A New Time-dependent Ice Accretion Model for Non-rotating Cylinders PDF Download
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Author: K. Szilder
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages :
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Author: K. Szilder
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages :
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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.
Author: K. Szilder
Publisher:
ISBN:
Category : Icing (Meteorology)
Languages : en
Pages : 86
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Author:
Publisher:
ISBN:
Category : Ice
Languages : en
Pages : 492
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Author: K. C. Cheng
Publisher: CRC Press
ISBN: 9780891169857
Category : Technology & Engineering
Languages : en
Pages : 824
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Book Description
This volume of papers has been produced in memory of Professor R.R. Gilpin, who was a pioneer in the field of freezing phenomena in ice-water systems. The subject has applications in ice formation in industrial plants, technologies for manufacturing crystals in space for semiconductors and computer chips and atmospheric physics and geophysics.
Author: Masoud Farzaneh
Publisher: Springer Science & Business Media
ISBN: 1402085311
Category : Technology & Engineering
Languages : en
Pages : 389
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Book Description
Atmospheric ice takes a wide range of fascinating forms, all beautiful in their own ways but many posing severe risk to the security of overhead networks for electric power, communications and other systems. This comprehensive book documents the fundamentals of atmospheric icing and surveys the state of the art in eight chapters, each written by a team of experienced and internationally renowned experts. The treatment is detailed and richly illustrated. The presentation follows a logical sequence, starting with the icing climate and meteorological conditions, proceeding through development of observations and models of accretion and release of ice and heavy snow, then considering static and dynamic mechanical loads, the effects of ice and snow on electrical insulation, de-icing, ice prevention and mitigation methods. The statistical analysis of icing data and the mathematical and numerical modelling support appropriate mechanical and electrical design processes for icing conditions on overhead lines. Technical specialists, researchers and students in engineering and environmental science will all find value throughout the text.
Author: Edward P. Lozowski
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 88
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Author:
Publisher:
ISBN:
Category : Cold regions
Languages : en
Pages : 108
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Author: M. Bain
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
Icing measurements were carried out in natural winter clouds with an instrumented wind tunnel set up at the top of the Puy de Dome (1500 MLS). The microphysical data (liquid water content, droplet spectra) were obtained by using the PMS ASSP 100. The ice density was measured on a rotating cylinder and the ice deposit of the cross section was photographed on a fixed cylinder. We propose to improve this model by taking into account the ice density variation with the angle of impact on the cylinder. The ice density variation with the angle depends on various parameters: pressure, temperature, air speed, liquid water content and especially on the droplet distribution. This improvement is not sufficient to explain some observed profiles; this may be attributed to the fact that the model is not time dependent.
Author:
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 336
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Book Description
