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The present study investigates the flow pattern characteristics of air-water co-current down-flow in millichannels. The experiments have been performed in glass tube of diameter 0.0042 and 0.008 m. The fluids are injected through  Y  entry the included angle between the  Y  arms being 45 ° , 90 ° , 135 ° , and 180 °  ( T  Entry). The investigation reveals that the flow patterns are function of tube-diameter, and angle of fluid entry. Interestingly, stratified flow has been observed for steeper  Y  entry section at low liquid flow rates.

Gas-liquid downward flow through narrow vertical conduits: effect of angle of entry and tube-diameter on flow patterns