Zero gravity two-phase flow regime transition modeling compared with data and relap5-3d predictions

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Title: Zero gravity two-phase flow regime transition modeling compared with data and relap5-3d predictions
Author: Ghrist, Melissa Renee
Abstract: This thesis compares air /water two -phase flow regime transition models in zero gravity with data and makes recommendations for zero gravity models to incorporate into the RELAP5 -3D thermal hydraulic computer code . Data from numerous researchers and experiments are compiled into a large database . A RELAP5 -3D model is built to replicate the zero gravity experiments , and flow regime results from the RELAP5 -3D code are compared with data . The comparison demonstrates that the current flow regime maps used in the computer code do not scale to zero gravity . A new flow regime map is needed for zero gravity conditions . Three bubbly -to -slug transition models and four slug -to -annular transition models are analyzed and compared with the data . A mathematical method is developed using least squares to objectively compare the accuracy of the models with the data . The models are graded by how well each represents the data . Agreement with data validates the recommendations made for changes to the RELAP5 -3D computer code models . For smaller diameter tubes , Dukler ?s bubbly -to -slug model best fits the data . For the larger tubes , the Drift Flux model is a better fit . The slug -to -annular transition is modeled best by Creare for small tubes and Reinarts for larger tubes . A major finding of this thesis work is that more air /water data is needed at equally distributed flow velocities and a greater variety of tube diameters . More data is specifically needed in the predicted transition regions made in this study .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2353
Date: 2009-05-15

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Zero gravity two-phase flow regime transition modeling compared with data and relap5-3d predictions. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2353 .

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