Abstract: In consideration of the bubble in the film of annular flow and the droplet in the gas core, the previous model of Smith has been modified in order to predict the void fraction in horizontal pipes more accurately. During the gas quality range of 0.048 5~0.796 0, as to Smith model, the void fraction prediction error of stratified flow and annular flow was 29.2% and 18.6% respectively. On the contrary, as to stratified flow, the corresponding prediction error of the modified model was 10.89% and in annular flow the prediction error was 13.3%. The experimental results showed that the prediction accuracy was improved greatly compared with Smith model.

Key words: Void fraction,    , Modified model,    ,  Horizontal pipe,   , Gasliquid twophase flow

摘要： 考虑了环状流液膜中含有气泡, 气芯中夹带液滴的情况, 根据S m i t h的环状流液膜动能与中间气芯动 能相等的假设, 提出了一个改进的截面含气率预测模型。实验结果表明, 对于水平管空气 - 水两相流, 在质量含气率 为0. 0 4 85~0. 7 9 60, S m i t h模型对于分层流误差为2 9. 2%, 环状流误差为1 8. 6%, 而改进模型对于分层流预测误差 1 0. 8 9%, 环状流误差为1 3. 3%, 大大提高了S m i t h模型的预测精度。

关键词: 含气率, 改进模型, 水平管, 气液两相流