Annular flow in T-junctions with horizontal inlet and downwardly inclined branches

Experimental data on dividing steam-water two-phase annular flow in T-junctions having a horizontal inlet and downwardly inclined branches was obtained. The experiments were performed under high inlet mass flux conditions which have not been examined before. The data covered the inlet mass flux and inlet quality ranges of: 6001<900 kg/m²·s and 0.021<0.08, respectively. The branch orientation was found to be a significant parameter affecting phase separation under the present test conditions. This is caused by the non-uniform angular distribution of the liquid film thickness associated with the horizontal inlet annular flow. The pressure changes of two-phase flow in the junction were closely correlated with the phase separation phenomenon. The data on pressure rise in the run and pressure drop in the branch were correlated using simple models based on momentum and mechanical energy balances.