TY - JOUR
T1 - A novel water droplet size parameter for calculation of icing on power lines
AU - Zhang, Jian
AU - He, Qing
AU - Makkonen, Lasse
N1 - Funding Information:
The Fund from China Scholarship Council ( 201606730024 ) is greatly acknowledged by the first author. This work is also supported by the Fundamental Research Funds for the Central Universities of China ( 2015XS93 ). This work was also supported by the Nordic project FrontLines no. 245370 .
Publisher Copyright:
© 2018 Elsevier B.V.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/2
Y1 - 2018/2
N2 - Collision efficiency is an important parameter for an icing prediction model. It mainly depends on wind velocity, conductor diameter and water droplet diameter. However, water droplets have a spectrum of sizes, which makes the task of calculating the overall collision efficiency time consuming. Therefore, some representative droplet sizes have been used, such as the median volume diameter. In this paper, a novel representative droplet diameter is presented for the calculation of the collision efficiency. The results are compared with those using the median volume diameter and the entire droplet size spectrum. The results show that this parameterization provides a more stable approximation than the median volume diameter when the collision efficiency changes, and is more appropriate when the collision efficiency is small. Mathematical explanation for this is given, and the limitation of this method is discussed.
AB - Collision efficiency is an important parameter for an icing prediction model. It mainly depends on wind velocity, conductor diameter and water droplet diameter. However, water droplets have a spectrum of sizes, which makes the task of calculating the overall collision efficiency time consuming. Therefore, some representative droplet sizes have been used, such as the median volume diameter. In this paper, a novel representative droplet diameter is presented for the calculation of the collision efficiency. The results are compared with those using the median volume diameter and the entire droplet size spectrum. The results show that this parameterization provides a more stable approximation than the median volume diameter when the collision efficiency changes, and is more appropriate when the collision efficiency is small. Mathematical explanation for this is given, and the limitation of this method is discussed.
KW - ice accretion
KW - collision efficiency
KW - water droplet diameter
KW - size spectrum
KW - median volume diameter
UR - http://www.scopus.com/inward/record.url?scp=85042619531&partnerID=8YFLogxK
U2 - 10.1016/j.coldregions.2018.01.021
DO - 10.1016/j.coldregions.2018.01.021
M3 - Article
VL - 149
SP - 65
EP - 70
JO - Cold Regions Science and Technology
JF - Cold Regions Science and Technology
SN - 0165-232X
ER -