Modelling the growth of large rime ice accretions

Lasse Makkonen, Zhang Jian, Timo Karlsson, Mikko Tiihonen

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    The conventional theory of droplet collision with an object can be used only down to a collision efficiency of about 0.1. Therefore, no accurate modelling of in-cloud icing has been possible when droplets are small, wind speed is low, or the object is large. This has also put a limit on the size of an ice accretion on e.g. a power line cable up to which its growth can be simulated. We utilize results of icing wind tunnel experiments and fluid dynamics simulations to explain the differences between the experiments and the theory when the collision efficiency is small. We confirm that the history term in the droplet trajectory equations becomes relevant at small collision efficiencies. Including this term, and applying the integral over the size distribution instead of using themedian volume diameter, shows that accurate modelling of icing at very small collision efficiencies is feasible. This makes it possible to estimate large rime ice loads relevant to structural design.
    Original languageEnglish
    Pages (from-to)133-137
    JournalCold Regions Science and Technology
    Volume151
    DOIs
    Publication statusPublished - Jul 2018
    MoE publication typeA1 Journal article-refereed

    Keywords

    • ice accretion
    • rime ice
    • collision efficiency
    • history term
    • droplet distribution

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