竖直小通道内弹状流气弹长度的计算模型

Calculation Model of Slug Length for Slug Flow in Vertical Small Channel

摘要: 针对小通道内弹状流建立了气弹长度计算模型，并结合实验研究，对模型进行验证。可视化实验以空气和水为工质，矩形通道截面尺寸为3.25 mm×43 mm，分气、液相Re范围分别为62~360和1255~3707。结果显示，模型的预测值与实验数据具有较好的一致性，平均绝对误差为26.8%。此外，将Mishima和Cheng等的实验数据与计算模型进行对比，实验段包括矩形通道（40 mm×1.07 mm，40 mm×2.45 mm）和圆形通道（D_e=4 mm），平均绝对误差为34.9%，说明计算模型具有较好的适用性。

Abstract: A calculation model of slug length was developed for slug flow in small channels and verified by visualized experiments of air-water slug flow in a vertical rectangular channel with the cross section area of 3.25 mm×43 mm. Reynolds numbers of air and water were in the ranges of 62-360 and 1 255-3 707, respectively. The model predicts the experimental data fairly well with a mean absolute error of 26.8%. Besides, the model was also evaluated against the experimental data of rectangular channels (40 mm×1.07 mm, 40 mm×2.45 mm) and circular channel (D_e=4 mm) from Mishima and Cheng, et al., respectively, and has a mean absolute error of 34.9%, further showing fairly good applicability of the model.