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| Titel |
Validation of the poke-flow technique combined with simulations of fluid flow for determining viscosities in samples with small volumes and high viscosities |
| VerfasserIn |
J. W. Grayson, M. Song, M. Sellier, A. K. Bertram |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-16), S.2463-2472 |
| Datensatznummer |
250116433
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| Publikation (Nr.) |
 copernicus.org/amt-8-2463-2015.pdf |
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| Zusammenfassung |
| Viscosity in particles consisting of secondary organic material (SOM) has
recently become an area of research focus, since information on viscosity is
needed to predict the environmental impacts of SOM particles. Recently
Renbaum-Wolff et al. (2013a) developed a poke-flow technique that was combined
with simulations of fluid flow to constrain the viscosities of SOM samples of
1–5 mg mass, roughly the maximum that may be collected from environmental
chambers or flow tubes on a reasonable timescale. The current manuscript
expands on the initial validation experiments carried out by Renbaum-Wolff et
al. First, the poke-flow technique combined with simulations of fluid flow
was used to determine the viscosity of sucrose–water particles over a
relatively wide range of relative humidities (RHs). The lower and upper
limits of viscosity at 59% RH were 1.0 × 101 and
1.6 × 104 Pa s, whilst at 37% RH the corresponding values
were 7.2 × 104 and 4.7 × 106 Pa s, respectively.
The results are in good agreement with recent measurements by
Quintas et al. (2006) and Power et al. (2013). Second, the approach was used
to determine the viscosity of two polybutene standards. The simulated lower
and upper limits of viscosity for standard #1 was 2.0 × 102 and
1.2 × 104 Pa s, whilst for standard #2 the corresponding
values were 3.1 × 102 and 2.4 × 104 Pa s. These
values are in good agreement with values reported by the manufacturer. The
results for both the sucrose–water particles and the polybutene standards
show that the poke-flow technique combined with simulations of fluid flow is
capable of providing both lower and upper limits of viscosity that are
consistent with literature or measured values when the viscosity of the
particles are in the range of
≈ 5 × 102 to ≈ 3 × 106 Pa s. |
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