CFD modelling of two-phase discharge from a stratified region through a small side branch

Abstract

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.

Investigation on the Onset of Gas Entrainment by Experimental Simulation of Two Side Branches of PHWR Header Using Air and Water

“…Reference [8] and [9] developed theoretical model to predict the OGE during single discharge through a side branch installed on a vertical surface exposed to a smooth stratified region. Table 1compares the value of C 1 and C 2 obtained by earlier investigators through empirical and theoretical way with either vertical wall mounted or circular wall mounted branch.…”