采用汽泡边界层的形成和长大、造成近壁区汽泡雍塞， 从而阻碍汽泡层和主流区的湍流交换的机理， 建立了圆管中低含汽率临界热流密度（ＣＨＦ） 的预测理论模型。经过与Ｔｈｏｍｐｓｏｎ 和ＭａｃＢｅｔｈ的ＣＨＦ 数据库比较， 表明在圆管内中低含汽率工况下， 预测结果和实验数据符合得较好， 本文所提出的模型可用于圆管内中低含汽率工况下ＣＨＦ 值的预测。 The mechanism of the turbulent exchange between the bubble layer and the main flow area is hindered by the formation and growth of the bubble boundary layer, which results in the collapse of the bubble in the near-wall area, and the critical heat flux density (CHF) Prediction theory model. Compared with the CHF database of Thompson and MacBeth, the results show that the prediction results are in good agreement with the experimental data under the conditions of medium and low gas content in the tube. The model proposed in this paper can be used in the medium-low-v Prediction of CHF values.