On the growth of homogeneously nucleated water droplets in nitrogen : an experimental study

M.A.L.J. Fransen, E. Sachteleben, J. Hruby, D.M.J. Smeulders

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

A pulse-expansion wave tube method to determine homogeneous nucleation rates of water droplets has been improved. In particular, by accounting for background scattering, the experimental light scattering can be fitted extremely well with the Mie scattering theory. This results in an accurate determination of the droplet growth curve, which is well defined owing to the sharp monodispersity of the droplet cloud generated by the nucleation pulse method. With this method, water condensation is effectively decoupled in birth (nucleation) and growth of droplets. Droplet growth curves yield information on the diffusion coefficient, which only depends on pressure and temperature and on the supersaturation of the individual experiments. Here, we propose to use this information in the interpretation of nucleation rate data. Experimental results are given for homogeneous nucleation rates of supercooled water droplets at nucleation temperature 240 K and pressure 1.0 MPa and for growth of supercooled water droplets at temperature 247 K and pressure 1.1 MPa. The supersaturation was varied between 10 and 14, resulting in nucleation rates varying between 10 m s and 10 m s . For the diffusion coefficient, a value of 1.51 0.03 mm s was found (247 K, 1.1 MPa) in agreement with previously reported results. It is discussed how the information from droplet growth data can be used to assess the quality of the individual water nucleation experiments.
LanguageEnglish
Article number1780
Pages1780-1/17
Number of pages17
JournalExperiments in Fluids
Volume55
Issue numberJuly
DOIs
StatePublished - 2014

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Nucleation
Nitrogen
nucleation
nitrogen
Water
water
Supersaturation
supersaturation
diffusion coefficient
Scattering
Information use
Mie scattering
curves
pulses
elastic waves
Light scattering
Temperature
temperature
Condensation
light scattering

Cite this

Fransen, M.A.L.J. ; Sachteleben, E. ; Hruby, J. ; Smeulders, D.M.J./ On the growth of homogeneously nucleated water droplets in nitrogen : an experimental study. In: Experiments in Fluids. 2014 ; Vol. 55, No. July. pp. 1780-1/17
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On the growth of homogeneously nucleated water droplets in nitrogen : an experimental study. / Fransen, M.A.L.J.; Sachteleben, E.; Hruby, J.; Smeulders, D.M.J.

In: Experiments in Fluids, Vol. 55, No. July, 1780, 2014, p. 1780-1/17.

Research output: Contribution to journalArticleAcademicpeer-review

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