A novel water droplet size parameter for calculation of icing on power lines

Jian Zhang, Qing He, Lasse Makkonen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalCold Regions Science and Technology
Volume149
DOIs
Publication statusPublished - Feb 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

power line
droplet
collision
Water
water
Parameterization
calculation
parameter
parameterization
wind velocity
prediction

Keywords

  • ice accretion
  • collision efficiency
  • water droplet diameter
  • size spectrum
  • median volume diameter

Cite this

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title = "A novel water droplet size parameter for calculation of icing on power lines",
abstract = "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.",
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A novel water droplet size parameter for calculation of icing on power lines. / Zhang, Jian; He, Qing; Makkonen, Lasse.

In: Cold Regions Science and Technology, Vol. 149, 02.2018, p. 65-70.

Research output: Contribution to journalArticleScientificpeer-review

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

PY - 2018/2

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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

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