Köbschall, Kilian ; Traut, Benjamin ; Roisman, Ilia V. ; Tropea, Cameron ; Hussong, Jeanette (2023)
Melting of fractal snowflakes: Experiments and modeling.
In: International Journal of Heat and Mass Transfer, 212
doi: 10.1016/j.ijheatmasstransfer.2023.124254
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Numerical simulations of snow accretion on aircraft or weather phenomena require an accurate prediction of the melting of snowflakes. In the present study, an experimental setup for the investigation of snowflake melting is presented, which utilizes an acoustic levitator holding a snowflake in a warm airflow. Based on the experimental findings, a theoretical model for the melting process is developed. This theoretical model takes into account that the generated liquid water is driven into the porous ice structure by capillary forces and does not accumulate at the outer surface of the snowflake. This enables the use of a mass–size relationship in form of a power law, which is common in atmospheric sciences. The model prediction of the evolution of the maximum dimension during melting agrees well with the experiments. Moreover, the snowflake melting durations are also estimated well, if an accurate value is available for the particle mass fractal dimension, i.e., the exponent in the mass–size power law.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Köbschall, Kilian ; Traut, Benjamin ; Roisman, Ilia V. ; Tropea, Cameron ; Hussong, Jeanette |
| Art des Eintrags: | Bibliographie |
| Titel: | Melting of fractal snowflakes: Experiments and modeling |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | International Journal of Heat and Mass Transfer |
| Jahrgang/Volume einer Zeitschrift: | 212 |
| DOI: | 10.1016/j.ijheatmasstransfer.2023.124254 |
| Kurzbeschreibung (Abstract): | Numerical simulations of snow accretion on aircraft or weather phenomena require an accurate prediction of the melting of snowflakes. In the present study, an experimental setup for the investigation of snowflake melting is presented, which utilizes an acoustic levitator holding a snowflake in a warm airflow. Based on the experimental findings, a theoretical model for the melting process is developed. This theoretical model takes into account that the generated liquid water is driven into the porous ice structure by capillary forces and does not accumulate at the outer surface of the snowflake. This enables the use of a mass–size relationship in form of a power law, which is common in atmospheric sciences. The model prediction of the evolution of the maximum dimension during melting agrees well with the experiments. Moreover, the snowflake melting durations are also estimated well, if an accurate value is available for the particle mass fractal dimension, i.e., the exponent in the mass–size power law. |
| Zusätzliche Informationen: | Artikel-ID: 124254 |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) |
| TU-Projekte: | EC/H2020|824310|ICE GENESIS |
| Hinterlegungsdatum: | 26 Jun 2023 06:12 |
| Letzte Änderung: | 26 Jun 2023 06:12 |
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