Estimation of Time to Maximum Supercooling during Dynamic Frazil Ice Formation
Time to maximum supercooling is a parameter that can be easily measured during experiments on the dynamic, nonequilibrium stage of frazil ice formation. Mercier has determined an analytical expression for the time to maximum supercooling that depends only on the four basic system parameters: the rat...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
| Published: |
1989
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| Online Access: | http://www.dtic.mil/docs/citations/ADA212204 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA212204 |
| Summary: | Time to maximum supercooling is a parameter that can be easily measured during experiments on the dynamic, nonequilibrium stage of frazil ice formation. Mercier has determined an analytical expression for the time to maximum supercooling that depends only on the four basic system parameters: the rates of heat loss, seeding, turbulent dissipation and secondary nucleation. Mercier's analytical expression is applied to a number of experiments, the heat loss rate and turbulent dissipation rate were reported or could be determined from the experiment description. The secondary nucleation was set at the value of 4x10 to the 10th power nuclei/erg suggested by Mercier, and the seeding rate optimized to reproduce the experimental results, An inverse relationship was found between the coldroom temperature at which, the experiment was conducted and the seeding rate. The optimized seeding rates varied from 2.7. to 7.5x.00001 crystals/sq cm s. The implications for frazil ice formation in rivers and streams are discussed. |
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