Experimental investigations are reported for gas-liquid two-phase flow through 2.15 mm circular minichannel. Influence of premixing of air-water two-phase flow through T-junction (TJ) and Y-junction (YJ) geometries is established. Vertical downward orientation (VDW) is selected for the experiments. Different flow patterns are observed and flow pattern maps are developed. The developed flow pattern maps are then compared with available literature. It is observed that inlet premixing play an important role for establishing the flow patterns and to develop flow pattern maps in VDW orientation.

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