HNO3/H2O) were introduced into an environmentally controlled cubic levitation cell. The gaseous environment was set intentionally out of equilibrium with the droplet properties, thus permitting the HNO3 mass accommodation coefficient to be determined. Measurements were performed at room temperature and various pressures (200-1000 hPa). Droplet sizes (initial radii in the range 12-26 μm) were measured versus time to high precision (±0.03 μm) via Mie scattering and compared with sizes computed by different models for mass and heat transfer in the transition regime. The best agreement between the theoretical calculations and experimental results was obtained for an HNO3 mass accommodation coefficient of 0.11 ± 0.03 at atmospheric pressure, 0.17 ± 0.05 at 500 hPa, and 0.33 ± 0.08 at 200 hPa. The determination of the mass accommodation coefficient was not sensitive to the transport model used. The results show that droplet evaporation is strongly limited by HNO3 and occurs in two stages, one characterized by rapid H2O mass transfer and the other by HNO3 mass transfer. The presence of a nonvolatile solute (SO42-) affects the activities of the volatile components (HNO3 and H2O) and prevents complete evaporation of the solution droplets. These findings validate recent attempts to include the effects of soluble trace gases in cloud models, as long as suitable model parameters are used.",
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Experimental studies of droplet evaporation kinetics : Validation of models for binary and ternary aqueous solutions. / Xue, Huiwen; Moyle, Jr., Alfred; Magee, Nathan; Harrington, Jerry Y.; Lamb, Dennis.

In: Journal of the Atmospheric Sciences, Vol. 62, No. 12, 01.12.2005, p. 4310-4326.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental studies of droplet evaporation kinetics

T2 - Validation of models for binary and ternary aqueous solutions

AU - Xue, Huiwen

AU - Moyle, Jr., Alfred

AU - Magee, Nathan

AU - Harrington, Jerry Y.

AU - Lamb, Dennis

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AB - Experiments w conducted with an electrodynamic levitation system to study the kinetics of droplet evaporation under chemically rich conditions. Single solution droplets of known composition (HNO3/H2O or H2SO4/HNO3/H2O) were introduced into an environmentally controlled cubic levitation cell. The gaseous environment was set intentionally out of equilibrium with the droplet properties, thus permitting the HNO3 mass accommodation coefficient to be determined. Measurements were performed at room temperature and various pressures (200-1000 hPa). Droplet sizes (initial radii in the range 12-26 μm) were measured versus time to high precision (±0.03 μm) via Mie scattering and compared with sizes computed by different models for mass and heat transfer in the transition regime. The best agreement between the theoretical calculations and experimental results was obtained for an HNO3 mass accommodation coefficient of 0.11 ± 0.03 at atmospheric pressure, 0.17 ± 0.05 at 500 hPa, and 0.33 ± 0.08 at 200 hPa. The determination of the mass accommodation coefficient was not sensitive to the transport model used. The results show that droplet evaporation is strongly limited by HNO3 and occurs in two stages, one characterized by rapid H2O mass transfer and the other by HNO3 mass transfer. The presence of a nonvolatile solute (SO42-) affects the activities of the volatile components (HNO3 and H2O) and prevents complete evaporation of the solution droplets. These findings validate recent attempts to include the effects of soluble trace gases in cloud models, as long as suitable model parameters are used.

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