946 resultados para Available transfer capacity
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Mode of access: Internet.
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Cover title.
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Item 1070-M
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Item 1070-M
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Item 1070-M
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"December 1990."
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"Purdue Research Foundation. Research Project no. 1717. Project Ae-33. This research was supported by the McDonnell Aircraft Corporation under Contract no. 6140-20 P.O. 7S4899-R."
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"A report on a conference at Zion, Illinois, which was supported by the Research Applications Directorate of the National Science Foundations, grant GI-30971".
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Includes bibliographical references (p. 15)
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"Purdue Research Foundation. Research project no.1717. Project Ae-33. This research was supported by the McDonnell Aircraft Corporation under Contract no. 6140-20 P. O. 7S4899-R."
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Mode of access: Internet.
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"March 1985."
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Large-eddy simulation is used to predict heat transfer in the separated and reattached flow regions downstream of a backward-facing step. Simulations were carried out at a Reynolds number of 28 000 (based on the step height and the upstream centreline velocity) with a channel expansion ratio of 1.25. The Prandtl number was 0.71. Two subgrid-scale models were tested, namely the dynamic eddy-viscosity, eddy-diffusivity model and the dynamic mixed model. Both models showed good overall agreement with available experimental data. The simulations indicated that the peak in heat-transfer coefficient occurs slightly upstream of the mean reattachment location, in agreement with experimental data. The results of these simulations have been analysed to discover the mechanisms that cause this phenomenon. The peak in heat-transfer coefficient shows a direct correlation with the peak in wall shear-stress fluctuations. It is conjectured that the peak in these fluctuations is caused by an impingement mechanism, in which large eddies, originating in the shear layer, impact the wall just upstream of the mean reattachment location. These eddies cause a 'downwash', which increases the local heat-transfer coefficient by bringing cold fluid from above the shear layer towards the wall.