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- W178142999 abstract "This report presents the results of the analysis of the counter-current annular flow in a vertical pipe which consists of falling liquid film and upward gas flow. The major task was to compare the existing correlations for interfacial shear stress, entrainment inception and entrainment rate with the flooding data presently available. To this end a steady-state, adiabatic, one-dimensional, two-phase flow model has been developed. The formulation of the proposed model consists of a separated (or two fluid) flow analysis of liquid film and gas-droplet mixture; the droplets in the gas-droplet mixture in the pipe core have been treated by the drift-flux model. It was found that entrainment and interfacial shear correlations, originally developed for co-current flow, when applied to counter-current flow in this analysis, do not provide acceptable agreement with the data. Therefore, some modifications to those correlations to better predict the available counter-current data habe been suggested. Finally, the most recent released versions of TRAC-PF1 and RELAP5/MOD1 thermohydraulic codes were run and compared to the data for the case of counter-current flooding simulations. The results have shown that the codes are very conservative in counter-current flooding predictions. This was especially apparent for RELAP5/MOD1 which could not predict the Universitymore » of Houston Flooding Tests. The test section had a thin film annular regime while the code assumed a droplet regime and so it was unable to predict the counter-current flow.« less" @default.
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- W178142999 date "1986-09-01" @default.
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- W178142999 title "Analysis of counter-current adiabatic flow limitation phenomenon in vertical pipes" @default.
- W178142999 hasPublicationYear "1986" @default.
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