It is needless to say the importance of doing research on multi-phase flows in micro- and mini-channels, which is clearly seen in the growing number of researchers in this field in recent years. We started about fifteen years ago to investigate on the gas-liquid two-phase flows in circular capillary tubes in order to get fundamental information with special attention on the flow patterns, the time varying hold-up and pressure loss. The directions of flow were vertical upward, horizontal and vertical downward. After that we also did research on the flows in rectangular mini channel in the similar experimental condition. In the present paper we will present and summarize these data.

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