In this paper, the behavior of nitrogen-water two-phase flow at a horizontal miniature T-junction with main and side branch of 500 μm diameter was studied. When the inlet flow pattern is slug-annular, the impact of upstream gas and liquid superficial velocity on phase distribution of two-phase flow in the miniature T-junction were investigated in detail. It is found that increasing liquid superficial velocity slightly increase the maldistribution at this work scope. Gas superficial velocity has complex impact on the maldistribution due to different proportion of sub-patterns, and pressure has no impact on phase distribution.

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