Abstract: The distribution profile of Interfacial Area Concentration (IAC) of air-water two-phase flow in vertical pipes has been conducted by using the measurement technique of optical fiber probes. The diameter of the large and transitional tubes is 100mm and 50mm, respectively. Superficial gas and liquid velocity ranges from 0.01 to 1.0 m?s-1 and from 0 to 1.0 m?s-1, accordingly. Firstly, on the basis of evaluating its measurement accuracy, the optical probe was calibrated by comparing its measurement result with the photographic data obtained by high-speed videos. The radial profiles of IAC and sauter mean diameter (bubble diameter) were then gained by experiments. And the effect of tube size on IAC and bubble behavior was obtained by analysis of the distribution properties of IAC and bubble diameter in the two tubes, Several models for calculating IAC were evaluated against experimental results, in the meantime, a more accurate correlation for calculating IAC based on the Hibiki-Ishii ( 2002) model was proposed by fitting the experimental data.

Key words: large diameter pipe, interfacial area concentration, twophase flow

摘要： 采用光纤探针测量方法对垂直上升管中空气-水两相流动的界面面积浓度（IAC）分布规律进行了研究。实验选用圆管直径为100mm和50mm(分别属于大管径和过渡管径范围)。气相、液相表观速度的范围分别为 0.01～1.0 m?s-1和 0～1.0 m?s-1。首先通过高速摄影获取的影像数据对光纤探针法的测量精度进行评价,并在此基础上对光纤测量方法进行了标定，然后利用实验获得了IAC、索特平均直径（气泡直径）径向分布情况。通过对比分析两个圆管管内IAC、气泡直径分布特点，得到了管径的尺度效应对IAC及气泡行为的影响规律。利用获得的IAC数据，对几类IAC计算模型进行了评价，并基于Hibiki-Ishii（2002）模型，通过实验数据拟合，得到了更高计算精度的IAC计算关联式。

关键词: 大管径, 界面面积浓度, 两相流