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中文摘要：
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（De＝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。
英文摘要：
A calculation model of slug length was developed for slug flow in small chan-nels 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 （De = 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 .
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