Time-dependant Behaviour of Ice Accretion on a Non-rotating Cylinder PDF Download

Author: Bruno Q. de Lorenzis
Publisher:
ISBN:
Category : Icing (Meteorology)
Languages : en
Pages : 0

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Book Description
A model for ice accretion on a cylinder in a water-droplet cloud has been extended to include time-dependence of the growth of the accretion, through empirical methods. To this end 12 experiments were performed with the following range of atmospheric parameters; temperature from -5 to -10 C, liquid water content from .69 to 2.13 g m and airspeed from 15-45 m sec. A "shield technique was devised to facilitate the analysis of the time-dependent behaviour of growth. It was found that the model consistently underpredicted the growth rate by a factor of two compared to the observed growth rate at corresponding atmospheric conditions. The prediction of the shape of the accretion was found to be substantially improved when the direction of growth was taken to be that inferred from the "bubble lines" present in the accretion rather than the simpler method of radial growth. Discrepancies in the predicted mass and shape were deemed to be at least partially due to the exclusion of spongy ice from the model.