Comparative study on immersion freezing utilizing single-droplet levitation methods

Publication type:
Journal article
Metadata:
Autoren
  • Miklos Szakall
  • Michael Debertshaeuser
  • Christian Philipp Lackner
  • Amelie Mayer
  • Oliver Eppers
  • Karoline Diehl
  • Alexander Theis
  • Subir Kumar Mitra
  • Stephan Borrmann
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000626343100003&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-21-3289-2021
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: QT1HF
ISSN
1680-7316
Ausgabe der Veröffentlichung
5
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
3289 - 3316
Datum der Veröffentlichung
2021
Status
Published
Titel
Comparative study on immersion freezing utilizing single-droplet levitation methods
Sub types
  • Article
Ausgabe der Zeitschrift
21

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:p>Abstract. Immersion freezing experiments were performed utilizing two distinct single-droplet levitation methods. In the Mainz vertical wind tunnel, supercooled droplets of 700 µm diameter were freely floated in a vertical airstream at constant temperatures ranging from −5 to −30 ∘C, where heterogeneous freezing takes place. These investigations under isothermal conditions allow the application of the stochastic approach to analyze and interpret the results in terms of the freezing or nucleation rate. In the Mainz acoustic levitator, 2 mm diameter drops were levitated while their temperature was continuously cooling from +20 to −28 ∘C by adapting to the ambient temperature. Therefore, in this case the singular approach was used for analysis. From the experiments, the densities of ice nucleation active sites were obtained as a function of temperature. The direct comparison of the results from two different instruments indicates a shift in the mean freezing temperatures of the investigated drops towards lower values that was material-dependent. As ice-nucleating particles, seven materials were investigated; two representatives of biological species (fibrous and microcrystalline cellulose), four mineral dusts (feldspar, illite NX, montmorillonite, and kaolinite), and natural Sahara dust. Based on detailed analysis of our results we determined a material-dependent parameter for calculating the freezing-temperature shift due to a change in cooling rate for each investigated particle type. The analysis allowed further classification of the investigated materials to be described by a single- or a multiple-component approach. From our experiences during the present synergetic studies, we listed a number of suggestions for future experiments regarding cooling rates, determination of the drop temperature, purity of the water used to produce the drops, and characterization of the ice-nucleating material. The observed freezing-temperature shift is significantly important for the intercomparison of ice nucleation instruments with different cooling rates. </jats:p>
Autoren
  • Miklós Szakáll
  • Michael Debertshäuser
  • Christian Philipp Lackner
  • Amelie Mayer
  • Oliver Eppers
  • Karoline Diehl
  • Alexander Theis
  • Subir Kumar Mitra
  • Stephan Borrmann
DOI
10.5194/acp-21-3289-2021
eISSN
1680-7324
Ausgabe der Veröffentlichung
5
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2021
Paginierung
3289 - 3316
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-21-3289-2021
Datum der Datenerfassung
2021
Titel
Comparative study on immersion freezing utilizing single-droplet levitation methods
Ausgabe der Zeitschrift
21

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