Onsets of entrainment during dual discharge from a stratified two-phase region through horizontal branches with centrelines falling in an inclined plane: Part 2 – Experiments on gas and liquid entrainment

An experimental investigation has been conducted for determining the critical height and the location for the onset of gas and liquid entrainment during dual discharge from a stratified air–water region through branches mounted on a vertical wall. The two branches are horizontal, have circular cross-section (6.35 mm i.d.), and their centrelines fall in a common plane with variable inclinations from the horizontal. Effects of the separating distance between the branches, the flow rates through the branches, and the inclination angle of the plane containing the centrelines of the branches on the critical height and the location of the onset of both phenomena are presented and discussed. Comparisons between the present data of liquid entrainment and the finite-branch analysis presented in Part 1of this paper show good agreement.