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Ice Nucleation in the Presence of Electric Fields: An Experimental Study

Löwe, Jens-Michael and Schremb, Markus and Hinrichsen, Volker and Tropea, Cameron (2019):
Ice Nucleation in the Presence of Electric Fields: An Experimental Study.
Minneapolis, USA, In: SAE International Conference on Icing of Aircraft, Engines, and Structures, Minneapolis, USA, 17.06.2019-21.06.2019, DOI: 10.4271/2019-01-2020,
[Online-Edition: https://www.sae.org/publications/technical-papers/content/20...],
[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 and Schremb, Markus and Hinrichsen, Volker and 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...
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