关键词: 大管径, 界面面积浓度, 两相流

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