报导了在西安交通大学高压汽水实验回路上进行的垂直螺旋管内汽水两相流传热试验研究．试验得出了沿螺旋管长度方向及圆周方向的壁温分布特性，由此确定了发生传热恶化的临界干度及其位置．在试验数据的基础上，得到了计算临界干度的经验公式，为螺旋管圈换热设备的设计提供了必要的依据． Reported on the Xi’an Jiaotong University high-pressure steam test loop carried out in the vertical spiral tube of water vapor two-phase heat transfer test study. The experimental results show the distribution of wall temperature along the length and the circumferential direction of the spiral tube, thus determining the critical dryness and location of the deterioration of heat transfer. Based on the experimental data, the empirical formula for calculating the critical dryness is obtained, which provides the necessary basis for the design of spiral pipe heat exchange equipment.