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- W2414447776 abstract "Turbulent single-phase, and two-phase (air and water droplets) jet impingement cases are calculated and analyzed for a variety of configurations and input and boundary conditions including jet Reynolds number (Re{sub w}), non-dimensional distance to target wall (H/W), inlet turbulence intensity, droplet size and injection velocity, and loading ratio. A finite control volume method is used with a two-layer turbulence model for solving the continuous phase flow parameters, and a trajectory approach is used to make two-phase flow calculations. For the single-phase cases examined, a secondary rise in Nusselt number was seen for higher H/W values or larger Reynolds numbers. This secondary peak diminishes and shifts to higher x/2H as H/W is decreased, consistent with the empirical data. Significant enhancement to heat transfer (up to over 3 times that of the corresponding single-phase case) was observed with the introduction of droplets. The significant contributors to the enhanced heat transfer were determined to be the heat-sink provided for the continuous phase, increased continuous phase mass flow rate due to vapor generation, and momentum-induced changes in the flow-field. Wall-to-droplet heat transfer and lift forces were not significant for the set of conditions examined. A reduction in loading ratio substantially reduced heat transfer, andmore » variation of initial injection velocity for small droplets did not have an effect due to the relatively short aerodynamic response time.« less" @default.
- W2414447776 created "2016-06-24" @default.
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- W2414447776 date "1999-07-01" @default.
- W2414447776 modified "2023-09-22" @default.
- W2414447776 title "Turbulent single-phase and two-phase semi-confined jet impingement heat transfer predictions" @default.
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