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本文在压力P=19.0～22.5 MPa、质量流速G=600～1000 kg/(m~2s)、内壁热流密度q=300～500 kW/m~2的参数范围内,对水在新型垂直上升内螺纹管内的传热特性进行了实验研究。研究发现,在近临界压力区,内螺纹管的内壁温随质量流速的增加而降低,随热流密度的增大而升高。在本文研究参数范围内,近临界压力区的水在内螺纹管内传热时并未出现明显的传热恶化。通过实验数据的对比发现,近临界压力区的亚临界压力部分水的传热特性与超临界压力部分水的传热特性具有相似性。
In the range of parameters P = 19.0 ~ 22.5 MPa, mass flow rate G = 600 ~ 1000 kg / (m ~ 2s) and inner wall heat flux q = 300 ~ 500 kW / m ~ 2, The heat transfer characteristics in the threaded tube were studied experimentally. The results show that in the near critical pressure zone, the inner wall temperature of the internally threaded tube decreases with the increase of the mass flow rate, and increases with the increase of the heat flux. In the research parameters of this paper, there is no obvious heat transfer deterioration in the near-critical pressure zone when heat transfer in the female pipe. Comparing the experimental data, it is found that the heat transfer characteristics of the sub-critical pressure water in the near-critical pressure region have similarities with the heat transfer characteristics of the supercritical pressure water.