微小T型三通中弹环状流的相分配实验与理论建模

Theoretical Modeling and Experimental Study of Slug-Annular Gas-Liquid Flow Splitting at a Micro-T-Junction

本文以氮气和水作为流动工质,对弹环状流在水平等径T型三通(D=0 5 mm)中的相分配特性进行了研究。结果发现,在实验范围内,大部分数据点都位于气相富集区,表明在弹环状流下,气体相比与液体更容易进入侧支管,而且增加液体表观速度或者减少气体表观速度,都会使得液体更多地进入直通支管,导致气液两相流的分配更不均匀。在实验的基础上,还建立了预测相分配的经验关联式。将实验结果与模型预测值进行比较之后,发现两者吻合较好,最大误差为8.76%。

The present work studies the phase splitting characteristics of slug-annular water-nitrogen flow at a horizontal T-junction with diameter of 500μm. The test results show that most of the data are located in gas rich zone, which reveals that gas tends to flow preferentially into the side arm. Increasing the liquid superficial velocity or decreasing the gas superficial velocity there will be more liquid through the run arm, and the degree of phase real-distribution will become larger. Fhrthermore, an empirical model based on the experiment data is proposed to predict the phase distribution for micro-T-junctions. Comparisons the predictions with experimental data show good agreement, and the maximal error is 8.76%.