Löwe, Jens-Michael ; Schremb, Markus ; Hinrichsen, Volker ; Tropea, Cameron (2019):
Ice Nucleation in the Presence of Electric Fields: An Experimental Study.
Minneapolis, USA, SAE International Conference on Icing of Aircraft, Engines, and Structures, Minneapolis, USA, 17.06.2019-21.06.2019, DOI: 10.4271/2019-01-2020,
[Conference or Workshop Item]
Abstract
In the present study, ice nucleation in sessile water droplets during continuous cool down is studied experimentally under the impact of electric fields to determine their influence on heterogeneous nucleation. The experimental setup enables simultaneous observation of multiple drops under well-defined conditions with and without an electric field, and at temperatures down to -40 °C. A single experimental run contains 40 drops exposed to the same conditions. Drops with a well-defined size are produced employing a drop-on-demand droplet generator. Based on multiple experimental runs using the same droplets, the nucleation behavior is analyzed using statistical methods to determine the drop survival curves and nucleation site densities for varying conditions. Besides the influence of the electric field, the influence of different droplet ensembles is investigated for a constant cooling rate of 5 K/min. A comparison of the experiments with and without an electric field is used to laborate its influence on heterogeneous ice nucleation.
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2019 |
| Creators: | Löwe, Jens-Michael ; Schremb, Markus ; Hinrichsen, Volker ; Tropea, Cameron |
| Title: | Ice Nucleation in the Presence of Electric Fields: An Experimental Study |
| Language: | English |
| Abstract: | In the present study, ice nucleation in sessile water droplets during continuous cool down is studied experimentally under the impact of electric fields to determine their influence on heterogeneous nucleation. The experimental setup enables simultaneous observation of multiple drops under well-defined conditions with and without an electric field, and at temperatures down to -40 °C. A single experimental run contains 40 drops exposed to the same conditions. Drops with a well-defined size are produced employing a drop-on-demand droplet generator. Based on multiple experimental runs using the same droplets, the nucleation behavior is analyzed using statistical methods to determine the drop survival curves and nucleation site densities for varying conditions. Besides the influence of the electric field, the influence of different droplet ensembles is investigated for a constant cooling rate of 5 K/min. A comparison of the experiments with and without an electric field is used to laborate its influence on heterogeneous ice nucleation. |
| Place of Publication: | Minneapolis, USA |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA) 18 Department of Electrical Engineering and Information Technology 18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems > High Voltage Technology 18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems DFG-Collaborative Research Centres (incl. Transregio) DFG-Collaborative Research Centres (incl. Transregio) > Transregios DFG-Collaborative Research Centres (incl. Transregio) > Transregios > TRR 75 Droplet Dynamics Under Extreme Ambient Conditions |
| Event Title: | SAE International Conference on Icing of Aircraft, Engines, and Structures |
| Event Location: | Minneapolis, USA |
| Event Dates: | 17.06.2019-21.06.2019 |
| Date Deposited: | 06 Jun 2019 06:14 |
| DOI: | 10.4271/2019-01-2020 |
| Official URL: | https://www.sae.org/publications/technical-papers/content/20... |
| Corresponding Links: | |
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