超临界流体管内对流换热模化分析

摘要

Based on the experimental database of convective heat transfer in tube at supercritical pressure ,different scaling law s for supercritical heat transfer w ere studied . A modified Cheng et al .’s scaling law was proposed and validated via experimental data . The results show that the modified Cheng et al .’s scaling law has a higher degree of ac‐curacy ,while adopting the exponents of Zhou Qiangtai’s correlation and average prop‐erties in Prandtl number ,and heat transfer scalings of different supercritical fluids agree w ell .%在超临界流体管内对流换热数据库的基础上，对近年来针对超临界流体管内换热的不同模化方法进行分析，提出了修正的Cheng等模化准则，并进行实验数据验证。结果表明：采用周强泰的传热关系式中的指数，并取平均性质的普朗特数后，得到的修正的Cheng等模化准则精度更高，不同超临界流体间传热的模化符合较好。