TU Darmstadt / ULB / TUprints

Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch

Löwe, Jens-Michael ; Schremb, Markus ; Hinrichsen, Volker ; Tropea, Cameron (2021):
Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch. (Publisher's Version)
In: Atmospheric Measurement Techniques, 14 (1), pp. 223-238. Copernicus Publications, ISSN 1867-8548,
DOI: 10.26083/tuprints-00019323,
[Article]

[img]
Preview
Text
amt-14-223-2021.pdf
Available under CC BY 4.0 International - Creative Commons, Attribution.

Download (5MB) | Preview
Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Experimental methodology and procedure for SAPPHIRE: a Semi-automatic APParatus for High-voltage Ice nucleation REsearch
Language: English
Abstract:

Ice nucleation is of great interest for various processes such as cloud formation in the scope of atmospheric physics, and icing of airplanes, ships, or structures. Ice nucleation research aims to improve the knowledge about the physical mechanisms and to ensure the safety and reliability of the respective applications. Several influencing factors like liquid supercooling or contamination with nucleants, as well as external disturbances such as an electric field or surface defects, affect ice nucleation. Especially for ice crystal formation in clouds and icing of high-voltage equipment, an external electric field may also have a strong impact on ice nucleation. Although ice nucleation has been widely investigated for numerous conditions, the effect of an electric field on ice nucleation is not yet completely understood; results reported in literature are even contradictory on some issues.

In the present study, an advanced experimental approach for the examination of ice nucleation in water droplets exposed to an electric field is described. It comprises a method for droplet ensemble preparation and an experimental setup, which allows observation of the droplet ensemble during its exposure to well-defined thermal and electric fields, which are both variable over a wide range. The entire approach aims at maximizing the accuracy and repeatability of the experiments in order to enable examination of even the most minor influences on ice nucleation. For that purpose, the boundary conditions the droplet sample is exposed to during the experiment are examined in particular detail using experimental and numerical methods. The methodological capabilities and accuracy have been demonstrated based on several ice nucleation experiments without an electric field, indicating almost perfect repeatability.

Journal or Publication Title: Atmospheric Measurement Techniques
Journal volume: 14
Number: 1
Publisher: Copernicus Publications
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems > High Voltage Technology
Date Deposited: 25 Aug 2021 12:19
Last Modified: 25 Aug 2021 12:19
DOI: 10.26083/tuprints-00019323
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-193239
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19323
Export:
Actions (login required)
View Item View Item