Onsets of entrainment during dual discharge from a stratified two-phase region through horizontal branches with centrelines falling in an inclined plane: Part 1 - Analysis of liquid entrainment

A theoretical investigation has been conducted for predicting the critical liquid height and the location of liquid entrainment during dual discharge from a stratified two-phase region through branches mounted on a vertical w all. The two branches are horizontal and their centrelines fall in a common inclined plane. Two models have been developed; a simplified point-sink mo del and a more-accurate finite-branch model. Predictions from the two model s are shown to be in good agreement for the condition of high flow rates fr om the branches, while the finite-branch model is necessary for good predic tions at low branch flow rates. Influences of the various independent param eters on the predicted onset are presented and discussed. Comparisons with experimental results are shown in Part 2 of this paper. (C) 2001 Elsevier S cience Ltd. Ail rights reserved.