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DTIC ADA071809: Laminar and Turbulent Boundary Layers Adjacent to M... |
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by Defense Technical Information Center |
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A laboratory study of melting vertical ice sheets |
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immersed in sodium chloride solutions of oceanic |
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temperatures and salinities found that the convective |
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motions generated by the melting consist of two regions |
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confined to a boundary layer adjacent to the ice. The |
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first region, at the bottom of the ice, is laminar and |
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bidirectional, with a 2 to 3 mm thick upward flowing |
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layer next to the ice inside of a 10 mm thick outer |
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downward flowing layer. This bidirectionality results |
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from the large difference between the thermal and saline |
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diffusivities which contain dilute water near the ice and |
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allows the cooling to diffuse further from the ice. Near |
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the ice, dilute cold water rises; while away from the |
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ice, cold saline water sinks. Second, further up the ice, |
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the inner layer goes through a region of transition and |
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becomes fully turbulent when the saline Grashof number |
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reaches 2 x 10 to the 8th power. The turubulent flow is |
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upward, unidirectional and the dominant flow in the |
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oceans. |
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Date Published: 2017-09-22 06:00:17 |
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Identifier: DTIC_ADA071809 |
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Item Size: 146305797 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Josberger,Edward George... |
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