Laboratory Investigation of Trash Rack Freezeup by Frazil Ice

A series of tests was conducted in a refrigerated flume facility to determine the ice accumulation pattern on models of water intake trash racks. Data gathered included the flow velocity, the water temperature and the porosity of the accumulated frazil ice (mean porosity is 0.67). Frazil accumulates...

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Bibliographic Details
Main Authors: Andersson, Annika, Daly, Steven F.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1992
Subjects:
Snow
Ice and Permafrost
*ICE FORMATION
VELOCITY
TEMPERATURE
MODELS
POROSITY
ICE
FLOW
BLOCKING
ACCUMULATION
WATER FILTERS
BRIDGES
MEAN
RODS
PATTERNS
SURFACES
WATER
FACILITIES
SHAPE
*FRAZIL ICE
*TRASH RACKS
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA258120
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA258120
Description
Summary:A series of tests was conducted in a refrigerated flume facility to determine the ice accumulation pattern on models of water intake trash racks. Data gathered included the flow velocity, the water temperature and the porosity of the accumulated frazil ice (mean porosity is 0.67). Frazil accumulates first on the upstream face of the trash rack bars (being insensitive to bar shape), and then bridges between individual bars near the water surface, proceeding downward until the entire trash rack is blocked. Flow through the rack became highly nonuniform during the accumulation process.

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