A new model for droplet size prediction in horizontal pipes under stratified and annular flow is presented. The developed model takes into account the effects of the gas velocity, liquid velocity, pipe diameter, and developing length on the droplet size. Four experimental databases of droplet size in air-water horizontal flow under atmospheric pressure were used in the model development. The experimental flow conditions of the database covered a pipe diameter range of 2.45–24 cm, and gas and liquid Reynolds numbers ranges of 50,519–582,524 and 526–14,728, respectively. Droplet size experimental results were predicted by the proposed model with a root-mean-square error of 19.4% under stratified flow conditions, and 7.8% under annular flow conditions. Finally, the applicability of the suggested model was confirmed by benchmark calculations with SPACE code, a best-estimated safety analysis code for nuclear power plants, with experimental droplet parameters under various flow conditions.

提出了一种新的分层和环形流下水平管道液滴尺寸预测模型。开发的模型考虑了气体速度、液体速度、管道直径和发展长度对液滴尺寸的影响。在模型开发中使用了四个大气压力下空气-水水平流中液滴尺寸的实验数据库。该数据库的实验流动条件涵盖了管道直径范围为 2.45-24 cm，气体和液体雷诺数范围分别为 50,519-582,524 和 526-14,728。所提出的模型预测液滴尺寸实验结果，分层流条件下的均方根误差为 19.4%，环流条件下为 7.8%。最后，