矩形通道内蒸汽射流凝结换热面积的实验研究

To investigate the steam jet condensation phenomenon in a two-phase flow steam injector, a visualized experimental study in a rectangular mix chamber was carried out when the steam mass flux, water mass flux and water temperature were in the range of 200-600 kg·m^-2·s^-1, 4-18 t·m^-2·s^-1 and 20-50 ℃, respectively. With a thermal equilibrium phase change model, the interfacial heat transfer area of steam jet condensation was calculated, and its change with the above parameters was investigated. Besides, an experimental correlation for predicting the dimensionless heat transfer area was established. The results indicate that the cross section shape of the steam nozzle has little influence on the structure of condensation flow field, and the two-phase region in the flow field is the dominant area for steam condensation, where the steam phase transfers energy to subcooled water in the form of steam bubbles. The interfacial heat transfer area increases with the steam mass flux and water temperature, while decreases with the water mass flux, in the range of 2.4×10^-3-7.8×10^-3 m². The errors of heat transfer area between the prediction from the correlation and experimental values are within ±10%. This study may provide a reference for design and safe operation of two-phase flow steam injectors.