The flow visualization experiments of nitrogen-water two-phase upward flow was carried out in a small rectangular channel ( w × h = 2 mm × 0.81 mm) and an equilateral triangular channel ( length of side 2 mm ) with the hydraulic diameter of 1.15 mm. The flow pattern map and flow pattern transition boundaries were obtained in the range of gas superficial velocities 0. 1-30 m/s and liquid superficial velocities 0.01-5 m/s. The comparison of the present results shows that in the case of the same hydraulic diameter, the cross section shape of small channels has remarkable effect on the flow pattern transition.%通过可视化手段对水力直径为1.15 mm的矩形小通道(w×h=2 mm×0.81 mm)和正三角形小通道(边长2 mm)内氮气-水气液二相绝热垂直向上流动进行了实验研究.在表观气速0.1-30 m/s和表观液速0.01-5 m/s范围内,由实验结果得到2种小通道内的氮气-水典型流型图和流型转变界限.通过对比实验结果发现,在水力直径相同的情况下,小通道的截面形状对流型转变界限有显著影响.
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