近临界压力区Post-dryout传热特性分析

Analysis of Post-dryout Heat Transfer at Near Critical Pressure Region

由于临界热流密度后(Post-CHF)传热区气相传热特性较差,加热壁面将会面临显著的温度升高甚至会被烧毁,因此对于Post-CHF区传热特性的研究尤为重要。为对现有临界后传热模型进行评估和改进,整理出现有均匀加热竖直圆管内向上流动Post-dryout区传热数据库。基于此数据库,对近临界压力区Post-dryout传热现象进行分析,提出新的传热关系式。本文所提出的新的传热关系式对现有数据库的预测平均误差为0.9%,均方根误差为14.4%,优于其他模型。

In the Post-CHF region,the poor heat transport properties of the vapor may lead to temperature increase,even severe damage of the heating surface.Hence,it is of great importance to analyze Post-CHF region heat transfer characteristics.To assess existing models and make some improvement,a Post-dryout region heat transfer database with uniformly heated vertical upwards flow tubes was established.Based on this database,the analysis of Post-dryout region at near critical pressure region was launched and a new Post-dryout heat transfer correlation was proposed.The new heat transfer correlation predicts the database with average error of 0.9%and root mean square error of 14.4%,which performs better than other models.