Abstract
Two-phase discharge from headers has relevance to many industrial applications, particularly in nuclear-safety analysis during postulated loss-of-coolant accidents. The main objective of this study is to assess the ability of commercial CFD codes in predicting the flow phenomena and flow parameters associated with two-phase discharge from a stratified region through a small side branch. Results were obtained for the critical heights at the onsets of gas and liquid entrainment, as well as the mass flow rate and quality during two-phase discharge. All results are in good agreement with existing experimental data. However, the computation time required to obtain these results was found to be excessive.
Highlights
Two-phase discharge from a stratified region through single or multiple branches has relevance to many industrial applications
If the branch is located below the horizontal interface, gas can be pulled through the branch
The objective of the present study is to develop numerical models for predicting the critical heights at the OLE and OGE, as well as the mass flow rate and quality in the two-phase region and to validate the numerical results in terms of magnitude and trend against existing experimental data
Summary
Two-phase discharge from a stratified region through single or multiple branches has relevance to many industrial applications. Several experimental (e.g., Micaelli and Memponteil [2];Yonomoto and Tasaka [3]; Hassan et al [4]) and theoretical (e.g., Craya [5]; Soliman and Sims [6]; Saleh et al [7]) investigations were reported for the determination of the critical heights of the interface at the OLE and OGE. These studies produced the following formulation for both critical heights:. The objective of the present study is to develop numerical models for predicting the critical heights at the OLE and OGE, as well as the mass flow rate and quality in the two-phase region and to validate the numerical results in terms of magnitude and trend against existing experimental data
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