A boiling two-phase flow heat transfer experimental system for ammonia in a horizontal smooth tube with an inner diameter of 3 mm was established. The purpose is to explore the characteristics of flow boiling and dryout phenomenon. The experimental conditions: heat flux density is 10–30 $kW·m^{-2}$, the mass flux is 40–200 $kg·m^{-2}·s^{-1}$, the saturation temperature is −10–10 °C, and the range of vapor quality is 0.1–1. The results show that the dominant heat transfer in different flow patterns is different, intermittent flow with nucleate boiling, annular flow and mist flow with convective boiling; the increase of mass flux can reinforce the convective boiling, the heat flux density can enhance the nucleate boiling, the increase of saturation temperature has no significant effect on the nucleate boiling, but it can weaken the convective boiling. The increase of mass flux and heat flux density will increase the friction pressure drop, and the increase of saturation temperature can decrease the friction pressure drop. The dryout visualization results and attenuation of heat transfer show that the increase of saturation temperature, heat flux density and mass flux can decrease the initial vapor quality of dryout, which is consistent with the results of Mori et al. model. Compared with the experimental data, the existing two-phase flow correlations are not suitable for the post-dryout prediction for ammonia, and the Wojtan et al. model and Mori et al. model can provide a reference for the dryout prediction.

建立了内径为3 mm的水平光滑管中氨的沸腾两相流传热实验系统。目的是探讨流动沸腾和干涸现象的特点。实验条件：热流密度为10-30$克宽·{米}^{-2}$, 质量通量为 40–200 $克G·{米}^{-2}·{秒}^{-1}$，饱和温度为-10-10°C，蒸汽质量范围为0.1-1。结果表明，不同流型下的主导传热不同，有核沸腾的间歇流、环状流和对流沸腾的雾流；质量通量的增加可以加强对流沸腾，热流密度可以增强核沸腾，饱和温度的升高对核沸腾没有显着影响，但可以减弱对流沸腾。质量通量和热通量密度的增加会增加摩擦压降，饱和温度的升高可以减小摩擦压降。干燥可视化结果和传热衰减表明，饱和温度升高，热通量密度和质量通量可以降低干涸的初始蒸汽质量，这与 Mori 等人的结果一致。模型。与实验数据相比，现有的两相流相关性不适用于氨的干后预测，Wojtan 等人。模型和 Mori 等人。模型可为干涸预测提供参考。